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2404 lines
90 KiB
Plaintext
2404 lines
90 KiB
Plaintext
@chapter Muxers
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@c man begin MUXERS
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Muxers are configured elements in FFmpeg which allow writing
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multimedia streams to a particular type of file.
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When you configure your FFmpeg build, all the supported muxers
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are enabled by default. You can list all available muxers using the
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configure option @code{--list-muxers}.
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You can disable all the muxers with the configure option
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@code{--disable-muxers} and selectively enable / disable single muxers
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with the options @code{--enable-muxer=@var{MUXER}} /
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@code{--disable-muxer=@var{MUXER}}.
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The option @code{-muxers} of the ff* tools will display the list of
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enabled muxers. Use @code{-formats} to view a combined list of
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enabled demuxers and muxers.
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A description of some of the currently available muxers follows.
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@anchor{aiff}
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@section aiff
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Audio Interchange File Format muxer.
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@subsection Options
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It accepts the following options:
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@table @option
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@item write_id3v2
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Enable ID3v2 tags writing when set to 1. Default is 0 (disabled).
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@item id3v2_version
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Select ID3v2 version to write. Currently only version 3 and 4 (aka.
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ID3v2.3 and ID3v2.4) are supported. The default is version 4.
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@end table
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@anchor{asf}
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@section asf
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Advanced Systems Format muxer.
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Note that Windows Media Audio (wma) and Windows Media Video (wmv) use this
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muxer too.
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@subsection Options
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It accepts the following options:
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@table @option
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@item packet_size
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Set the muxer packet size. By tuning this setting you may reduce data
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fragmentation or muxer overhead depending on your source. Default value is
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3200, minimum is 100, maximum is 64k.
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@end table
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@anchor{avi}
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@section avi
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Audio Video Interleaved muxer.
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@subsection Options
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It accepts the following options:
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@table @option
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@item reserve_index_space
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Reserve the specified amount of bytes for the OpenDML master index of each
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stream within the file header. By default additional master indexes are
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embedded within the data packets if there is no space left in the first master
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index and are linked together as a chain of indexes. This index structure can
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cause problems for some use cases, e.g. third-party software strictly relying
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on the OpenDML index specification or when file seeking is slow. Reserving
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enough index space in the file header avoids these problems.
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The required index space depends on the output file size and should be about 16
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bytes per gigabyte. When this option is omitted or set to zero the necessary
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index space is guessed.
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@item write_channel_mask
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Write the channel layout mask into the audio stream header.
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This option is enabled by default. Disabling the channel mask can be useful in
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specific scenarios, e.g. when merging multiple audio streams into one for
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compatibility with software that only supports a single audio stream in AVI
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(see @ref{amerge,,the "amerge" section in the ffmpeg-filters manual,ffmpeg-filters}).
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@end table
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@anchor{chromaprint}
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@section chromaprint
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Chromaprint fingerprinter.
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This muxer feeds audio data to the Chromaprint library,
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which generates a fingerprint for the provided audio data. See @url{https://acoustid.org/chromaprint}
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It takes a single signed native-endian 16-bit raw audio stream of at most 2 channels.
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@subsection Options
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@table @option
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@item silence_threshold
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Threshold for detecting silence, ranges from -1 to 32767. -1 disables silence detection and
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is required for use with the AcoustID service. Default is -1.
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@item algorithm
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Version of algorithm to fingerprint with. Range is 0 to 4. Version 2 requires that silence
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detection be enabled. Default is 1.
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@item fp_format
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Format to output the fingerprint as. Accepts the following options:
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@table @samp
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@item raw
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Binary raw fingerprint
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@item compressed
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Binary compressed fingerprint
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@item base64
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Base64 compressed fingerprint @emph{(default)}
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@end table
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@end table
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@anchor{crc}
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@section crc
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CRC (Cyclic Redundancy Check) testing format.
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This muxer computes and prints the Adler-32 CRC of all the input audio
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and video frames. By default audio frames are converted to signed
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16-bit raw audio and video frames to raw video before computing the
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CRC.
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The output of the muxer consists of a single line of the form:
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CRC=0x@var{CRC}, where @var{CRC} is a hexadecimal number 0-padded to
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8 digits containing the CRC for all the decoded input frames.
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See also the @ref{framecrc} muxer.
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@subsection Examples
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For example to compute the CRC of the input, and store it in the file
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@file{out.crc}:
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@example
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ffmpeg -i INPUT -f crc out.crc
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@end example
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You can print the CRC to stdout with the command:
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@example
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ffmpeg -i INPUT -f crc -
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@end example
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You can select the output format of each frame with @command{ffmpeg} by
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specifying the audio and video codec and format. For example to
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compute the CRC of the input audio converted to PCM unsigned 8-bit
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and the input video converted to MPEG-2 video, use the command:
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@example
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ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f crc -
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@end example
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@section flv
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Adobe Flash Video Format muxer.
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This muxer accepts the following options:
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@table @option
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@item flvflags @var{flags}
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Possible values:
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@table @samp
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@item aac_seq_header_detect
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Place AAC sequence header based on audio stream data.
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@item no_sequence_end
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Disable sequence end tag.
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@item no_metadata
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Disable metadata tag.
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@item no_duration_filesize
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Disable duration and filesize in metadata when they are equal to zero
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at the end of stream. (Be used to non-seekable living stream).
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@item add_keyframe_index
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Used to facilitate seeking; particularly for HTTP pseudo streaming.
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@end table
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@end table
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@anchor{dash}
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@section dash
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Dynamic Adaptive Streaming over HTTP (DASH) muxer that creates segments
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and manifest files according to the MPEG-DASH standard ISO/IEC 23009-1:2014.
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For more information see:
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@itemize @bullet
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@item
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ISO DASH Specification: @url{http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip}
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@item
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WebM DASH Specification: @url{https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification}
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@end itemize
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It creates a MPD manifest file and segment files for each stream.
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The segment filename might contain pre-defined identifiers used with SegmentTemplate
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as defined in section 5.3.9.4.4 of the standard. Available identifiers are "$RepresentationID$",
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"$Number$", "$Bandwidth$" and "$Time$".
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In addition to the standard identifiers, an ffmpeg-specific "$ext$" identifier is also supported.
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When specified ffmpeg will replace $ext$ in the file name with muxing format's extensions such as mp4, webm etc.,
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@example
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ffmpeg -re -i <input> -map 0 -map 0 -c:a libfdk_aac -c:v libx264 \
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-b:v:0 800k -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline \
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-profile:v:0 main -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \
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-b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \
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-window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" \
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-f dash /path/to/out.mpd
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@end example
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@table @option
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@item min_seg_duration @var{microseconds}
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This is a deprecated option to set the segment length in microseconds, use @var{seg_duration} instead.
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@item seg_duration @var{duration}
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Set the segment length in seconds (fractional value can be set). The value is
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treated as average segment duration when @var{use_template} is enabled and
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@var{use_timeline} is disabled and as minimum segment duration for all the other
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use cases.
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@item window_size @var{size}
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Set the maximum number of segments kept in the manifest.
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@item extra_window_size @var{size}
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Set the maximum number of segments kept outside of the manifest before removing from disk.
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@item remove_at_exit @var{remove}
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Enable (1) or disable (0) removal of all segments when finished.
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@item use_template @var{template}
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Enable (1) or disable (0) use of SegmentTemplate instead of SegmentList.
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@item use_timeline @var{timeline}
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Enable (1) or disable (0) use of SegmentTimeline in SegmentTemplate.
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@item single_file @var{single_file}
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Enable (1) or disable (0) storing all segments in one file, accessed using byte ranges.
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@item single_file_name @var{file_name}
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DASH-templated name to be used for baseURL. Implies @var{single_file} set to "1". In the template, "$ext$" is replaced with the file name extension specific for the segment format.
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@item init_seg_name @var{init_name}
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DASH-templated name to used for the initialization segment. Default is "init-stream$RepresentationID$.$ext$". "$ext$" is replaced with the file name extension specific for the segment format.
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@item media_seg_name @var{segment_name}
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DASH-templated name to used for the media segments. Default is "chunk-stream$RepresentationID$-$Number%05d$.$ext$". "$ext$" is replaced with the file name extension specific for the segment format.
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@item utc_timing_url @var{utc_url}
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URL of the page that will return the UTC timestamp in ISO format. Example: "https://time.akamai.com/?iso"
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@item method @var{method}
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Use the given HTTP method to create output files. Generally set to PUT or POST.
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@item http_user_agent @var{user_agent}
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Override User-Agent field in HTTP header. Applicable only for HTTP output.
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@item http_persistent @var{http_persistent}
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Use persistent HTTP connections. Applicable only for HTTP output.
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@item hls_playlist @var{hls_playlist}
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Generate HLS playlist files as well. The master playlist is generated with the filename master.m3u8.
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One media playlist file is generated for each stream with filenames media_0.m3u8, media_1.m3u8, etc.
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@item streaming @var{streaming}
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Enable (1) or disable (0) chunk streaming mode of output. In chunk streaming
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mode, each frame will be a moof fragment which forms a chunk.
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@item adaptation_sets @var{adaptation_sets}
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Assign streams to AdaptationSets. Syntax is "id=x,streams=a,b,c id=y,streams=d,e" with x and y being the IDs
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of the adaptation sets and a,b,c,d and e are the indices of the mapped streams.
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To map all video (or audio) streams to an AdaptationSet, "v" (or "a") can be used as stream identifier instead of IDs.
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When no assignment is defined, this defaults to an AdaptationSet for each stream.
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Optional syntax is "id=x,descriptor=descriptor_string,streams=a,b,c id=y,streams=d,e" and so on, descriptor is useful to the scheme defined by ISO/IEC 23009-1:2014/Amd.2:2015.
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For example, -adaptation_sets "id=0,descriptor=<SupplementalProperty schemeIdUri=\"urn:mpeg:dash:srd:2014\" value=\"0,0,0,1,1,2,2\"/>,streams=v".
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Please note that descriptor string should be a self-closing xml tag.
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@item timeout @var{timeout}
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Set timeout for socket I/O operations. Applicable only for HTTP output.
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@item index_correction @var{index_correction}
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Enable (1) or Disable (0) segment index correction logic. Applicable only when
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@var{use_template} is enabled and @var{use_timeline} is disabled.
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When enabled, the logic monitors the flow of segment indexes. If a streams's
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segment index value is not at the expected real time position, then the logic
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corrects that index value.
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Typically this logic is needed in live streaming use cases. The network bandwidth
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fluctuations are common during long run streaming. Each fluctuation can cause
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the segment indexes fall behind the expected real time position.
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@item format_options @var{options_list}
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Set container format (mp4/webm) options using a @code{:} separated list of
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key=value parameters. Values containing @code{:} special characters must be
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escaped.
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@item global_sidx @var{global_sidx}
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Write global SIDX atom. Applicable only for single file, mp4 output, non-streaming mode.
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@item dash_segment_type @var{dash_segment_type}
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Possible values:
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@table @option
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@item auto
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If this flag is set, the dash segment files format will be selected based on the stream codec. This is the default mode.
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@item mp4
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If this flag is set, the dash segment files will be in in ISOBMFF format.
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@item webm
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If this flag is set, the dash segment files will be in in WebM format.
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@end table
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@item ignore_io_errors @var{ignore_io_errors}
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Ignore IO errors during open and write. Useful for long-duration runs with network output.
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@item lhls @var{lhls}
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Enable Low-latency HLS(LHLS). Adds #EXT-X-PREFETCH tag with current segment's URI.
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Apple doesn't have an official spec for LHLS. Meanwhile hls.js player folks are
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trying to standardize a open LHLS spec. The draft spec is available in https://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md
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This option will also try to comply with the above open spec, till Apple's spec officially supports it.
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Applicable only when @var{streaming} and @var{hls_playlist} options are enabled.
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This is an experimental feature.
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@item master_m3u8_publish_rate @var{master_m3u8_publish_rate}
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Publish master playlist repeatedly every after specified number of segment intervals.
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@end table
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@anchor{framecrc}
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@section framecrc
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Per-packet CRC (Cyclic Redundancy Check) testing format.
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This muxer computes and prints the Adler-32 CRC for each audio
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and video packet. By default audio frames are converted to signed
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16-bit raw audio and video frames to raw video before computing the
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CRC.
