mirror of https://git.videolan.org/git/ffmpeg.git
doc/filters: put vidstab filters documentation in a sensible order
This commit is contained in:
Stefano Sabatini
parent
cb23de1904
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437
doc/filters.texi
437
doc/filters.texi
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@ -5306,140 +5306,6 @@ much, but it will increase the amount of blurring needed to cover over
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the image and will destroy more information than necessary, and extra
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pixels will slow things down on a large logo.
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@anchor{vidstabtransform}
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@section vidstabtransform
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Video stabilization/deshaking: pass 2 of 2,
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see @ref{vidstabdetect} for pass 1.
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Read a file with transform information for each frame and
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apply/compensate them. Together with the @ref{vidstabdetect}
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filter this can be used to deshake videos. See also
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@url{http://public.hronopik.de/vid.stab}. It is important to also use
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the unsharp filter, see below.
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To enable compilation of this filter you need to configure FFmpeg with
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@code{--enable-libvidstab}.
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This filter accepts the following options:
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@table @option
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@item input
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path to the file used to read the transforms (default: @file{transforms.trf})
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@item smoothing
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number of frames (value*2 + 1) used for lowpass filtering the camera movements
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(default: 10). For example a number of 10 means that 21 frames are used
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(10 in the past and 10 in the future) to smoothen the motion in the
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video. A larger values leads to a smoother video, but limits the
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acceleration of the camera (pan/tilt movements).
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@item maxshift
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maximal number of pixels to translate frames (default: -1 no limit)
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@item maxangle
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maximal angle in radians (degree*PI/180) to rotate frames (default: -1
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no limit)
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@item crop
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How to deal with borders that may be visible due to movement
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compensation. Available values are:
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@table @samp
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@item keep
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keep image information from previous frame (default)
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@item black
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fill the border black
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@end table
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@item invert
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@table @samp
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@item 0
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keep transforms normal (default)
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@item 1
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invert transforms
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@end table
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@item relative
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consider transforms as
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@table @samp
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@item 0
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absolute
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@item 1
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relative to previous frame (default)
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@end table
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@item zoom
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percentage to zoom (default: 0)
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@table @samp
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@item >0
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zoom in
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@item <0
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zoom out
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@end table
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@item optzoom
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if 1 then optimal zoom value is determined (default).
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Optimal zoom means no (or only little) border should be visible.
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Note that the value given at zoom is added to the one calculated
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here.
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@item interpol
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type of interpolation
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Available values are:
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@table @samp
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@item no
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no interpolation
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@item linear
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linear only horizontal
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@item bilinear
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linear in both directions (default)
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@item bicubic
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cubic in both directions (slow)
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@end table
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@item tripod
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virtual tripod mode means that the video is stabilized such that the
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camera stays stationary. Use also @code{tripod} option of
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@ref{vidstabdetect}.
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@table @samp
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@item 0
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off (default)
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@item 1
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virtual tripod mode: equivalent to @code{relative=0:smoothing=0}
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@end table
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@end table
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@subsection Examples
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@itemize
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@item
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typical call with default default values:
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(note the unsharp filter which is always recommended)
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@example
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ffmpeg -i inp.mpeg -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 inp_stabilized.mpeg
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@end example
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@item
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zoom in a bit more and load transform data from a given file
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@example
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vidstabtransform=zoom=5:input="mytransforms.trf"
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@end example
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@item
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smoothen the video even more
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@example
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vidstabtransform=smoothing=30
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@end example
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@end itemize
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@section scale
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Scale (resize) the input video, using the libswscale library.
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@ -5838,92 +5704,6 @@ in [-30,0] will filter edges. Default value is 0.
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If a chroma option is not explicitly set, the corresponding luma value
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is set.
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@anchor{vidstabdetect}
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@section vidstabdetect
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Video stabilization/deshaking: pass 1 of 2, see @ref{vidstabtransform}
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for pass 2.
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Generates a file with relative transform information translation,
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rotation about subsequent frames.
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To enable compilation of this filter you need to configure FFmpeg with
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@code{--enable-libvidstab}.
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This filter accepts the following options:
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@table @option
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@item result
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path to the file used to write the transforms (default:@file{transforms.trf})
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@item shakiness
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how shaky is the video and how quick is the camera? (default: 5)
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@table @samp
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@item 1
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little (fast)
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@item ...
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@item 10
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very strong/quick (slow)
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@end table
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@item accuracy
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accuracy of detection process (>=shakiness) (default: 9)
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@table @samp
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@item 1
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low (fast)
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@item 15
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high (slow)
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@end table
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@item stepsize
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stepsize of search process, region around minimum is scanned with 1 pixel
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resolution (default: 6)
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@item mincontrast
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below this contrast a local measurement field is discarded (0-1) (default: 0.3)
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@item tripod
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virtual tripod mode: @code{tripod=framenum} if framenum>0 otherwise disabled.
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The motion of the frames is compared to a reference frame (framenum).
