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743 lines
21 KiB
Plaintext
743 lines
21 KiB
Plaintext
@chapter Bitstream Filters
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@c man begin BITSTREAM FILTERS
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When you configure your FFmpeg build, all the supported bitstream
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filters are enabled by default. You can list all available ones using
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the configure option @code{--list-bsfs}.
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You can disable all the bitstream filters using the configure option
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@code{--disable-bsfs}, and selectively enable any bitstream filter using
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the option @code{--enable-bsf=BSF}, or you can disable a particular
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bitstream filter using the option @code{--disable-bsf=BSF}.
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The option @code{-bsfs} of the ff* tools will display the list of
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all the supported bitstream filters included in your build.
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The ff* tools have a -bsf option applied per stream, taking a
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comma-separated list of filters, whose parameters follow the filter
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name after a '='.
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@example
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ffmpeg -i INPUT -c:v copy -bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT
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@end example
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Below is a description of the currently available bitstream filters,
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with their parameters, if any.
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@section aac_adtstoasc
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Convert MPEG-2/4 AAC ADTS to an MPEG-4 Audio Specific Configuration
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bitstream.
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This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
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ADTS header and removes the ADTS header.
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This filter is required for example when copying an AAC stream from a
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raw ADTS AAC or an MPEG-TS container to MP4A-LATM, to an FLV file, or
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to MOV/MP4 files and related formats such as 3GP or M4A. Please note
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that it is auto-inserted for MP4A-LATM and MOV/MP4 and related formats.
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@section av1_metadata
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Modify metadata embedded in an AV1 stream.
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@table @option
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@item td
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Insert or remove temporal delimiter OBUs in all temporal units of the
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stream.
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@table @samp
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@item insert
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Insert a TD at the beginning of every TU which does not already have one.
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@item remove
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Remove the TD from the beginning of every TU which has one.
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@end table
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@item color_primaries
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@item transfer_characteristics
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@item matrix_coefficients
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Set the color description fields in the stream (see AV1 section 6.4.2).
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@item color_range
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Set the color range in the stream (see AV1 section 6.4.2; note that
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this cannot be set for streams using BT.709 primaries, sRGB transfer
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characteristic and identity (RGB) matrix coefficients).
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@table @samp
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@item tv
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Limited range.
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@item pc
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Full range.
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@end table
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@item chroma_sample_position
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Set the chroma sample location in the stream (see AV1 section 6.4.2).
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This can only be set for 4:2:0 streams.
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@table @samp
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@item vertical
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Left position (matching the default in MPEG-2 and H.264).
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@item colocated
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Top-left position.
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@end table
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@item tick_rate
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Set the tick rate (@emph{num_units_in_display_tick / time_scale}) in
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the timing info in the sequence header.
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@item num_ticks_per_picture
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Set the number of ticks in each picture, to indicate that the stream
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has a fixed framerate. Ignored if @option{tick_rate} is not also set.
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@item delete_padding
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Deletes Padding OBUs.
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@end table
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@section chomp
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Remove zero padding at the end of a packet.
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@section dca_core
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Extract the core from a DCA/DTS stream, dropping extensions such as
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DTS-HD.
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@section dump_extra
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Add extradata to the beginning of the filtered packets except when
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said packets already exactly begin with the extradata that is intended
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to be added.
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@table @option
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@item freq
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The additional argument specifies which packets should be filtered.
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It accepts the values:
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@table @samp
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@item k
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@item keyframe
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add extradata to all key packets
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@item e
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@item all
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add extradata to all packets
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@end table
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@end table
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If not specified it is assumed @samp{k}.
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For example the following @command{ffmpeg} command forces a global
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header (thus disabling individual packet headers) in the H.264 packets
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generated by the @code{libx264} encoder, but corrects them by adding
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the header stored in extradata to the key packets:
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@example
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ffmpeg -i INPUT -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra out.ts
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@end example
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@section eac3_core
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Extract the core from a E-AC-3 stream, dropping extra channels.
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@section extract_extradata
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Extract the in-band extradata.