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The output of the muxer consists of a line for each audio and video
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packet of the form:
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@example
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@var{stream_index}, @var{packet_dts}, @var{packet_pts}, @var{packet_duration}, @var{packet_size}, 0x@var{CRC}
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@end example
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@var{CRC} is a hexadecimal number 0-padded to 8 digits containing the
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CRC of the packet.
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@subsection Examples
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For example to compute the CRC of the audio and video frames in
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@file{INPUT}, converted to raw audio and video packets, and store it
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in the file @file{out.crc}:
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@example
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ffmpeg -i INPUT -f framecrc out.crc
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@end example
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To print the information to stdout, use the command:
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@example
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ffmpeg -i INPUT -f framecrc -
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@end example
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With @command{ffmpeg}, you can select the output format to which the
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audio and video frames are encoded before computing the CRC for each
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packet by specifying the audio and video codec. For example, to
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compute the CRC of each decoded input audio frame converted to PCM
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unsigned 8-bit and of each decoded input video frame converted to
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MPEG-2 video, use the command:
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@example
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ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
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@end example
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See also the @ref{crc} muxer.
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@anchor{framehash}
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@section framehash
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Per-packet hash testing format.
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This muxer computes and prints a cryptographic hash for each audio
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and video packet. This can be used for packet-by-packet equality
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checks without having to individually do a binary comparison on each.
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By default audio frames are converted to signed 16-bit raw audio and
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video frames to raw video before computing the hash, but the output
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of explicit conversions to other codecs can also be used. It uses the
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SHA-256 cryptographic hash function by default, but supports several
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other algorithms.
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The output of the muxer consists of a line for each audio and video
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packet of the form:
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@example
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@var{stream_index}, @var{packet_dts}, @var{packet_pts}, @var{packet_duration}, @var{packet_size}, @var{hash}
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@end example
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@var{hash} is a hexadecimal number representing the computed hash
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for the packet.
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@table @option
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@item hash @var{algorithm}
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Use the cryptographic hash function specified by the string @var{algorithm}.
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Supported values include @code{MD5}, @code{murmur3}, @code{RIPEMD128},
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@code{RIPEMD160}, @code{RIPEMD256}, @code{RIPEMD320}, @code{SHA160},
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@code{SHA224}, @code{SHA256} (default), @code{SHA512/224}, @code{SHA512/256},
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@code{SHA384}, @code{SHA512}, @code{CRC32} and @code{adler32}.
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@end table
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@subsection Examples
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To compute the SHA-256 hash of the audio and video frames in @file{INPUT},
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converted to raw audio and video packets, and store it in the file
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@file{out.sha256}:
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@example
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ffmpeg -i INPUT -f framehash out.sha256
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@end example
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To print the information to stdout, using the MD5 hash function, use
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the command:
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@example
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ffmpeg -i INPUT -f framehash -hash md5 -
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@end example
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See also the @ref{hash} muxer.
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@anchor{framemd5}
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@section framemd5
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Per-packet MD5 testing format.
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This is a variant of the @ref{framehash} muxer. Unlike that muxer,
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it defaults to using the MD5 hash function.
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@subsection Examples
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To compute the MD5 hash of the audio and video frames in @file{INPUT},
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converted to raw audio and video packets, and store it in the file
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@file{out.md5}:
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@example
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ffmpeg -i INPUT -f framemd5 out.md5
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@end example
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To print the information to stdout, use the command:
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@example
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ffmpeg -i INPUT -f framemd5 -
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@end example
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See also the @ref{framehash} and @ref{md5} muxers.
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@anchor{gif}
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@section gif
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Animated GIF muxer.
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It accepts the following options:
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@table @option
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@item loop
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Set the number of times to loop the output. Use @code{-1} for no loop, @code{0}
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for looping indefinitely (default).
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@item final_delay
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Force the delay (expressed in centiseconds) after the last frame. Each frame
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ends with a delay until the next frame. The default is @code{-1}, which is a
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special value to tell the muxer to re-use the previous delay. In case of a
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loop, you might want to customize this value to mark a pause for instance.
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@end table
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For example, to encode a gif looping 10 times, with a 5 seconds delay between
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the loops:
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@example
|
|
ffmpeg -i INPUT -loop 10 -final_delay 500 out.gif
|
|
@end example
|
|
|
|
Note 1: if you wish to extract the frames into separate GIF files, you need to
|
|
force the @ref{image2} muxer:
|
|
@example
|
|
ffmpeg -i INPUT -c:v gif -f image2 "out%d.gif"
|
|
@end example
|
|
|
|
Note 2: the GIF format has a very large time base: the delay between two frames
|
|
can therefore not be smaller than one centi second.
|
|
|
|
@anchor{hash}
|
|
@section hash
|
|
|
|
Hash testing format.
|
|
|
|
This muxer computes and prints a cryptographic hash of all the input
|
|
audio and video frames. This can be used for equality checks without
|
|
having to do a complete binary comparison.
|
|
|
|
By default audio frames are converted to signed 16-bit raw audio and
|
|
video frames to raw video before computing the hash, but the output
|
|
of explicit conversions to other codecs can also be used. Timestamps
|
|
are ignored. It uses the SHA-256 cryptographic hash function by default,
|
|
but supports several other algorithms.
|
|
|
|
The output of the muxer consists of a single line of the form:
|
|
@var{algo}=@var{hash}, where @var{algo} is a short string representing
|
|
the hash function used, and @var{hash} is a hexadecimal number
|
|
representing the computed hash.
|
|
|
|
@table @option
|
|
@item hash @var{algorithm}
|
|
Use the cryptographic hash function specified by the string @var{algorithm}.
|
|
Supported values include @code{MD5}, @code{murmur3}, @code{RIPEMD128},
|
|
@code{RIPEMD160}, @code{RIPEMD256}, @code{RIPEMD320}, @code{SHA160},
|
|
@code{SHA224}, @code{SHA256} (default), @code{SHA512/224}, @code{SHA512/256},
|
|
@code{SHA384}, @code{SHA512}, @code{CRC32} and @code{adler32}.
|
|
|
|
@end table
|
|
|
|
@subsection Examples
|
|
|
|
To compute the SHA-256 hash of the input converted to raw audio and
|
|
video, and store it in the file @file{out.sha256}:
|
|
@example
|
|
ffmpeg -i INPUT -f hash out.sha256
|
|
@end example
|
|
|
|
To print an MD5 hash to stdout use the command:
|
|
@example
|
|
ffmpeg -i INPUT -f hash -hash md5 -
|
|
@end example
|
|
|
|
See also the @ref{framehash} muxer.
|
|
|
|
@anchor{hls}
|
|
@section hls
|
|
|
|
Apple HTTP Live Streaming muxer that segments MPEG-TS according to
|
|
the HTTP Live Streaming (HLS) specification.
|
|
|
|
It creates a playlist file, and one or more segment files. The output filename
|
|
specifies the playlist filename.
|
|
|
|
By default, the muxer creates a file for each segment produced. These files
|
|
have the same name as the playlist, followed by a sequential number and a
|
|
.ts extension.
|
|
|
|
Make sure to require a closed GOP when encoding and to set the GOP
|
|
size to fit your segment time constraint.
|
|
|
|
For example, to convert an input file with @command{ffmpeg}:
|
|
@example
|
|
ffmpeg -i in.mkv -c:v h264 -flags +cgop -g 30 -hls_time 1 out.m3u8
|
|
@end example
|
|
This example will produce the playlist, @file{out.m3u8}, and segment files:
|
|
@file{out0.ts}, @file{out1.ts}, @file{out2.ts}, etc.
|
|
|
|
See also the @ref{segment} muxer, which provides a more generic and
|
|
flexible implementation of a segmenter, and can be used to perform HLS
|
|
segmentation.
|
|
|
|
@subsection Options
|
|
|
|
This muxer supports the following options:
|
|
|
|
@table @option
|
|
@item hls_init_time @var{seconds}
|
|
Set the initial target segment length in seconds. Default value is @var{0}.
|
|
Segment will be cut on the next key frame after this time has passed on the first m3u8 list.
|
|
After the initial playlist is filled @command{ffmpeg} will cut segments
|
|
at duration equal to @code{hls_time}
|
|
|
|
@item hls_time @var{seconds}
|
|
Set the target segment length in seconds. Default value is 2.
|
|
Segment will be cut on the next key frame after this time has passed.
|
|
|
|
@item hls_list_size @var{size}
|
|
Set the maximum number of playlist entries. If set to 0 the list file
|
|
will contain all the segments. Default value is 5.
|
|
|
|
@item hls_delete_threshold @var{size}
|
|
Set the number of unreferenced segments to keep on disk before @code{hls_flags delete_segments}
|
|
deletes them. Increase this to allow continue clients to download segments which
|
|
were recently referenced in the playlist. Default value is 1, meaning segments older than
|
|
@code{hls_list_size+1} will be deleted.
|
|
|
|
@item hls_ts_options @var{options_list}
|
|
Set output format options using a :-separated list of key=value
|
|
parameters. Values containing @code{:} special characters must be
|
|
escaped.
|
|
|
|
@item hls_wrap @var{wrap}
|
|
This is a deprecated option, you can use @code{hls_list_size}
|
|
and @code{hls_flags delete_segments} instead it
|
|
|
|
This option is useful to avoid to fill the disk with many segment
|
|
files, and limits the maximum number of segment files written to disk
|
|
to @var{wrap}.
|
|
|
|
|
|
@item hls_start_number_source
|
|
Start the playlist sequence number (@code{#EXT-X-MEDIA-SEQUENCE}) according to the specified source.
|
|
Unless @code{hls_flags single_file} is set, it also specifies source of starting sequence numbers of
|
|
segment and subtitle filenames. In any case, if @code{hls_flags append_list}
|
|
is set and read playlist sequence number is greater than the specified start sequence number,
|
|
then that value will be used as start value.
|
|
|
|
It accepts the following values:
|
|
|
|
@table @option
|
|
|
|
@item generic (default)
|
|
Set the starting sequence numbers according to @var{start_number} option value.
|
|
|
|
@item epoch
|
|
The start number will be the seconds since epoch (1970-01-01 00:00:00)
|
|
|
|
@item datetime
|
|
The start number will be based on the current date/time as YYYYmmddHHMMSS. e.g. 20161231235759.
|
|
|
|
@end table
|
|
|
|
@item start_number @var{number}
|
|
Start the playlist sequence number (@code{#EXT-X-MEDIA-SEQUENCE}) from the specified @var{number}
|
|
when @var{hls_start_number_source} value is @var{generic}. (This is the default case.)
|
|
Unless @code{hls_flags single_file} is set, it also specifies starting sequence numbers of segment and subtitle filenames.
|
|
Default value is 0.
|
|
|
|
@item hls_allow_cache @var{allowcache}
|
|
Explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments.
|
|
|
|
@item hls_base_url @var{baseurl}
|
|
Append @var{baseurl} to every entry in the playlist.
|
|
Useful to generate playlists with absolute paths.
|
|
|
|
Note that the playlist sequence number must be unique for each segment
|
|
and it is not to be confused with the segment filename sequence number
|
|
which can be cyclic, for example if the @option{wrap} option is
|
|
specified.
|
|
|
|
@item hls_segment_filename @var{filename}
|
|
Set the segment filename. Unless @code{hls_flags single_file} is set,
|
|
@var{filename} is used as a string format with the segment number:
|
|
@example
|
|
ffmpeg -i in.nut -hls_segment_filename 'file%03d.ts' out.m3u8
|
|
@end example
|
|
This example will produce the playlist, @file{out.m3u8}, and segment files:
|
|
@file{file000.ts}, @file{file001.ts}, @file{file002.ts}, etc.
|
|
|
|
@var{filename} may contain full path or relative path specification,
|
|
but only the file name part without any path info will be contained in the m3u8 segment list.
|
|
Should a relative path be specified, the path of the created segment
|
|
files will be relative to the current working directory.
|
|
When strftime_mkdir is set, the whole expanded value of @var{filename} will be written into the m3u8 segment list.
|
|
|
|
When @code{var_stream_map} is set with two or more variant streams, the
|
|
@var{filename} pattern must contain the string "%v", this string specifies
|
|
the position of variant stream index in the generated segment file names.
|
|
@example
|
|
ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
-hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8
|
|
@end example
|
|
This example will produce the playlists segment file sets:
|
|
@file{file_0_000.ts}, @file{file_0_001.ts}, @file{file_0_002.ts}, etc. and
|
|
@file{file_1_000.ts}, @file{file_1_001.ts}, @file{file_1_002.ts}, etc.
|
|
|
|
The string "%v" may be present in the filename or in the last directory name
|
|
containing the file, but only in one of them. (Additionally, %v may appear multiple times in the last
|
|
sub-directory or filename.) If the string %v is present in the directory name, then
|
|
sub-directories are created after expanding the directory name pattern. This
|
|
enables creation of segments corresponding to different variant streams in
|
|
subdirectories.
|
|
@example
|
|
ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
-hls_segment_filename 'vs%v/file_%03d.ts' vs%v/out.m3u8
|
|
@end example
|
|
This example will produce the playlists segment file sets:
|
|
@file{vs0/file_000.ts}, @file{vs0/file_001.ts}, @file{vs0/file_002.ts}, etc. and
|
|
@file{vs1/file_000.ts}, @file{vs1/file_001.ts}, @file{vs1/file_002.ts}, etc.
|
|
|
|
@item use_localtime
|
|
Same as strftime option, will be deprecated.
|
|
|
|
@item strftime
|
|
Use strftime() on @var{filename} to expand the segment filename with localtime.
|
|
The segment number is also available in this mode, but to use it, you need to specify second_level_segment_index
|
|
hls_flag and %%d will be the specifier.
|
|
@example
|
|
ffmpeg -i in.nut -strftime 1 -hls_segment_filename 'file-%Y%m%d-%s.ts' out.m3u8
|
|
@end example
|
|
This example will produce the playlist, @file{out.m3u8}, and segment files:
|
|
@file{file-20160215-1455569023.ts}, @file{file-20160215-1455569024.ts}, etc.
|
|
Note: On some systems/environments, the @code{%s} specifier is not available. See
|
|
@code{strftime()} documentation.
|
|
@example
|
|
ffmpeg -i in.nut -strftime 1 -hls_flags second_level_segment_index -hls_segment_filename 'file-%Y%m%d-%%04d.ts' out.m3u8
|
|
@end example
|
|
This example will produce the playlist, @file{out.m3u8}, and segment files:
|
|
@file{file-20160215-0001.ts}, @file{file-20160215-0002.ts}, etc.
|
|
|
|
@item use_localtime_mkdir
|
|
Same as strftime_mkdir option, will be deprecated .
|
|
|
|
@item strftime_mkdir
|
|
Used together with -strftime_mkdir, it will create all subdirectories which
|
|
is expanded in @var{filename}.
|
|
@example
|
|
ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8
|
|
@end example
|
|
This example will create a directory 201560215 (if it does not exist), and then
|
|
produce the playlist, @file{out.m3u8}, and segment files:
|
|
@file{20160215/file-20160215-1455569023.ts}, @file{20160215/file-20160215-1455569024.ts}, etc.
|
|
|
|
@example
|
|
ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8
|
|
@end example
|
|
This example will create a directory hierarchy 2016/02/15 (if any of them do not exist), and then
|
|
produce the playlist, @file{out.m3u8}, and segment files:
|
|
@file{2016/02/15/file-20160215-1455569023.ts}, @file{2016/02/15/file-20160215-1455569024.ts}, etc.
|
|
|
|
|
|
@item hls_key_info_file @var{key_info_file}
|
|
Use the information in @var{key_info_file} for segment encryption. The first
|
|
line of @var{key_info_file} specifies the key URI written to the playlist. The
|
|
key URL is used to access the encryption key during playback. The second line
|
|
specifies the path to the key file used to obtain the key during the encryption
|
|
process. The key file is read as a single packed array of 16 octets in binary
|
|
format. The optional third line specifies the initialization vector (IV) as a
|
|
hexadecimal string to be used instead of the segment sequence number (default)
|
|
for encryption. Changes to @var{key_info_file} will result in segment
|
|
encryption with the new key/IV and an entry in the playlist for the new key
|
|
URI/IV if @code{hls_flags periodic_rekey} is enabled.
|
|
|
|
Key info file format:
|
|
@example
|
|
@var{key URI}
|
|
@var{key file path}
|
|
@var{IV} (optional)
|
|
@end example
|
|
|
|
Example key URIs:
|
|
@example
|
|
http://server/file.key
|
|
/path/to/file.key
|
|
file.key
|
|
@end example
|
|
|
|
Example key file paths:
|
|
@example
|
|
file.key
|
|
/path/to/file.key
|
|
@end example
|
|
|
|
Example IV:
|
|
@example
|
|
0123456789ABCDEF0123456789ABCDEF
|
|
@end example
|
|
|
|
Key info file example:
|
|
@example
|
|
http://server/file.key
|
|
/path/to/file.key
|
|
0123456789ABCDEF0123456789ABCDEF
|
|
@end example
|
|
|
|
Example shell script:
|
|
@example
|
|
#!/bin/sh
|
|
BASE_URL=$@{1:-'.'@}
|
|
openssl rand 16 > file.key
|
|
echo $BASE_URL/file.key > file.keyinfo
|
|
echo file.key >> file.keyinfo
|
|
echo $(openssl rand -hex 16) >> file.keyinfo
|
|
ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
|
|
-hls_key_info_file file.keyinfo out.m3u8
|
|
@end example
|
|
|
|
@item -hls_enc @var{enc}
|
|
Enable (1) or disable (0) the AES128 encryption.
|
|
When enabled every segment generated is encrypted and the encryption key
|
|
is saved as @var{playlist name}.key.
|
|
|
|
@item -hls_enc_key @var{key}
|
|
Hex-coded 16byte key to encrypt the segments, by default it
|
|
is randomly generated.
|
|
|
|
@item -hls_enc_key_url @var{keyurl}
|
|
If set, @var{keyurl} is prepended instead of @var{baseurl} to the key filename
|
|
in the playlist.
|
|
|
|
@item -hls_enc_iv @var{iv}
|
|
Hex-coded 16byte initialization vector for every segment instead
|
|
of the autogenerated ones.
|
|
|
|
@item hls_segment_type @var{flags}
|
|
Possible values:
|
|
|
|
@table @samp
|
|
@item mpegts
|
|
Output segment files in MPEG-2 Transport Stream format. This is
|
|
compatible with all HLS versions.
|
|
|
|
@item fmp4
|
|
Output segment files in fragmented MP4 format, similar to MPEG-DASH.
|
|
fmp4 files may be used in HLS version 7 and above.
|
|
|
|
@end table
|
|
|
|
@item hls_fmp4_init_filename @var{filename}
|
|
Set filename to the fragment files header file, default filename is @file{init.mp4}.
|
|
|
|
When @code{var_stream_map} is set with two or more variant streams, the
|
|
@var{filename} pattern must contain the string "%v", this string specifies
|
|
the position of variant stream index in the generated init file names.
|
|
The string "%v" may be present in the filename or in the last directory name
|
|
containing the file. If the string is present in the directory name, then
|
|
sub-directories are created after expanding the directory name pattern. This
|
|
enables creation of init files corresponding to different variant streams in
|
|
subdirectories.
|
|
|
|
@item hls_flags @var{flags}
|
|
Possible values:
|
|
|
|
@table @samp
|
|
@item single_file
|
|
If this flag is set, the muxer will store all segments in a single MPEG-TS
|
|
file, and will use byte ranges in the playlist. HLS playlists generated with
|
|
this way will have the version number 4.
|
|
For example:
|
|
@example
|
|
ffmpeg -i in.nut -hls_flags single_file out.m3u8
|
|
@end example
|
|
Will produce the playlist, @file{out.m3u8}, and a single segment file,
|
|
@file{out.ts}.
|
|
|
|
@item delete_segments
|
|
Segment files removed from the playlist are deleted after a period of time
|
|
equal to the duration of the segment plus the duration of the playlist.
|
|
|
|
@item append_list
|
|
Append new segments into the end of old segment list,
|
|
and remove the @code{#EXT-X-ENDLIST} from the old segment list.
|
|
|
|
@item round_durations
|
|
Round the duration info in the playlist file segment info to integer
|
|
values, instead of using floating point.
|
|
|
|
@item discont_start
|
|
Add the @code{#EXT-X-DISCONTINUITY} tag to the playlist, before the
|
|
first segment's information.
|
|
|
|
@item omit_endlist
|
|
Do not append the @code{EXT-X-ENDLIST} tag at the end of the playlist.
|
|
|
|
@item periodic_rekey
|
|
The file specified by @code{hls_key_info_file} will be checked periodically and
|
|
detect updates to the encryption info. Be sure to replace this file atomically,
|
|
including the file containing the AES encryption key.
|
|
|
|
@item independent_segments
|
|
Add the @code{#EXT-X-INDEPENDENT-SEGMENTS} to playlists that has video segments
|
|
and when all the segments of that playlist are guaranteed to start with a Key frame.
|
|
|
|
@item iframes_only
|
|
Add the @code{#EXT-X-I-FRAMES-ONLY} to playlists that has video segments
|
|
and can play only I-frames in the @code{#EXT-X-BYTERANGE} mode.
|
|
|
|
@item split_by_time
|
|
Allow segments to start on frames other than keyframes. This improves
|
|
behavior on some players when the time between keyframes is inconsistent,
|
|
but may make things worse on others, and can cause some oddities during
|
|
seeking. This flag should be used with the @code{hls_time} option.
|
|
|
|
@item program_date_time
|
|
Generate @code{EXT-X-PROGRAM-DATE-TIME} tags.
|
|
|
|
@item second_level_segment_index
|
|
Makes it possible to use segment indexes as %%d in hls_segment_filename expression
|
|
besides date/time values when strftime is on.
|
|
To get fixed width numbers with trailing zeroes, %%0xd format is available where x is the required width.
|
|
|
|
@item second_level_segment_size
|
|
Makes it possible to use segment sizes (counted in bytes) as %%s in hls_segment_filename
|
|
expression besides date/time values when strftime is on.
|
|
To get fixed width numbers with trailing zeroes, %%0xs format is available where x is the required width.
|
|
|
|
@item second_level_segment_duration
|
|
Makes it possible to use segment duration (calculated in microseconds) as %%t in hls_segment_filename
|
|
expression besides date/time values when strftime is on.
|
|
To get fixed width numbers with trailing zeroes, %%0xt format is available where x is the required width.
|
|
|
|
@example
|
|
ffmpeg -i sample.mpeg \
|
|
-f hls -hls_time 3 -hls_list_size 5 \
|
|
-hls_flags second_level_segment_index+second_level_segment_size+second_level_segment_duration \
|
|
-strftime 1 -strftime_mkdir 1 -hls_segment_filename "segment_%Y%m%d%H%M%S_%%04d_%%08s_%%013t.ts" stream.m3u8
|
|
@end example
|
|
This will produce segments like this:
|
|
@file{segment_20170102194334_0003_00122200_0000003000000.ts}, @file{segment_20170102194334_0004_00120072_0000003000000.ts} etc.
|
|
|
|
@item temp_file
|
|
Write segment data to filename.tmp and rename to filename only once the segment is complete. A webserver
|
|
serving up segments can be configured to reject requests to *.tmp to prevent access to in-progress segments
|
|
before they have been added to the m3u8 playlist. This flag also affects how m3u8 playlist files are created.
|
|
If this flag is set, all playlist files will written into temporary file and renamed after they are complete, similarly as segments are handled.
|
|
But playlists with @code{file} protocol and with type (@code{hls_playlist_type}) other than @code{vod}
|
|
are always written into temporary file regardless of this flag. Master playlist files (@code{master_pl_name}), if any, with @code{file} protocol,
|
|
are always written into temporary file regardless of this flag if @code{master_pl_publish_rate} value is other than zero.
|
|
|
|
@end table
|
|
|
|
@item hls_playlist_type event
|
|
Emit @code{#EXT-X-PLAYLIST-TYPE:EVENT} in the m3u8 header. Forces
|
|
@option{hls_list_size} to 0; the playlist can only be appended to.
|
|
|
|
@item hls_playlist_type vod
|
|
Emit @code{#EXT-X-PLAYLIST-TYPE:VOD} in the m3u8 header. Forces
|
|
@option{hls_list_size} to 0; the playlist must not change.
|
|
|
|
@item method
|
|
Use the given HTTP method to create the hls files.
|
|
@example
|
|
ffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8
|
|
@end example
|
|
This example will upload all the mpegts segment files to the HTTP
|
|
server using the HTTP PUT method, and update the m3u8 files every
|
|
@code{refresh} times using the same method.
|
|
Note that the HTTP server must support the given method for uploading
|
|
files.
|
|
|
|
@item http_user_agent
|
|
Override User-Agent field in HTTP header. Applicable only for HTTP output.
|
|
|
|
@item var_stream_map
|
|
Map string which specifies how to group the audio, video and subtitle streams
|
|
into different variant streams. The variant stream groups are separated
|
|
by space.
|
|
Expected string format is like this "a:0,v:0 a:1,v:1 ....". Here a:, v:, s: are
|
|
the keys to specify audio, video and subtitle streams respectively.
|
|
Allowed values are 0 to 9 (limited just based on practical usage).
|
|
|
|
When there are two or more variant streams, the output filename pattern must
|
|
contain the string "%v", this string specifies the position of variant stream
|
|
index in the output media playlist filenames. The string "%v" may be present in
|
|
the filename or in the last directory name containing the file. If the string is
|
|
present in the directory name, then sub-directories are created after expanding
|
|
the directory name pattern. This enables creation of variant streams in
|
|
subdirectories.