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Certain codecs allow the long-term headers (e.g. MPEG-2 sequence headers,
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or H.264/HEVC (VPS/)SPS/PPS) to be transmitted either "in-band" (i.e. as a part
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of the bitstream containing the coded frames) or "out of band" (e.g. on the
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container level). This latter form is called "extradata" in FFmpeg terminology.
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This bitstream filter detects the in-band headers and makes them available as
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extradata.
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@table @option
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@item remove
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When this option is enabled, the long-term headers are removed from the
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bitstream after extraction.
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@end table
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@section filter_units
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Remove units with types in or not in a given set from the stream.
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@table @option
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@item pass_types
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List of unit types or ranges of unit types to pass through while removing
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all others. This is specified as a '|'-separated list of unit type values
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or ranges of values with '-'.
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@item remove_types
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Identical to @option{pass_types}, except the units in the given set
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removed and all others passed through.
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@end table
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Extradata is unchanged by this transformation, but note that if the stream
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contains inline parameter sets then the output may be unusable if they are
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removed.
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For example, to remove all non-VCL NAL units from an H.264 stream:
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@example
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ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=pass_types=1-5' OUTPUT
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@end example
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To remove all AUDs, SEI and filler from an H.265 stream:
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@example
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ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT
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@end example
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@section hapqa_extract
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Extract Rgb or Alpha part of an HAPQA file, without recompression, in order to create an HAPQ or an HAPAlphaOnly file.
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@table @option
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@item texture
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Specifies the texture to keep.
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@table @option
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@item color
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@item alpha
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@end table
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@end table
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Convert HAPQA to HAPQ
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@example
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ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=color -tag:v HapY -metadata:s:v:0 encoder="HAPQ" hapq_file.mov
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@end example
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Convert HAPQA to HAPAlphaOnly
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@example
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ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=alpha -tag:v HapA -metadata:s:v:0 encoder="HAPAlpha Only" hapalphaonly_file.mov
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@end example
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@section h264_metadata
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Modify metadata embedded in an H.264 stream.
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@table @option
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@item aud
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Insert or remove AUD NAL units in all access units of the stream.
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@table @samp
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@item insert
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@item remove
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@end table
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@item sample_aspect_ratio
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Set the sample aspect ratio of the stream in the VUI parameters.
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@item overscan_appropriate_flag
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Set whether the stream is suitable for display using overscan
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or not (see H.264 section E.2.1).
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@item video_format
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@item video_full_range_flag
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Set the video format in the stream (see H.264 section E.2.1 and
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table E-2).
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@item colour_primaries
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@item transfer_characteristics
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@item matrix_coefficients
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Set the colour description in the stream (see H.264 section E.2.1
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and tables E-3, E-4 and E-5).
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@item chroma_sample_loc_type
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Set the chroma sample location in the stream (see H.264 section
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E.2.1 and figure E-1).
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@item tick_rate
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Set the tick rate (num_units_in_tick / time_scale) in the VUI
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parameters. This is the smallest time unit representable in the
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stream, and in many cases represents the field rate of the stream
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(double the frame rate).
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@item fixed_frame_rate_flag
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Set whether the stream has fixed framerate - typically this indicates
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that the framerate is exactly half the tick rate, but the exact
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meaning is dependent on interlacing and the picture structure (see
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H.264 section E.2.1 and table E-6).
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@item crop_left
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@item crop_right
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@item crop_top
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@item crop_bottom
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Set the frame cropping offsets in the SPS. These values will replace
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the current ones if the stream is already cropped.
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These fields are set in pixels. Note that some sizes may not be
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representable if the chroma is subsampled or the stream is interlaced
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(see H.264 section 7.4.2.1.1).
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@item sei_user_data
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Insert a string as SEI unregistered user data. The argument must
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be of the form @emph{UUID+string}, where the UUID is as hex digits
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possibly separated by hyphens, and the string can be anything.
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For example, @samp{086f3693-b7b3-4f2c-9653-21492feee5b8+hello} will
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insert the string ``hello'' associated with the given UUID.