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
http://example.com/live/out_%v.m3u8
|
|
@end example
|
|
This example creates two hls variant streams. The first variant stream will
|
|
contain video stream of bitrate 1000k and audio stream of bitrate 64k and the
|
|
second variant stream will contain video stream of bitrate 256k and audio
|
|
stream of bitrate 32k. Here, two media playlist with file names out_0.m3u8 and
|
|
out_1.m3u8 will be created. If you want something meaningful text instead of indexes
|
|
in result names, you may specify names for each or some of the variants
|
|
as in the following example.
|
|
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0,name:my_hd v:1,a:1,name:my_sd" \
|
|
http://example.com/live/out_%v.m3u8
|
|
@end example
|
|
|
|
This example creates two hls variant streams as in the previous one.
|
|
But here, the two media playlist with file names out_my_hd.m3u8 and
|
|
out_my_sd.m3u8 will be created.
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k \
|
|
-map 0:v -map 0:a -map 0:v -f hls -var_stream_map "v:0 a:0 v:1" \
|
|
http://example.com/live/out_%v.m3u8
|
|
@end example
|
|
This example creates three hls variant streams. The first variant stream will
|
|
be a video only stream with video bitrate 1000k, the second variant stream will
|
|
be an audio only stream with bitrate 64k and the third variant stream will be a
|
|
video only stream with bitrate 256k. Here, three media playlist with file names
|
|
out_0.m3u8, out_1.m3u8 and out_2.m3u8 will be created.
|
|
@example
|
|
ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
http://example.com/live/vs_%v/out.m3u8
|
|
@end example
|
|
This example creates the variant streams in subdirectories. Here, the first
|
|
media playlist is created at @file{http://example.com/live/vs_0/out.m3u8} and
|
|
the second one at @file{http://example.com/live/vs_1/out.m3u8}.
|
|
@example
|
|
ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k -b:v:1 3000k \
|
|
-map 0:a -map 0:a -map 0:v -map 0:v -f hls \
|
|
-var_stream_map "a:0,agroup:aud_low a:1,agroup:aud_high v:0,agroup:aud_low v:1,agroup:aud_high" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
@end example
|
|
This example creates two audio only and two video only variant streams. In
|
|
addition to the #EXT-X-STREAM-INF tag for each variant stream in the master
|
|
playlist, #EXT-X-MEDIA tag is also added for the two audio only variant streams
|
|
and they are mapped to the two video only variant streams with audio group names
|
|
'aud_low' and 'aud_high'.
|
|
|
|
By default, a single hls variant containing all the encoded streams is created.
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
|
|
-map 0:a -map 0:a -map 0:v -f hls \
|
|
-var_stream_map "a:0,agroup:aud_low,default:yes a:1,agroup:aud_low v:0,agroup:aud_low" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
@end example
|
|
This example creates two audio only and one video only variant streams. In
|
|
addition to the #EXT-X-STREAM-INF tag for each variant stream in the master
|
|
playlist, #EXT-X-MEDIA tag is also added for the two audio only variant streams
|
|
and they are mapped to the one video only variant streams with audio group name
|
|
'aud_low', and the audio group have default stat is NO or YES.
|
|
|
|
By default, a single hls variant containing all the encoded streams is created.
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
|
|
-map 0:a -map 0:a -map 0:v -f hls \
|
|
-var_stream_map "a:0,agroup:aud_low,default:yes,language:ENG a:1,agroup:aud_low,language:CHN v:0,agroup:aud_low" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
@end example
|
|
This example creates two audio only and one video only variant streams. In
|
|
addition to the #EXT-X-STREAM-INF tag for each variant stream in the master
|
|
playlist, #EXT-X-MEDIA tag is also added for the two audio only variant streams
|
|
and they are mapped to the one video only variant streams with audio group name
|
|
'aud_low', and the audio group have default stat is NO or YES, and one audio
|
|
have and language is named ENG, the other audio language is named CHN.
|
|
|
|
By default, a single hls variant containing all the encoded streams is created.
|
|
|
|
@item cc_stream_map
|
|
Map string which specifies different closed captions groups and their
|
|
attributes. The closed captions stream groups are separated by space.
|
|
Expected string format is like this
|
|
"ccgroup:<group name>,instreamid:<INSTREAM-ID>,language:<language code> ....".
|
|
'ccgroup' and 'instreamid' are mandatory attributes. 'language' is an optional
|
|
attribute.
|
|
The closed captions groups configured using this option are mapped to different
|
|
variant streams by providing the same 'ccgroup' name in the
|
|
@code{var_stream_map} string. If @code{var_stream_map} is not set, then the
|
|
first available ccgroup in @code{cc_stream_map} is mapped to the output variant
|
|
stream. The examples for these two use cases are given below.
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -b:v 1000k -b:a 64k -a53cc 1 -f hls \
|
|
-cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out.m3u8
|
|
@end example
|
|
This example adds @code{#EXT-X-MEDIA} tag with @code{TYPE=CLOSED-CAPTIONS} in
|
|
the master playlist with group name 'cc', language 'en' (english) and
|
|
INSTREAM-ID 'CC1'. Also, it adds @code{CLOSED-CAPTIONS} attribute with group
|
|
name 'cc' for the output variant stream.
|
|
@example
|
|
ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-a53cc:0 1 -a53cc:1 1\
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls \
|
|
-cc_stream_map "ccgroup:cc,instreamid:CC1,language:en ccgroup:cc,instreamid:CC2,language:sp" \
|
|
-var_stream_map "v:0,a:0,ccgroup:cc v:1,a:1,ccgroup:cc" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
@end example
|
|
This example adds two @code{#EXT-X-MEDIA} tags with @code{TYPE=CLOSED-CAPTIONS} in
|
|
the master playlist for the INSTREAM-IDs 'CC1' and 'CC2'. Also, it adds
|
|
@code{CLOSED-CAPTIONS} attribute with group name 'cc' for the two output variant
|
|
streams.
|
|
|
|
@item master_pl_name
|
|
Create HLS master playlist with the given name.
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 http://example.com/live/out.m3u8
|
|
@end example
|
|
This example creates HLS master playlist with name master.m3u8 and it is
|
|
published at http://example.com/live/
|
|
|
|
@item master_pl_publish_rate
|
|
Publish master play list repeatedly every after specified number of segment intervals.
|
|
|
|
@example
|
|
ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 \
|
|
-hls_time 2 -master_pl_publish_rate 30 http://example.com/live/out.m3u8
|
|
@end example
|
|
|
|
This example creates HLS master playlist with name master.m3u8 and keep
|
|
publishing it repeatedly every after 30 segments i.e. every after 60s.
|
|
|
|
@item http_persistent
|
|
Use persistent HTTP connections. Applicable only for HTTP output.
|
|
|
|
@item timeout
|
|
Set timeout for socket I/O operations. Applicable only for HTTP output.
|
|
|
|
@item -ignore_io_errors
|
|
Ignore IO errors during open, write and delete. Useful for long-duration runs with network output.
|
|
|
|
@item headers
|
|
Set custom HTTP headers, can override built in default headers. Applicable only for HTTP output.
|
|
|
|
@end table
|
|
|
|
@anchor{ico}
|
|
@section ico
|
|
|
|
ICO file muxer.
|
|
|
|
Microsoft's icon file format (ICO) has some strict limitations that should be noted:
|
|
|
|
@itemize
|
|
@item
|
|
Size cannot exceed 256 pixels in any dimension
|
|
|
|
@item
|
|
Only BMP and PNG images can be stored
|
|
|
|
@item
|
|
If a BMP image is used, it must be one of the following pixel formats:
|
|
@example
|
|
BMP Bit Depth FFmpeg Pixel Format
|
|
1bit pal8
|
|
4bit pal8
|
|
8bit pal8
|
|
16bit rgb555le
|
|
24bit bgr24
|
|
32bit bgra
|
|
@end example
|
|
|
|
@item
|
|
If a BMP image is used, it must use the BITMAPINFOHEADER DIB header
|
|
|
|
@item
|
|
If a PNG image is used, it must use the rgba pixel format
|
|
@end itemize
|
|
|
|
@anchor{image2}
|
|
@section image2
|
|
|
|
Image file muxer.
|
|
|
|
The image file muxer writes video frames to image files.
|
|
|
|
The output filenames are specified by a pattern, which can be used to
|
|
produce sequentially numbered series of files.
|
|
The pattern may contain the string "%d" or "%0@var{N}d", this string
|
|
specifies the position of the characters representing a numbering in
|
|
the filenames. If the form "%0@var{N}d" is used, the string
|
|
representing the number in each filename is 0-padded to @var{N}
|
|
digits. The literal character '%' can be specified in the pattern with
|
|
the string "%%".
|
|
|
|
If the pattern contains "%d" or "%0@var{N}d", the first filename of
|
|
the file list specified will contain the number 1, all the following
|
|
numbers will be sequential.
|
|
|
|
The pattern may contain a suffix which is used to automatically
|
|
determine the format of the image files to write.
|
|
|
|
For example the pattern "img-%03d.bmp" will specify a sequence of
|
|
filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
|
|
@file{img-010.bmp}, etc.
|
|
The pattern "img%%-%d.jpg" will specify a sequence of filenames of the
|
|
form @file{img%-1.jpg}, @file{img%-2.jpg}, ..., @file{img%-10.jpg},
|
|
etc.
|
|
|
|
@subsection Examples
|
|
|
|
The following example shows how to use @command{ffmpeg} for creating a
|
|
sequence of files @file{img-001.jpeg}, @file{img-002.jpeg}, ...,
|
|
taking one image every second from the input video:
|
|
@example
|
|
ffmpeg -i in.avi -vsync cfr -r 1 -f image2 'img-%03d.jpeg'
|
|
@end example
|
|
|
|
Note that with @command{ffmpeg}, if the format is not specified with the
|
|
@code{-f} option and the output filename specifies an image file
|
|
format, the image2 muxer is automatically selected, so the previous
|
|
command can be written as:
|
|
@example
|
|
ffmpeg -i in.avi -vsync cfr -r 1 'img-%03d.jpeg'
|
|
@end example
|
|
|
|
Note also that the pattern must not necessarily contain "%d" or
|
|
"%0@var{N}d", for example to create a single image file
|
|
@file{img.jpeg} from the start of the input video you can employ the command:
|
|
@example
|
|
ffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg
|
|
@end example
|
|
|
|
The @option{strftime} option allows you to expand the filename with
|
|
date and time information. Check the documentation of
|
|
the @code{strftime()} function for the syntax.
|
|
|
|
For example to generate image files from the @code{strftime()}
|
|
"%Y-%m-%d_%H-%M-%S" pattern, the following @command{ffmpeg} command
|
|
can be used:
|
|
@example
|
|
ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 "%Y-%m-%d_%H-%M-%S.jpg"
|
|
@end example
|
|
|
|
You can set the file name with current frame's PTS:
|
|
@example
|
|
ffmpeg -f v4l2 -r 1 -i /dev/video0 -copyts -f image2 -frame_pts true %d.jpg"
|
|
@end example
|
|
|
|
@subsection Options
|
|
|
|
@table @option
|
|
@item frame_pts
|
|
If set to 1, expand the filename with pts from pkt->pts.
|
|
Default value is 0.
|
|
|
|
@item start_number
|
|
Start the sequence from the specified number. Default value is 1.
|
|
|
|
@item update
|
|
If set to 1, the filename will always be interpreted as just a
|
|
filename, not a pattern, and the corresponding file will be continuously
|
|
overwritten with new images. Default value is 0.
|
|
|
|
@item strftime
|
|
If set to 1, expand the filename with date and time information from
|
|
@code{strftime()}. Default value is 0.
|
|
@end table
|
|
|
|
The image muxer supports the .Y.U.V image file format. This format is
|
|
special in that that each image frame consists of three files, for
|
|
each of the YUV420P components. To read or write this image file format,
|
|
specify the name of the '.Y' file. The muxer will automatically open the
|
|
'.U' and '.V' files as required.
|
|
|
|
@section matroska
|
|
|
|
Matroska container muxer.
|
|
|
|
This muxer implements the matroska and webm container specs.
|
|
|
|
@subsection Metadata
|
|
|
|
The recognized metadata settings in this muxer are:
|
|
|
|
@table @option
|
|
@item title
|
|
Set title name provided to a single track.
|
|
|
|
@item language
|
|
Specify the language of the track in the Matroska languages form.
|
|
|
|
The language can be either the 3 letters bibliographic ISO-639-2 (ISO
|
|
639-2/B) form (like "fre" for French), or a language code mixed with a
|
|
country code for specialities in languages (like "fre-ca" for Canadian
|
|
French).
|
|
|
|
@item stereo_mode
|
|
Set stereo 3D video layout of two views in a single video track.
|
|
|
|
The following values are recognized:
|
|
@table @samp
|
|
@item mono
|
|
video is not stereo
|
|
@item left_right
|
|
Both views are arranged side by side, Left-eye view is on the left
|
|
@item bottom_top
|
|
Both views are arranged in top-bottom orientation, Left-eye view is at bottom
|
|
@item top_bottom
|
|
Both views are arranged in top-bottom orientation, Left-eye view is on top
|
|
@item checkerboard_rl
|
|
Each view is arranged in a checkerboard interleaved pattern, Left-eye view being first
|
|
@item checkerboard_lr
|
|
Each view is arranged in a checkerboard interleaved pattern, Right-eye view being first
|
|
@item row_interleaved_rl
|
|
Each view is constituted by a row based interleaving, Right-eye view is first row
|
|
@item row_interleaved_lr
|
|
Each view is constituted by a row based interleaving, Left-eye view is first row
|
|
@item col_interleaved_rl
|
|
Both views are arranged in a column based interleaving manner, Right-eye view is first column
|
|
@item col_interleaved_lr
|
|
Both views are arranged in a column based interleaving manner, Left-eye view is first column
|
|
@item anaglyph_cyan_red
|
|
All frames are in anaglyph format viewable through red-cyan filters
|
|
@item right_left
|
|
Both views are arranged side by side, Right-eye view is on the left
|
|
@item anaglyph_green_magenta
|
|
All frames are in anaglyph format viewable through green-magenta filters
|
|
@item block_lr
|
|
Both eyes laced in one Block, Left-eye view is first
|
|
@item block_rl
|
|
Both eyes laced in one Block, Right-eye view is first
|
|
@end table
|
|
@end table
|
|
|
|
For example a 3D WebM clip can be created using the following command line:
|
|
@example
|
|
ffmpeg -i sample_left_right_clip.mpg -an -c:v libvpx -metadata stereo_mode=left_right -y stereo_clip.webm
|
|
@end example
|
|
|
|
@subsection Options
|
|
|
|
This muxer supports the following options:
|
|
|
|
@table @option
|
|
@item reserve_index_space
|
|
By default, this muxer writes the index for seeking (called cues in Matroska
|
|
terms) at the end of the file, because it cannot know in advance how much space
|
|
to leave for the index at the beginning of the file. However for some use cases
|
|
-- e.g. streaming where seeking is possible but slow -- it is useful to put the
|
|
index at the beginning of the file.
|
|
|
|
If this option is set to a non-zero value, the muxer will reserve a given amount
|
|
of space in the file header and then try to write the cues there when the muxing
|
|
finishes. If the available space does not suffice, muxing will fail. A safe size
|
|
for most use cases should be about 50kB per hour of video.
|
|
|
|
Note that cues are only written if the output is seekable and this option will
|
|
have no effect if it is not.
|
|
@end table
|
|
|
|
@anchor{md5}
|
|
@section md5
|
|
|
|
MD5 testing format.
|
|
|
|
This is a variant of the @ref{hash} muxer. Unlike that muxer, it
|
|
defaults to using the MD5 hash function.
|
|
|
|
@subsection Examples
|
|
|
|
To compute the MD5 hash of the input converted to raw
|
|
audio and video, and store it in the file @file{out.md5}:
|
|
@example
|
|
ffmpeg -i INPUT -f md5 out.md5
|
|
@end example
|
|
|
|
You can print the MD5 to stdout with the command:
|
|
@example
|
|
ffmpeg -i INPUT -f md5 -
|
|
@end example
|
|
|
|
See also the @ref{hash} and @ref{framemd5} muxers.
|
|
|
|
@section mov, mp4, ismv
|
|
|
|
MOV/MP4/ISMV (Smooth Streaming) muxer.
|
|
|
|
The mov/mp4/ismv muxer supports fragmentation. Normally, a MOV/MP4
|
|
file has all the metadata about all packets stored in one location
|
|
(written at the end of the file, it can be moved to the start for
|
|
better playback by adding @var{faststart} to the @var{movflags}, or
|
|
using the @command{qt-faststart} tool). A fragmented
|
|
file consists of a number of fragments, where packets and metadata
|
|
about these packets are stored together. Writing a fragmented
|
|
file has the advantage that the file is decodable even if the
|
|
writing is interrupted (while a normal MOV/MP4 is undecodable if
|
|
it is not properly finished), and it requires less memory when writing
|
|
very long files (since writing normal MOV/MP4 files stores info about
|
|
every single packet in memory until the file is closed). The downside
|
|
is that it is less compatible with other applications.
|
|
|
|
@subsection Options
|
|
|
|
Fragmentation is enabled by setting one of the AVOptions that define
|
|
how to cut the file into fragments:
|
|
|
|
@table @option
|
|
@item -moov_size @var{bytes}
|
|
Reserves space for the moov atom at the beginning of the file instead of placing the
|
|
moov atom at the end. If the space reserved is insufficient, muxing will fail.
|
|
@item -movflags frag_keyframe
|
|
Start a new fragment at each video keyframe.
|
|
@item -frag_duration @var{duration}
|
|
Create fragments that are @var{duration} microseconds long.
|
|
@item -frag_size @var{size}
|
|
Create fragments that contain up to @var{size} bytes of payload data.
|
|
@item -movflags frag_custom
|
|
Allow the caller to manually choose when to cut fragments, by
|
|
calling @code{av_write_frame(ctx, NULL)} to write a fragment with
|
|
the packets written so far. (This is only useful with other
|
|
applications integrating libavformat, not from @command{ffmpeg}.)
|
|
@item -min_frag_duration @var{duration}
|
|
Don't create fragments that are shorter than @var{duration} microseconds long.
|
|
@end table
|
|
|
|
If more than one condition is specified, fragments are cut when
|
|
one of the specified conditions is fulfilled. The exception to this is
|
|
@code{-min_frag_duration}, which has to be fulfilled for any of the other
|
|
conditions to apply.
|
|
|
|
Additionally, the way the output file is written can be adjusted
|
|
through a few other options:
|
|
|
|
@table @option
|
|
@item -movflags empty_moov
|
|
Write an initial moov atom directly at the start of the file, without
|
|
describing any samples in it. Generally, an mdat/moov pair is written
|
|
at the start of the file, as a normal MOV/MP4 file, containing only
|
|
a short portion of the file. With this option set, there is no initial
|
|
mdat atom, and the moov atom only describes the tracks but has
|
|
a zero duration.
|
|
|
|
This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
@item -movflags separate_moof
|
|
Write a separate moof (movie fragment) atom for each track. Normally,
|
|
packets for all tracks are written in a moof atom (which is slightly
|
|
more efficient), but with this option set, the muxer writes one moof/mdat
|
|
pair for each track, making it easier to separate tracks.
|
|
|
|
This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
@item -movflags skip_sidx
|
|
Skip writing of sidx atom. When bitrate overhead due to sidx atom is high,
|
|
this option could be used for cases where sidx atom is not mandatory.
|
|
When global_sidx flag is enabled, this option will be ignored.
|
|
@item -movflags faststart
|
|
Run a second pass moving the index (moov atom) to the beginning of the file.
|
|
This operation can take a while, and will not work in various situations such
|
|
as fragmented output, thus it is not enabled by default.
|
|
@item -movflags rtphint
|
|
Add RTP hinting tracks to the output file.
|
|
@item -movflags disable_chpl
|
|
Disable Nero chapter markers (chpl atom). Normally, both Nero chapters
|
|
and a QuickTime chapter track are written to the file. With this option
|
|
set, only the QuickTime chapter track will be written. Nero chapters can
|
|
cause failures when the file is reprocessed with certain tagging programs, like
|
|
mp3Tag 2.61a and iTunes 11.3, most likely other versions are affected as well.
|
|
@item -movflags omit_tfhd_offset
|
|
Do not write any absolute base_data_offset in tfhd atoms. This avoids
|
|
tying fragments to absolute byte positions in the file/streams.
|
|
@item -movflags default_base_moof
|
|
Similarly to the omit_tfhd_offset, this flag avoids writing the
|
|
absolute base_data_offset field in tfhd atoms, but does so by using
|
|
the new default-base-is-moof flag instead. This flag is new from
|
|
14496-12:2012. This may make the fragments easier to parse in certain
|
|
circumstances (avoiding basing track fragment location calculations
|
|
on the implicit end of the previous track fragment).
|
|
@item -write_tmcd
|
|
Specify @code{on} to force writing a timecode track, @code{off} to disable it
|
|
and @code{auto} to write a timecode track only for mov and mp4 output (default).
|
|
@item -movflags negative_cts_offsets
|
|
Enables utilization of version 1 of the CTTS box, in which the CTS offsets can
|
|
be negative. This enables the initial sample to have DTS/CTS of zero, and
|
|
reduces the need for edit lists for some cases such as video tracks with
|
|
B-frames. Additionally, eases conformance with the DASH-IF interoperability
|
|
guidelines.
|
|
|
|
This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
@item -write_prft
|
|
Write producer time reference box (PRFT) with a specified time source for the
|
|
NTP field in the PRFT box. Set value as @samp{wallclock} to specify timesource
|
|
as wallclock time and @samp{pts} to specify timesource as input packets' PTS
|
|
values.
|
|
|
|
Setting value to @samp{pts} is applicable only for a live encoding use case,
|
|
where PTS values are set as as wallclock time at the source. For example, an
|
|
encoding use case with decklink capture source where @option{video_pts} and
|
|
@option{audio_pts} are set to @samp{abs_wallclock}.
|
|
@end table
|
|
|
|
@subsection Example
|
|
|
|
Smooth Streaming content can be pushed in real time to a publishing
|
|
point on IIS with this muxer. Example:
|
|
@example
|
|
ffmpeg -re @var{<normal input/transcoding options>} -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)
|
|
@end example
|
|
|
|
@subsection Audible AAX
|
|
|
|
Audible AAX files are encrypted M4B files, and they can be decrypted by specifying a 4 byte activation secret.
|
|
@example
|
|
ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
|
|
@end example
|
|
|
|
@section mp3
|
|
|
|
The MP3 muxer writes a raw MP3 stream with the following optional features:
|
|
@itemize @bullet
|
|
@item
|
|
An ID3v2 metadata header at the beginning (enabled by default). Versions 2.3 and
|
|
2.4 are supported, the @code{id3v2_version} private option controls which one is
|
|
used (3 or 4). Setting @code{id3v2_version} to 0 disables the ID3v2 header
|
|
completely.
|
|
|
|
The muxer supports writing attached pictures (APIC frames) to the ID3v2 header.