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@item delete_filler
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Deletes both filler NAL units and filler SEI messages.
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@item level
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Set the level in the SPS. Refer to H.264 section A.3 and tables A-1
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to A-5.
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The argument must be the name of a level (for example, @samp{4.2}), a
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level_idc value (for example, @samp{42}), or the special name @samp{auto}
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indicating that the filter should attempt to guess the level from the
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input stream properties.
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@end table
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@section h264_mp4toannexb
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Convert an H.264 bitstream from length prefixed mode to start code
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prefixed mode (as defined in the Annex B of the ITU-T H.264
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specification).
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This is required by some streaming formats, typically the MPEG-2
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transport stream format (muxer @code{mpegts}).
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For example to remux an MP4 file containing an H.264 stream to mpegts
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format with @command{ffmpeg}, you can use the command:
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@example
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ffmpeg -i INPUT.mp4 -codec copy -bsf:v h264_mp4toannexb OUTPUT.ts
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@end example
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Please note that this filter is auto-inserted for MPEG-TS (muxer
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@code{mpegts}) and raw H.264 (muxer @code{h264}) output formats.
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@section h264_redundant_pps
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This applies a specific fixup to some Blu-ray streams which contain
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redundant PPSs modifying irrelevant parameters of the stream which
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confuse other transformations which require correct extradata.
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A new single global PPS is created, and all of the redundant PPSs
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within the stream are removed.
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@section hevc_metadata
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Modify metadata embedded in an HEVC stream.
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@table @option
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@item aud
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Insert or remove AUD NAL units in all access units of the stream.
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@table @samp
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@item insert
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@item remove
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@end table
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@item sample_aspect_ratio
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Set the sample aspect ratio in the stream in the VUI parameters.
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@item video_format
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@item video_full_range_flag
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Set the video format in the stream (see H.265 section E.3.1 and
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table E.2).
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@item colour_primaries
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@item transfer_characteristics
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@item matrix_coefficients
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Set the colour description in the stream (see H.265 section E.3.1
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and tables E.3, E.4 and E.5).
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@item chroma_sample_loc_type
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Set the chroma sample location in the stream (see H.265 section
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E.3.1 and figure E.1).
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@item tick_rate
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Set the tick rate in the VPS and VUI parameters (num_units_in_tick /
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time_scale). Combined with @option{num_ticks_poc_diff_one}, this can
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set a constant framerate in the stream. Note that it is likely to be
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overridden by container parameters when the stream is in a container.
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@item num_ticks_poc_diff_one
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Set poc_proportional_to_timing_flag in VPS and VUI and use this value
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to set num_ticks_poc_diff_one_minus1 (see H.265 sections 7.4.3.1 and
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E.3.1). Ignored if @option{tick_rate} is not also set.
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@item crop_left
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@item crop_right
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@item crop_top
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@item crop_bottom
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Set the conformance window cropping offsets in the SPS. These values
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will replace the current ones if the stream is already cropped.
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These fields are set in pixels. Note that some sizes may not be
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representable if the chroma is subsampled (H.265 section 7.4.3.2.1).
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@item level
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Set the level in the VPS and SPS. See H.265 section A.4 and tables
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A.6 and A.7.
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The argument must be the name of a level (for example, @samp{5.1}), a
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@emph{general_level_idc} value (for example, @samp{153} for level 5.1),
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or the special name @samp{auto} indicating that the filter should
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attempt to guess the level from the input stream properties.
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@end table
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@section hevc_mp4toannexb
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Convert an HEVC/H.265 bitstream from length prefixed mode to start code
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prefixed mode (as defined in the Annex B of the ITU-T H.265
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specification).
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This is required by some streaming formats, typically the MPEG-2
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transport stream format (muxer @code{mpegts}).
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For example to remux an MP4 file containing an HEVC stream to mpegts
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format with @command{ffmpeg}, you can use the command:
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@example
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ffmpeg -i INPUT.mp4 -codec copy -bsf:v hevc_mp4toannexb OUTPUT.ts
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@end example
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Please note that this filter is auto-inserted for MPEG-TS (muxer
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@code{mpegts}) and raw HEVC/H.265 (muxer @code{h265} or
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@code{hevc}) output formats.
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@section imxdump
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Modifies the bitstream to fit in MOV and to be usable by the Final Cut
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Pro decoder. This filter only applies to the mpeg2video codec, and is
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likely not needed for Final Cut Pro 7 and newer with the appropriate
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@option{-tag:v}.
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For example, to remux 30 MB/sec NTSC IMX to MOV:
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@example
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ffmpeg -i input.mxf -c copy -bsf:v imxdump -tag:v mx3n output.mov
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@end example
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@section mjpeg2jpeg
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Convert MJPEG/AVI1 packets to full JPEG/JFIF packets.
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MJPEG is a video codec wherein each video frame is essentially a
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JPEG image. The individual frames can be extracted without loss,
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e.g. by
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@example
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ffmpeg -i ../some_mjpeg.avi -c:v copy frames_%d.jpg
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@end example
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Unfortunately, these chunks are incomplete JPEG images, because
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they lack the DHT segment required for decoding. Quoting from
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@url{http://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml}:
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Avery Lee, writing in the rec.video.desktop newsgroup in 2001,
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commented that "MJPEG, or at least the MJPEG in AVIs having the
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MJPG fourcc, is restricted JPEG with a fixed -- and *omitted* --
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Huffman table. The JPEG must be YCbCr colorspace, it must be 4:2:2,
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and it must use basic Huffman encoding, not arithmetic or
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progressive. . . . You can indeed extract the MJPEG frames and
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decode them with a regular JPEG decoder, but you have to prepend
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the DHT segment to them, or else the decoder won't have any idea
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how to decompress the data. The exact table necessary is given in
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the OpenDML spec."
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This bitstream filter patches the header of frames extracted from an MJPEG
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stream (carrying the AVI1 header ID and lacking a DHT segment) to
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produce fully qualified JPEG images.
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@example
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ffmpeg -i mjpeg-movie.avi -c:v copy -bsf:v mjpeg2jpeg frame_%d.jpg
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exiftran -i -9 frame*.jpg
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ffmpeg -i frame_%d.jpg -c:v copy rotated.avi
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@end example
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@section mjpegadump
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Add an MJPEG A header to the bitstream, to enable decoding by
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Quicktime.
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@anchor{mov2textsub}
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@section mov2textsub
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Extract a representable text file from MOV subtitles, stripping the
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metadata header from each subtitle packet.
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See also the @ref{text2movsub} filter.
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@section mp3decomp
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Decompress non-standard compressed MP3 audio headers.
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@section mpeg2_metadata
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Modify metadata embedded in an MPEG-2 stream.
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@table @option
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@item display_aspect_ratio
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Set the display aspect ratio in the stream.
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The following fixed values are supported:
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@table @option
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@item 4/3
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@item 16/9
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@item 221/100
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@end table
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Any other value will result in square pixels being signalled instead
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(see H.262 section 6.3.3 and table 6-3).
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@item frame_rate
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Set the frame rate in the stream. This is constructed from a table
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of known values combined with a small multiplier and divisor - if
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the supplied value is not exactly representable, the nearest
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representable value will be used instead (see H.262 section 6.3.3
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and table 6-4).
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@item video_format
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Set the video format in the stream (see H.262 section 6.3.6 and
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table 6-6).
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@item colour_primaries
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@item transfer_characteristics
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@item matrix_coefficients
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Set the colour description in the stream (see H.262 section 6.3.6
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and tables 6-7, 6-8 and 6-9).
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@end table
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@section mpeg4_unpack_bframes
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Unpack DivX-style packed B-frames.
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DivX-style packed B-frames are not valid MPEG-4 and were only a
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workaround for the broken Video for Windows subsystem.