|
|
The pictures are supplied to the muxer in form of a video stream with a single
|
|
packet. There can be any number of those streams, each will correspond to a
|
|
single APIC frame. The stream metadata tags @var{title} and @var{comment} map
|
|
to APIC @var{description} and @var{picture type} respectively. See
|
|
@url{http://id3.org/id3v2.4.0-frames} for allowed picture types.
|
|
|
|
Note that the APIC frames must be written at the beginning, so the muxer will
|
|
buffer the audio frames until it gets all the pictures. It is therefore advised
|
|
to provide the pictures as soon as possible to avoid excessive buffering.
|
|
|
|
@item
|
|
A Xing/LAME frame right after the ID3v2 header (if present). It is enabled by
|
|
default, but will be written only if the output is seekable. The
|
|
@code{write_xing} private option can be used to disable it. The frame contains
|
|
various information that may be useful to the decoder, like the audio duration
|
|
or encoder delay.
|
|
|
|
@item
|
|
A legacy ID3v1 tag at the end of the file (disabled by default). It may be
|
|
enabled with the @code{write_id3v1} private option, but as its capabilities are
|
|
very limited, its usage is not recommended.
|
|
@end itemize
|
|
|
|
Examples:
|
|
|
|
Write an mp3 with an ID3v2.3 header and an ID3v1 footer:
|
|
@example
|
|
ffmpeg -i INPUT -id3v2_version 3 -write_id3v1 1 out.mp3
|
|
@end example
|
|
|
|
To attach a picture to an mp3 file select both the audio and the picture stream
|
|
with @code{map}:
|
|
@example
|
|
ffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1
|
|
-metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3
|
|
@end example
|
|
|
|
Write a "clean" MP3 without any extra features:
|
|
@example
|
|
ffmpeg -i input.wav -write_xing 0 -id3v2_version 0 out.mp3
|
|
@end example
|
|
|
|
@section mpegts
|
|
|
|
MPEG transport stream muxer.
|
|
|
|
This muxer implements ISO 13818-1 and part of ETSI EN 300 468.
|
|
|
|
The recognized metadata settings in mpegts muxer are @code{service_provider}
|
|
and @code{service_name}. If they are not set the default for
|
|
@code{service_provider} is @samp{FFmpeg} and the default for
|
|
@code{service_name} is @samp{Service01}.
|
|
|
|
@subsection Options
|
|
|
|
The muxer options are:
|
|
|
|
@table @option
|
|
@item mpegts_transport_stream_id @var{integer}
|
|
Set the @samp{transport_stream_id}. This identifies a transponder in DVB.
|
|
Default is @code{0x0001}.
|
|
|
|
@item mpegts_original_network_id @var{integer}
|
|
Set the @samp{original_network_id}. This is unique identifier of a
|
|
network in DVB. Its main use is in the unique identification of a service
|
|
through the path @samp{Original_Network_ID, Transport_Stream_ID}. Default
|
|
is @code{0x0001}.
|
|
|
|
@item mpegts_service_id @var{integer}
|
|
Set the @samp{service_id}, also known as program in DVB. Default is
|
|
@code{0x0001}.
|
|
|
|
@item mpegts_service_type @var{integer}
|
|
Set the program @samp{service_type}. Default is @code{digital_tv}.
|
|
Accepts the following options:
|
|
@table @samp
|
|
@item hex_value
|
|
Any hexadecimal value between @code{0x01} and @code{0xff} as defined in
|
|
ETSI 300 468.
|
|
@item digital_tv
|
|
Digital TV service.
|
|
@item digital_radio
|
|
Digital Radio service.
|
|
@item teletext
|
|
Teletext service.
|
|
@item advanced_codec_digital_radio
|
|
Advanced Codec Digital Radio service.
|
|
@item mpeg2_digital_hdtv
|
|
MPEG2 Digital HDTV service.
|
|
@item advanced_codec_digital_sdtv
|
|
Advanced Codec Digital SDTV service.
|
|
@item advanced_codec_digital_hdtv
|
|
Advanced Codec Digital HDTV service.
|
|
@end table
|
|
|
|
@item mpegts_pmt_start_pid @var{integer}
|
|
Set the first PID for PMT. Default is @code{0x1000}. Max is @code{0x1f00}.
|
|
|
|
@item mpegts_start_pid @var{integer}
|
|
Set the first PID for data packets. Default is @code{0x0100}. Max is
|
|
@code{0x0f00}.
|
|
|
|
@item mpegts_m2ts_mode @var{boolean}
|
|
Enable m2ts mode if set to @code{1}. Default value is @code{-1} which
|
|
disables m2ts mode.
|
|
|
|
@item muxrate @var{integer}
|
|
Set a constant muxrate. Default is VBR.
|
|
|
|
@item pes_payload_size @var{integer}
|
|
Set minimum PES packet payload in bytes. Default is @code{2930}.
|
|
|
|
@item mpegts_flags @var{flags}
|
|
Set mpegts flags. Accepts the following options:
|
|
@table @samp
|
|
@item resend_headers
|
|
Reemit PAT/PMT before writing the next packet.
|
|
@item latm
|
|
Use LATM packetization for AAC.
|
|
@item pat_pmt_at_frames
|
|
Reemit PAT and PMT at each video frame.
|
|
@item system_b
|
|
Conform to System B (DVB) instead of System A (ATSC).
|
|
@item initial_discontinuity
|
|
Mark the initial packet of each stream as discontinuity.
|
|
@end table
|
|
|
|
@item mpegts_copyts @var{boolean}
|
|
Preserve original timestamps, if value is set to @code{1}. Default value
|
|
is @code{-1}, which results in shifting timestamps so that they start from 0.
|
|
|
|
@item omit_video_pes_length @var{boolean}
|
|
Omit the PES packet length for video packets. Default is @code{1} (true).
|
|
|
|
@item pcr_period @var{integer}
|
|
Override the default PCR retransmission time in milliseconds. Default is
|
|
@code{-1} which means that the PCR interval will be determined automatically:
|
|
20 ms is used for CBR streams, the highest multiple of the frame duration which
|
|
is less than 100 ms is used for VBR streams.
|
|
|
|
@item pat_period @var{duration}
|
|
Maximum time in seconds between PAT/PMT tables. Default is @code{0.1}.
|
|
|
|
@item sdt_period @var{duration}
|
|
Maximum time in seconds between SDT tables. Default is @code{0.5}.
|
|
|
|
@item tables_version @var{integer}
|
|
Set PAT, PMT and SDT version (default @code{0}, valid values are from 0 to 31, inclusively).
|
|
This option allows updating stream structure so that standard consumer may
|
|
detect the change. To do so, reopen output @code{AVFormatContext} (in case of API
|
|
usage) or restart @command{ffmpeg} instance, cyclically changing
|
|
@option{tables_version} value:
|
|
|
|
@example
|
|
ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
|
|
ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
|
|
...
|
|
ffmpeg -i source3.ts -codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
|
|
ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
|
|
ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
|
|
...
|
|
@end example
|
|
@end table
|
|
|
|
@subsection Example
|
|
|
|
@example
|
|
ffmpeg -i file.mpg -c copy \
|
|
-mpegts_original_network_id 0x1122 \
|
|
-mpegts_transport_stream_id 0x3344 \
|
|
-mpegts_service_id 0x5566 \
|
|
-mpegts_pmt_start_pid 0x1500 \
|
|
-mpegts_start_pid 0x150 \
|
|
-metadata service_provider="Some provider" \
|
|
-metadata service_name="Some Channel" \
|
|
out.ts
|
|
@end example
|
|
|
|
@section mxf, mxf_d10, mxf_opatom
|
|
|
|
MXF muxer.
|
|
|
|
@subsection Options
|
|
|
|
The muxer options are:
|
|
|
|
@table @option
|
|
@item store_user_comments @var{bool}
|
|
Set if user comments should be stored if available or never.
|
|
IRT D-10 does not allow user comments. The default is thus to write them for
|
|
mxf and mxf_opatom but not for mxf_d10
|
|
@end table
|
|
|
|
@section null
|
|
|
|
Null muxer.
|
|
|
|
This muxer does not generate any output file, it is mainly useful for
|
|
testing or benchmarking purposes.
|
|
|
|
For example to benchmark decoding with @command{ffmpeg} you can use the
|
|
command:
|
|
@example
|
|
ffmpeg -benchmark -i INPUT -f null out.null
|
|
@end example
|
|
|
|
Note that the above command does not read or write the @file{out.null}
|
|
file, but specifying the output file is required by the @command{ffmpeg}
|
|
syntax.
|
|
|
|
Alternatively you can write the command as:
|
|
@example
|
|
ffmpeg -benchmark -i INPUT -f null -
|
|
@end example
|
|
|
|
@section nut
|
|
|
|
@table @option
|
|
@item -syncpoints @var{flags}
|
|
Change the syncpoint usage in nut:
|
|
@table @option
|
|
@item @var{default} use the normal low-overhead seeking aids.
|
|
@item @var{none} do not use the syncpoints at all, reducing the overhead but making the stream non-seekable;
|
|
Use of this option is not recommended, as the resulting files are very damage
|
|
sensitive and seeking is not possible. Also in general the overhead from
|
|
syncpoints is negligible. Note, -@code{write_index} 0 can be used to disable
|
|
all growing data tables, allowing to mux endless streams with limited memory
|
|
and without these disadvantages.
|
|
@item @var{timestamped} extend the syncpoint with a wallclock field.
|
|
@end table
|
|
The @var{none} and @var{timestamped} flags are experimental.
|
|
@item -write_index @var{bool}
|
|
Write index at the end, the default is to write an index.
|
|
@end table
|
|
|
|
@example
|
|
ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor
|
|
@end example
|
|
|
|
@section ogg
|
|
|
|
Ogg container muxer.
|
|
|
|
@table @option
|
|
@item -page_duration @var{duration}
|
|
Preferred page duration, in microseconds. The muxer will attempt to create
|
|
pages that are approximately @var{duration} microseconds long. This allows the
|
|
user to compromise between seek granularity and container overhead. The default
|
|
is 1 second. A value of 0 will fill all segments, making pages as large as
|
|
possible. A value of 1 will effectively use 1 packet-per-page in most
|
|
situations, giving a small seek granularity at the cost of additional container
|
|
overhead.
|
|
@item -serial_offset @var{value}
|
|
Serial value from which to set the streams serial number.
|
|
Setting it to different and sufficiently large values ensures that the produced
|
|
ogg files can be safely chained.
|
|
|
|
@end table
|
|
|
|
@anchor{segment}
|
|
@section segment, stream_segment, ssegment
|
|
|
|
Basic stream segmenter.
|
|
|
|
This muxer outputs streams to a number of separate files of nearly
|
|
fixed duration. Output filename pattern can be set in a fashion
|
|
similar to @ref{image2}, or by using a @code{strftime} template if
|
|
the @option{strftime} option is enabled.
|
|
|
|
@code{stream_segment} is a variant of the muxer used to write to
|
|
streaming output formats, i.e. which do not require global headers,
|
|
and is recommended for outputting e.g. to MPEG transport stream segments.
|
|
@code{ssegment} is a shorter alias for @code{stream_segment}.
|
|
|
|
Every segment starts with a keyframe of the selected reference stream,
|
|
which is set through the @option{reference_stream} option.
|
|
|
|
Note that if you want accurate splitting for a video file, you need to
|
|
make the input key frames correspond to the exact splitting times
|
|
expected by the segmenter, or the segment muxer will start the new
|
|
segment with the key frame found next after the specified start
|
|
time.
|
|
|
|
The segment muxer works best with a single constant frame rate video.
|
|
|
|
Optionally it can generate a list of the created segments, by setting
|
|
the option @var{segment_list}. The list type is specified by the
|
|
@var{segment_list_type} option. The entry filenames in the segment
|
|
list are set by default to the basename of the corresponding segment
|
|
files.
|
|
|
|
See also the @ref{hls} muxer, which provides a more specific
|
|
implementation for HLS segmentation.
|
|
|
|
@subsection Options
|
|
|
|
The segment muxer supports the following options:
|
|
|
|
@table @option
|
|
@item increment_tc @var{1|0}
|
|
if set to @code{1}, increment timecode between each segment
|
|
If this is selected, the input need to have
|
|
a timecode in the first video stream. Default value is
|
|
@code{0}.