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They use more space, can cause minor AV sync issues, require more
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CPU power to decode (unless the player has some decoded picture queue
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to compensate the 2,0,2,0 frame per packet style) and cause
|
|
trouble if copied into a standard container like mp4 or mpeg-ps/ts,
|
|
because MPEG-4 decoders may not be able to decode them, since they are
|
|
not valid MPEG-4.
|
|
|
|
For example to fix an AVI file containing an MPEG-4 stream with
|
|
DivX-style packed B-frames using @command{ffmpeg}, you can use the command:
|
|
|
|
@example
|
|
ffmpeg -i INPUT.avi -codec copy -bsf:v mpeg4_unpack_bframes OUTPUT.avi
|
|
@end example
|
|
|
|
@section noise
|
|
|
|
Damages the contents of packets or simply drops them without damaging the
|
|
container. Can be used for fuzzing or testing error resilience/concealment.
|
|
|
|
Parameters:
|
|
@table @option
|
|
@item amount
|
|
A numeral string, whose value is related to how often output bytes will
|
|
be modified. Therefore, values below or equal to 0 are forbidden, and
|
|
the lower the more frequent bytes will be modified, with 1 meaning
|
|
every byte is modified.
|
|
@item dropamount
|
|
A numeral string, whose value is related to how often packets will be dropped.
|
|
Therefore, values below or equal to 0 are forbidden, and the lower the more
|
|
frequent packets will be dropped, with 1 meaning every packet is dropped.
|
|
@end table
|
|
|
|
The following example applies the modification to every byte but does not drop
|
|
any packets.
|
|
@example
|
|
ffmpeg -i INPUT -c copy -bsf noise[=1] output.mkv
|
|
@end example
|
|
|
|
@section null
|
|
This bitstream filter passes the packets through unchanged.
|
|
|
|
@section pcm_rechunk
|
|
|
|
Repacketize PCM audio to a fixed number of samples per packet or a fixed packet
|
|
rate per second. This is similar to the @ref{asetnsamples,,asetnsamples audio
|
|
filter,ffmpeg-filters} but works on audio packets instead of audio frames.
|
|
|
|
@table @option
|
|
@item nb_out_samples, n
|
|
Set the number of samples per each output audio packet. The number is intended
|
|
as the number of samples @emph{per each channel}. Default value is 1024.
|
|
|
|
@item pad, p
|
|
If set to 1, the filter will pad the last audio packet with silence, so that it
|
|
will contain the same number of samples (or roughly the same number of samples,
|
|
see @option{frame_rate}) as the previous ones. Default value is 1.
|
|
|
|
@item frame_rate, r
|
|
This option makes the filter output a fixed number of packets per second instead
|
|
of a fixed number of samples per packet. If the audio sample rate is not
|
|
divisible by the frame rate then the number of samples will not be constant but
|
|
will vary slightly so that each packet will start as close to the frame
|
|
boundary as possible. Using this option has precedence over @option{nb_out_samples}.
|
|
@end table
|
|
|
|
You can generate the well known 1602-1601-1602-1601-1602 pattern of 48kHz audio
|
|
for NTSC frame rate using the @option{frame_rate} option.
|
|
@example
|
|
ffmpeg -f lavfi -i sine=r=48000:d=1 -c pcm_s16le -bsf pcm_rechunk=r=30000/1001 -f framecrc -
|
|
@end example
|
|
|
|
@section prores_metadata
|
|
|
|
Modify color property metadata embedded in prores stream.
|
|
|
|
@table @option
|
|
@item color_primaries
|
|
Set the color primaries.
|
|
Available values are:
|
|
|
|
@table @samp
|
|
@item auto
|
|
Keep the same color primaries property (default).
|
|
|
|
@item unknown
|
|
@item bt709
|
|
@item bt470bg
|
|
BT601 625
|
|
|
|
@item smpte170m
|
|
BT601 525
|
|
|
|
@item bt2020
|
|
@item smpte431
|
|
DCI P3
|
|
|
|
@item smpte432
|
|
P3 D65
|
|
|
|
@end table
|
|
|
|
@item transfer_characteristics
|
|
Set the color transfer.
|
|
Available values are:
|
|
|
|
@table @samp
|
|
@item auto
|
|
Keep the same transfer characteristics property (default).
|
|
|
|
@item unknown
|
|
@item bt709
|
|
BT 601, BT 709, BT 2020
|
|
@item smpte2084
|
|
SMPTE ST 2084
|
|
@item arib-std-b67
|
|
ARIB STD-B67
|
|
@end table
|
|
|
|
|
|
@item matrix_coefficients
|
|
Set the matrix coefficient.
|
|
Available values are:
|
|
|
|
@table @samp
|
|
@item auto
|
|
Keep the same colorspace property (default).
|
|
|
|
@item unknown
|
|
@item bt709
|
|
@item smpte170m
|
|
BT 601
|
|
|
|
@item bt2020nc
|
|
@end table
|
|
@end table
|
|
|
|
Set Rec709 colorspace for each frame of the file
|
|
@example
|
|
ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709 output.mov
|
|
@end example
|
|
|
|
Set Hybrid Log-Gamma parameters for each frame of the file
|
|
@example
|
|
ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt2020:color_trc=arib-std-b67:colorspace=bt2020nc output.mov
|
|
@end example
|
|
|
|
@section remove_extra
|
|
|
|
Remove extradata from packets.
|
|
|
|
It accepts the following parameter:
|
|
@table @option
|
|
@item freq
|
|
Set which frame types to remove extradata from.
|
|
|
|
@table @samp
|
|
@item k
|
|
Remove extradata from non-keyframes only.
|
|
|
|
@item keyframe
|
|
Remove extradata from keyframes only.
|
|
|
|
@item e, all
|
|
Remove extradata from all frames.
|
|
|
|
@end table
|
|
@end table
|
|
|
|
@anchor{text2movsub}
|
|
@section text2movsub
|
|
|
|
Convert text subtitles to MOV subtitles (as used by the @code{mov_text}
|
|
codec) with metadata headers.
|
|
|
|
See also the @ref{mov2textsub} filter.
|
|
|
|
@section trace_headers
|
|
|
|
Log trace output containing all syntax elements in the coded stream
|
|
headers (everything above the level of individual coded blocks).
|
|
This can be useful for debugging low-level stream issues.
|
|
|
|
Supports AV1, H.264, H.265, (M)JPEG, MPEG-2 and VP9, but depending
|
|
on the build only a subset of these may be available.
|
|
|
|
@section truehd_core
|
|
|
|
Extract the core from a TrueHD stream, dropping ATMOS data.
|
|
|
|
@section vp9_metadata
|
|
|
|
Modify metadata embedded in a VP9 stream.
|
|
|
|
@table @option
|
|
@item color_space
|
|
Set the color space value in the frame header. Note that any frame
|
|
set to RGB will be implicitly set to PC range and that RGB is
|
|
incompatible with profiles 0 and 2.
|
|
@table @samp
|
|
@item unknown
|
|
@item bt601
|
|
@item bt709
|
|
@item smpte170
|
|
@item smpte240
|
|
@item bt2020
|
|
@item rgb
|
|
@end table
|
|
|
|
@item color_range
|
|
Set the color range value in the frame header. Note that any value
|
|
imposed by the color space will take precedence over this value.
|
|
@table @samp
|
|
@item tv
|
|
@item pc
|
|
@end table
|
|
@end table
|
|
|
|
@section vp9_superframe
|
|
|
|
Merge VP9 invisible (alt-ref) frames back into VP9 superframes. This
|
|
fixes merging of split/segmented VP9 streams where the alt-ref frame
|
|
was split from its visible counterpart.
|
|
|
|
@section vp9_superframe_split
|
|
|
|
Split VP9 superframes into single frames.
|
|
|
|
@section vp9_raw_reorder
|
|
|
|
Given a VP9 stream with correct timestamps but possibly out of order,
|
|
insert additional show-existing-frame packets to correct the ordering.
|
|
|
|
@c man end BITSTREAM FILTERS
|