|
|
|
|
@item reference_stream @var{specifier}
|
|
Set the reference stream, as specified by the string @var{specifier}.
|
|
If @var{specifier} is set to @code{auto}, the reference is chosen
|
|
automatically. Otherwise it must be a stream specifier (see the ``Stream
|
|
specifiers'' chapter in the ffmpeg manual) which specifies the
|
|
reference stream. The default value is @code{auto}.
|
|
|
|
@item segment_format @var{format}
|
|
Override the inner container format, by default it is guessed by the filename
|
|
extension.
|
|
|
|
@item segment_format_options @var{options_list}
|
|
Set output format options using a :-separated list of key=value
|
|
parameters. Values containing the @code{:} special character must be
|
|
escaped.
|
|
|
|
@item segment_list @var{name}
|
|
Generate also a listfile named @var{name}. If not specified no
|
|
listfile is generated.
|
|
|
|
@item segment_list_flags @var{flags}
|
|
Set flags affecting the segment list generation.
|
|
|
|
It currently supports the following flags:
|
|
@table @samp
|
|
@item cache
|
|
Allow caching (only affects M3U8 list files).
|
|
|
|
@item live
|
|
Allow live-friendly file generation.
|
|
@end table
|
|
|
|
@item segment_list_size @var{size}
|
|
Update the list file so that it contains at most @var{size}
|
|
segments. If 0 the list file will contain all the segments. Default
|
|
value is 0.
|
|
|
|
@item segment_list_entry_prefix @var{prefix}
|
|
Prepend @var{prefix} to each entry. Useful to generate absolute paths.
|
|
By default no prefix is applied.
|
|
|
|
@item segment_list_type @var{type}
|
|
Select the listing format.
|
|
|
|
The following values are recognized:
|
|
@table @samp
|
|
@item flat
|
|
Generate a flat list for the created segments, one segment per line.
|
|
|
|
@item csv, ext
|
|
Generate a list for the created segments, one segment per line,
|
|
each line matching the format (comma-separated values):
|
|
@example
|
|
@var{segment_filename},@var{segment_start_time},@var{segment_end_time}
|
|
@end example
|
|
|
|
@var{segment_filename} is the name of the output file generated by the
|
|
muxer according to the provided pattern. CSV escaping (according to
|
|
RFC4180) is applied if required.
|
|
|
|
@var{segment_start_time} and @var{segment_end_time} specify
|
|
the segment start and end time expressed in seconds.
|
|
|
|
A list file with the suffix @code{".csv"} or @code{".ext"} will
|
|
auto-select this format.
|
|
|
|
@samp{ext} is deprecated in favor or @samp{csv}.
|
|
|
|
@item ffconcat
|
|
Generate an ffconcat file for the created segments. The resulting file
|
|
can be read using the FFmpeg @ref{concat} demuxer.
|
|
|
|
A list file with the suffix @code{".ffcat"} or @code{".ffconcat"} will
|
|
auto-select this format.
|
|
|
|
@item m3u8
|
|
Generate an extended M3U8 file, version 3, compliant with
|
|
@url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}.
|
|
|
|
A list file with the suffix @code{".m3u8"} will auto-select this format.
|
|
@end table
|
|
|
|
If not specified the type is guessed from the list file name suffix.
|
|
|
|
@item segment_time @var{time}
|
|
Set segment duration to @var{time}, the value must be a duration
|
|
specification. Default value is "2". See also the
|
|
@option{segment_times} option.
|
|
|
|
Note that splitting may not be accurate, unless you force the
|
|
reference stream key-frames at the given time. See the introductory
|
|
notice and the examples below.
|
|
|
|
@item segment_atclocktime @var{1|0}
|
|
If set to "1" split at regular clock time intervals starting from 00:00
|
|
o'clock. The @var{time} value specified in @option{segment_time} is
|
|
used for setting the length of the splitting interval.
|
|
|
|
For example with @option{segment_time} set to "900" this makes it possible
|
|
to create files at 12:00 o'clock, 12:15, 12:30, etc.
|
|
|
|
Default value is "0".
|
|
|
|
@item segment_clocktime_offset @var{duration}
|
|
Delay the segment splitting times with the specified duration when using
|
|
@option{segment_atclocktime}.
|
|
|
|
For example with @option{segment_time} set to "900" and
|
|
@option{segment_clocktime_offset} set to "300" this makes it possible to
|
|
create files at 12:05, 12:20, 12:35, etc.
|
|
|
|
Default value is "0".
|
|
|
|
@item segment_clocktime_wrap_duration @var{duration}
|
|
Force the segmenter to only start a new segment if a packet reaches the muxer
|
|
within the specified duration after the segmenting clock time. This way you
|
|
can make the segmenter more resilient to backward local time jumps, such as
|
|
leap seconds or transition to standard time from daylight savings time.
|
|
|
|
Default is the maximum possible duration which means starting a new segment
|
|
regardless of the elapsed time since the last clock time.
|
|
|
|
@item segment_time_delta @var{delta}
|
|
Specify the accuracy time when selecting the start time for a
|
|
segment, expressed as a duration specification. Default value is "0".
|
|
|
|
When delta is specified a key-frame will start a new segment if its
|
|
PTS satisfies the relation:
|
|
@example
|
|
PTS >= start_time - time_delta
|
|
@end example
|
|
|
|
This option is useful when splitting video content, which is always
|
|
split at GOP boundaries, in case a key frame is found just before the
|
|
specified split time.
|
|
|
|
In particular may be used in combination with the @file{ffmpeg} option
|
|
@var{force_key_frames}. The key frame times specified by
|
|
@var{force_key_frames} may not be set accurately because of rounding
|
|
issues, with the consequence that a key frame time may result set just
|
|
before the specified time. For constant frame rate videos a value of
|
|
1/(2*@var{frame_rate}) should address the worst case mismatch between
|
|
the specified time and the time set by @var{force_key_frames}.
|
|
|
|
@item segment_times @var{times}
|
|
Specify a list of split points. @var{times} contains a list of comma
|
|
separated duration specifications, in increasing order. See also
|
|
the @option{segment_time} option.
|
|
|
|
@item segment_frames @var{frames}
|
|
Specify a list of split video frame numbers. @var{frames} contains a
|
|
list of comma separated integer numbers, in increasing order.
|
|
|
|
This option specifies to start a new segment whenever a reference
|
|
stream key frame is found and the sequential number (starting from 0)
|
|
of the frame is greater or equal to the next value in the list.
|
|
|
|
@item segment_wrap @var{limit}
|
|
Wrap around segment index once it reaches @var{limit}.
|
|
|
|
@item segment_start_number @var{number}
|
|
Set the sequence number of the first segment. Defaults to @code{0}.
|
|
|
|
@item strftime @var{1|0}
|
|
Use the @code{strftime} function to define the name of the new
|
|
segments to write. If this is selected, the output segment name must
|
|
contain a @code{strftime} function template. Default value is
|
|
@code{0}.
|
|
|
|
@item break_non_keyframes @var{1|0}
|
|
If enabled, allow segments to start on frames other than keyframes. This
|
|
improves behavior on some players when the time between keyframes is
|
|
inconsistent, but may make things worse on others, and can cause some oddities
|
|
during seeking. Defaults to @code{0}.
|
|
|
|
@item reset_timestamps @var{1|0}
|
|
Reset timestamps at the beginning of each segment, so that each segment
|
|
will start with near-zero timestamps. It is meant to ease the playback
|
|
of the generated segments. May not work with some combinations of
|
|
muxers/codecs. It is set to @code{0} by default.
|
|
|
|
@item initial_offset @var{offset}
|
|
Specify timestamp offset to apply to the output packet timestamps. The
|
|
argument must be a time duration specification, and defaults to 0.
|
|
|
|
@item write_empty_segments @var{1|0}
|
|
If enabled, write an empty segment if there are no packets during the period a
|
|
segment would usually span. Otherwise, the segment will be filled with the next
|
|
packet written. Defaults to @code{0}.
|
|
@end table
|
|
|
|
Make sure to require a closed GOP when encoding and to set the GOP
|
|
size to fit your segment time constraint.
|
|
|
|
@subsection Examples
|
|
|
|
@itemize
|
|
@item
|
|
Remux the content of file @file{in.mkv} to a list of segments
|
|
@file{out-000.nut}, @file{out-001.nut}, etc., and write the list of
|
|
generated segments to @file{out.list}:
|
|
@example
|
|
ffmpeg -i in.mkv -codec hevc -flags +cgop -g 60 -map 0 -f segment -segment_list out.list out%03d.nut
|
|
@end example
|
|
|
|
@item
|
|
Segment input and set output format options for the output segments:
|
|
@example
|
|
ffmpeg -i in.mkv -f segment -segment_time 10 -segment_format_options movflags=+faststart out%03d.mp4
|
|
@end example
|
|
|
|
@item
|
|
Segment the input file according to the split points specified by the
|
|
@var{segment_times} option:
|
|
@example
|
|
ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 out%03d.nut
|
|
@end example
|
|
|
|
@item
|
|
Use the @command{ffmpeg} @option{force_key_frames}
|
|
option to force key frames in the input at the specified location, together
|
|
with the segment option @option{segment_time_delta} to account for
|
|
possible roundings operated when setting key frame times.
|
|
@example
|
|
ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le -map 0 \
|
|
-f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut
|
|
@end example
|
|
In order to force key frames on the input file, transcoding is
|
|
required.
|
|
|
|
@item
|
|
Segment the input file by splitting the input file according to the
|
|
frame numbers sequence specified with the @option{segment_frames} option:
|
|
@example
|
|
ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_frames 100,200,300,500,800 out%03d.nut
|
|
@end example
|
|
|
|
@item
|
|
Convert the @file{in.mkv} to TS segments using the @code{libx264}
|
|
and @code{aac} encoders:
|
|
@example
|
|
ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segment_list out.list out%03d.ts
|
|
@end example
|
|
|
|
@item
|
|
Segment the input file, and create an M3U8 live playlist (can be used
|
|
as live HLS source):
|
|
@example
|
|
ffmpeg -re -i in.mkv -codec copy -map 0 -f segment -segment_list playlist.m3u8 \
|
|
-segment_list_flags +live -segment_time 10 out%03d.mkv
|
|
@end example
|
|
@end itemize
|
|
|
|
@section smoothstreaming
|
|
|
|
Smooth Streaming muxer generates a set of files (Manifest, chunks) suitable for serving with conventional web server.
|
|
|
|
@table @option
|
|
@item window_size
|
|
Specify the number of fragments kept in the manifest. Default 0 (keep all).
|
|
|
|
@item extra_window_size
|
|
Specify the number of fragments kept outside of the manifest before removing from disk. Default 5.
|
|
|
|
@item lookahead_count
|
|
Specify the number of lookahead fragments. Default 2.
|
|
|
|
@item min_frag_duration
|
|
Specify the minimum fragment duration (in microseconds). Default 5000000.
|
|
|
|
@item remove_at_exit
|
|
Specify whether to remove all fragments when finished. Default 0 (do not remove).
|
|
|
|
@end table
|
|
|
|
@anchor{fifo}
|
|
@section fifo
|
|
|
|
The fifo pseudo-muxer allows the separation of encoding and muxing by using
|
|
first-in-first-out queue and running the actual muxer in a separate thread. This
|
|
is especially useful in combination with the @ref{tee} muxer and can be used to
|
|
send data to several destinations with different reliability/writing speed/latency.
|
|
|
|
API users should be aware that callback functions (interrupt_callback,
|
|
io_open and io_close) used within its AVFormatContext must be thread-safe.
|
|
|
|
The behavior of the fifo muxer if the queue fills up or if the output fails is
|
|
selectable,
|
|
|
|
@itemize @bullet
|
|
|
|
@item
|
|
output can be transparently restarted with configurable delay between retries
|
|
based on real time or time of the processed stream.
|
|
|
|
@item
|
|
encoding can be blocked during temporary failure, or continue transparently
|
|
dropping packets in case fifo queue fills up.
|
|
|
|
@end itemize
|
|
|
|
@table @option
|
|
|
|
@item fifo_format
|
|
Specify the format name. Useful if it cannot be guessed from the
|
|
output name suffix.
|
|
|
|
@item queue_size
|
|
Specify size of the queue (number of packets). Default value is 60.
|
|
|
|
@item format_opts
|
|
Specify format options for the underlying muxer. Muxer options can be specified
|
|
as a list of @var{key}=@var{value} pairs separated by ':'.
|
|
|
|
@item drop_pkts_on_overflow @var{bool}
|
|
If set to 1 (true), in case the fifo queue fills up, packets will be dropped
|
|
rather than blocking the encoder. This makes it possible to continue streaming without
|
|
delaying the input, at the cost of omitting part of the stream. By default
|
|
this option is set to 0 (false), so in such cases the encoder will be blocked
|
|
until the muxer processes some of the packets and none of them is lost.
|
|
|
|
@item attempt_recovery @var{bool}
|
|
If failure occurs, attempt to recover the output. This is especially useful
|
|
when used with network output, since it makes it possible to restart streaming transparently.
|
|
By default this option is set to 0 (false).
|
|
|
|
@item max_recovery_attempts
|
|
Sets maximum number of successive unsuccessful recovery attempts after which
|
|
the output fails permanently. By default this option is set to 0 (unlimited).
|
|
|
|
@item recovery_wait_time @var{duration}
|
|
Waiting time before the next recovery attempt after previous unsuccessful
|
|
recovery attempt. Default value is 5 seconds.
|
|
|
|
@item recovery_wait_streamtime @var{bool}
|
|
If set to 0 (false), the real time is used when waiting for the recovery
|
|
attempt (i.e. the recovery will be attempted after at least
|
|
recovery_wait_time seconds).
|
|
If set to 1 (true), the time of the processed stream is taken into account
|
|
instead (i.e. the recovery will be attempted after at least @var{recovery_wait_time}
|
|
seconds of the stream is omitted).
|
|
By default, this option is set to 0 (false).
|
|
|
|
@item recover_any_error @var{bool}
|
|
If set to 1 (true), recovery will be attempted regardless of type of the error
|
|
causing the failure. By default this option is set to 0 (false) and in case of
|
|
certain (usually permanent) errors the recovery is not attempted even when
|
|
@var{attempt_recovery} is set to 1.
|
|
|
|
@item restart_with_keyframe @var{bool}
|
|
Specify whether to wait for the keyframe after recovering from
|
|
queue overflow or failure. This option is set to 0 (false) by default.
|
|
|
|
@end table
|
|
|
|
@subsection Examples
|
|
|
|
@itemize
|
|
|
|
@item
|
|
Stream something to rtmp server, continue processing the stream at real-time
|
|
rate even in case of temporary failure (network outage) and attempt to recover
|
|
streaming every second indefinitely.
|
|
@example
|
|
ffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifo_format flv -map 0:v -map 0:a
|
|
-drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 rtmp://example.com/live/stream_name
|
|
@end example
|
|
|
|
@end itemize
|
|
|
|
@anchor{tee}
|
|
@section tee
|
|
|
|
The tee muxer can be used to write the same data to several outputs, such as files or streams.
|
|
It can be used, for example, to stream a video over a network and save it to disk at the same time.
|
|
|
|
It is different from specifying several outputs to the @command{ffmpeg}
|
|
command-line tool. With the tee muxer, the audio and video data will be encoded only once.
|
|
With conventional multiple outputs, multiple encoding operations in parallel are initiated,
|
|
which can be a very expensive process. The tee muxer is not useful when using the libavformat API
|
|
directly because it is then possible to feed the same packets to several muxers directly.
|
|
|
|
Since the tee muxer does not represent any particular output format, ffmpeg cannot auto-select
|
|
output streams. So all streams intended for output must be specified using @code{-map}. See
|
|
the examples below.
|
|
|
|
Some encoders may need different options depending on the output format;
|
|
the auto-detection of this can not work with the tee muxer, so they need to be explicitly specified.
|
|
The main example is the @option{global_header} flag.
|
|
|
|
The slave outputs are specified in the file name given to the muxer,
|
|
separated by '|'. If any of the slave name contains the '|' separator,
|
|
leading or trailing spaces or any special character, those must be
|
|
escaped (see @ref{quoting_and_escaping,,the "Quoting and escaping"
|
|
section in the ffmpeg-utils(1) manual,ffmpeg-utils}).
|
|
|
|
@subsection Options
|
|
|
|
@table @option
|
|
|
|
@item use_fifo @var{bool}
|
|
If set to 1, slave outputs will be processed in separate threads using the @ref{fifo}
|
|
muxer. This allows to compensate for different speed/latency/reliability of
|
|
outputs and setup transparent recovery. By default this feature is turned off.
|
|
|
|
@item fifo_options
|
|
Options to pass to fifo pseudo-muxer instances. See @ref{fifo}.
|
|
|
|
@end table
|
|
|
|
Muxer options can be specified for each slave by prepending them as a list of
|
|
@var{key}=@var{value} pairs separated by ':', between square brackets. If
|
|
the options values contain a special character or the ':' separator, they
|
|
must be escaped; note that this is a second level escaping.
|
|
|
|
The following special options are also recognized:
|
|
@table @option
|
|
@item f
|
|
Specify the format name. Required if it cannot be guessed from the
|
|
output URL.
|
|
|
|
@item bsfs[/@var{spec}]
|
|
Specify a list of bitstream filters to apply to the specified
|
|
output.
|
|
|
|
It is possible to specify to which streams a given bitstream filter
|
|
applies, by appending a stream specifier to the option separated by
|
|
@code{/}. @var{spec} must be a stream specifier (see @ref{Format
|
|
stream specifiers}).
|
|
|
|
If the stream specifier is not specified, the bitstream filters will be
|
|
applied to all streams in the output. This will cause that output operation
|
|
to fail if the output contains streams to which the bitstream filter cannot
|
|
be applied e.g. @code{h264_mp4toannexb} being applied to an output containing an audio stream.
|
|
|
|
Options for a bitstream filter must be specified in the form of @code{opt=value}.
|
|
|
|
Several bitstream filters can be specified, separated by ",".
|
|
|
|
@item use_fifo @var{bool}
|
|
This allows to override tee muxer use_fifo option for individual slave muxer.
|
|
|
|
@item fifo_options
|
|
This allows to override tee muxer fifo_options for individual slave muxer.
|
|
See @ref{fifo}.
|
|
|
|
@item select
|
|
Select the streams that should be mapped to the slave output,
|
|
specified by a stream specifier. If not specified, this defaults to
|
|
all the mapped streams. This will cause that output operation to fail
|
|
if the output format does not accept all mapped streams.
|
|
|
|
You may use multiple stream specifiers separated by commas (@code{,}) e.g.: @code{a:0,v}
|
|
|
|
@item onfail
|
|
Specify behaviour on output failure. This can be set to either @code{abort} (which is
|
|
default) or @code{ignore}. @code{abort} will cause whole process to fail in case of failure
|
|
on this slave output. @code{ignore} will ignore failure on this output, so other outputs
|
|
will continue without being affected.
|
|
@end table
|
|
|
|
@subsection Examples
|
|
|
|
@itemize
|
|
@item
|
|
Encode something and both archive it in a WebM file and stream it
|
|
as MPEG-TS over UDP:
|
|
@example
|
|
ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
|
|
"archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
|
|
@end example
|
|
|
|
@item
|
|
As above, but continue streaming even if output to local file fails
|
|
(for example local drive fills up):
|
|
@example
|
|
ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
|
|
"[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
|
|
@end example
|
|
|
|
@item
|
|
Use @command{ffmpeg} to encode the input, and send the output
|
|
to three different destinations. The @code{dump_extra} bitstream
|
|
filter is used to add extradata information to all the output video
|
|
keyframes packets, as requested by the MPEG-TS format. The select
|
|
option is applied to @file{out.aac} in order to make it contain only
|
|
audio packets.
|
|
@example
|
|
ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
|
|
-f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"
|
|
@end example
|
|
|
|
@item
|
|
As above, but select only stream @code{a:1} for the audio output. Note
|
|
that a second level escaping must be performed, as ":" is a special
|
|
character used to separate options.
|
|
@example
|
|
ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
|
|
-f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"
|
|
@end example
|
|
@end itemize
|
|
|
|
@section webm_dash_manifest
|
|
|
|
WebM DASH Manifest muxer.
|
|
|
|
This muxer implements the WebM DASH Manifest specification to generate the DASH
|
|
manifest XML. It also supports manifest generation for DASH live streams.
|
|
|
|
For more information see:
|
|
|
|
@itemize @bullet
|
|
@item
|
|
WebM DASH Specification: @url{https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification}
|
|
@item
|
|
ISO DASH Specification: @url{http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip}
|
|
@end itemize
|
|
|
|
@subsection Options
|
|
|
|
This muxer supports the following options:
|
|
|
|
@table @option
|
|
@item adaptation_sets
|
|
This option has the following syntax: "id=x,streams=a,b,c id=y,streams=d,e" where x and y are the
|
|
unique identifiers of the adaptation sets and a,b,c,d and e are the indices of the corresponding
|
|
audio and video streams. Any number of adaptation sets can be added using this option.
|
|
|
|
@item live
|
|
Set this to 1 to create a live stream DASH Manifest. Default: 0.
|
|
|
|
@item chunk_start_index
|
|
Start index of the first chunk. This will go in the @samp{startNumber} attribute
|
|
of the @samp{SegmentTemplate} element in the manifest. Default: 0.
|
|
|
|
@item chunk_duration_ms
|
|
Duration of each chunk in milliseconds. This will go in the @samp{duration}
|
|
attribute of the @samp{SegmentTemplate} element in the manifest. Default: 1000.
|
|
|
|
@item utc_timing_url
|
|
URL of the page that will return the UTC timestamp in ISO format. This will go
|
|
in the @samp{value} attribute of the @samp{UTCTiming} element in the manifest.
|
|
Default: None.
|
|
|
|
@item time_shift_buffer_depth
|
|
Smallest time (in seconds) shifting buffer for which any Representation is
|
|
guaranteed to be available. This will go in the @samp{timeShiftBufferDepth}
|
|
attribute of the @samp{MPD} element. Default: 60.
|
|
|
|
@item minimum_update_period
|
|
Minimum update period (in seconds) of the manifest. This will go in the
|
|
@samp{minimumUpdatePeriod} attribute of the @samp{MPD} element. Default: 0.
|
|
|
|
@end table
|
|
|
|
@subsection Example
|
|
@example
|
|
ffmpeg -f webm_dash_manifest -i video1.webm \
|
|
-f webm_dash_manifest -i video2.webm \
|
|
-f webm_dash_manifest -i audio1.webm \
|
|
-f webm_dash_manifest -i audio2.webm \
|
|
-map 0 -map 1 -map 2 -map 3 \
|
|
-c copy \
|
|
-f webm_dash_manifest \
|
|
-adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
|
|
manifest.xml
|
|
@end example
|
|
|
|
@section webm_chunk
|
|
|
|
WebM Live Chunk Muxer.
|
|
|
|
This muxer writes out WebM headers and chunks as separate files which can be
|
|
consumed by clients that support WebM Live streams via DASH.
|
|
|
|
@subsection Options
|
|
|
|
This muxer supports the following options:
|
|
|
|
@table @option
|
|
@item chunk_start_index
|
|
Index of the first chunk (defaults to 0).
|
|
|
|
@item header
|
|
Filename of the header where the initialization data will be written.
|
|
|
|
@item audio_chunk_duration
|
|
Duration of each audio chunk in milliseconds (defaults to 5000).
|
|
@end table
|
|
|
|
@subsection Example
|
|
@example
|
|
ffmpeg -f v4l2 -i /dev/video0 \
|
|
-f alsa -i hw:0 \
|
|
-map 0:0 \
|
|
-c:v libvpx-vp9 \
|
|
-s 640x360 -keyint_min 30 -g 30 \
|
|
-f webm_chunk \
|
|
-header webm_live_video_360.hdr \
|
|
-chunk_start_index 1 \
|
|
webm_live_video_360_%d.chk \
|
|
-map 1:0 \
|
|
-c:a libvorbis \
|
|
-b:a 128k \
|
|
-f webm_chunk \
|
|
-header webm_live_audio_128.hdr \
|
|
-chunk_start_index 1 \
|
|
-audio_chunk_duration 1000 \
|
|
webm_live_audio_128_%d.chk
|
|
@end example
|
|
|
|
@c man end MUXERS
|