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The idea is to compensate all movements in a more-or-less static scene
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and keep the camera view absolutely still.
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(default: 0 (disabled))
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@item show
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draw nothing (default); 1,2: show fields and transforms in the resulting frames
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@end table
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@subsection Examples
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@itemize
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@item
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use default values:
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@example
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vidstabdetect
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@end example
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@item
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strongly shaky movie and put the results in @code{mytransforms.trf}
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@example
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vidstabdetect=shakiness=10:accuracy=15:result="mytransforms.trf"
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@end example
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@item
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visualize some internals in the resulting video
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@example
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vidstabdetect=show=1
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@end example
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@item
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Typical call with visualization
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@example
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ffmpeg -i input -vf vidstabdetect=shakiness=5:show=1 dummy.avi
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@end example
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@end itemize
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@section stereo3d
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Convert between different stereoscopic image formats.
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@ -6438,6 +6218,223 @@ unsharp=7:7:-2:7:7:-2
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@end example
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@end itemize
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@anchor{vidstabdetect}
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@section vidstabdetect
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Video stabilization/deshaking: pass 1 of 2, see @ref{vidstabtransform}
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for pass 2.
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Generates a file with relative transform information translation,
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rotation about subsequent frames.
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To enable compilation of this filter you need to configure FFmpeg with
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@code{--enable-libvidstab}.
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This filter accepts the following options:
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@table @option
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@item result
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path to the file used to write the transforms (default:@file{transforms.trf})
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@item shakiness
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how shaky is the video and how quick is the camera? (default: 5)
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@table @samp
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@item 1
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little (fast)
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@item ...
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@item 10
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very strong/quick (slow)
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@end table
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@item accuracy
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accuracy of detection process (>=shakiness) (default: 9)
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@table @samp
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@item 1
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low (fast)
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@item 15
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high (slow)
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@end table
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@item stepsize
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stepsize of search process, region around minimum is scanned with 1 pixel
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resolution (default: 6)
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@item mincontrast
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below this contrast a local measurement field is discarded (0-1) (default: 0.3)
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@item tripod
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virtual tripod mode: @code{tripod=framenum} if framenum>0 otherwise disabled.
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The motion of the frames is compared to a reference frame (framenum).
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The idea is to compensate all movements in a more-or-less static scene
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and keep the camera view absolutely still.
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(default: 0 (disabled))
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@item show
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draw nothing (default); 1,2: show fields and transforms in the resulting frames
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@end table
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@subsection Examples
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@itemize
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@item
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use default values:
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@example
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vidstabdetect
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@end example
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@item
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strongly shaky movie and put the results in @code{mytransforms.trf}
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@example
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vidstabdetect=shakiness=10:accuracy=15:result="mytransforms.trf"
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@end example
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@item
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visualize some internals in the resulting video
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@example
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vidstabdetect=show=1
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@end example
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@item
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Typical call with visualization
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@example
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ffmpeg -i input -vf vidstabdetect=shakiness=5:show=1 dummy.avi
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@end example
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@end itemize
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@anchor{vidstabtransform}
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@section vidstabtransform
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Video stabilization/deshaking: pass 2 of 2,
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see @ref{vidstabdetect} for pass 1.
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Read a file with transform information for each frame and
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apply/compensate them. Together with the @ref{vidstabdetect}
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filter this can be used to deshake videos. See also
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@url{http://public.hronopik.de/vid.stab}. It is important to also use
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the unsharp filter, see below.
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To enable compilation of this filter you need to configure FFmpeg with
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@code{--enable-libvidstab}.
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This filter accepts the following options:
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@table @option
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@item input
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path to the file used to read the transforms (default: @file{transforms.trf})
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@item smoothing
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number of frames (value*2 + 1) used for lowpass filtering the camera movements
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(default: 10). For example a number of 10 means that 21 frames are used
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(10 in the past and 10 in the future) to smoothen the motion in the
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video. A larger values leads to a smoother video, but limits the
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acceleration of the camera (pan/tilt movements).
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@item maxshift
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maximal number of pixels to translate frames (default: -1 no limit)
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@item maxangle
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maximal angle in radians (degree*PI/180) to rotate frames (default: -1
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no limit)
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@item crop
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How to deal with borders that may be visible due to movement
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compensation. Available values are:
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@table @samp
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@item keep
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keep image information from previous frame (default)
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@item black
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fill the border black
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@end table
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@item invert
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@table @samp
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@item 0
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keep transforms normal (default)
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@item 1
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invert transforms
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@end table
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@item relative
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consider transforms as
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@table @samp
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@item 0
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absolute
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@item 1
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relative to previous frame (default)
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@end table
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@item zoom
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percentage to zoom (default: 0)
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@table @samp
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@item >0
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zoom in
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@item <0
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zoom out
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@end table
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@item optzoom
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if 1 then optimal zoom value is determined (default).
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Optimal zoom means no (or only little) border should be visible.
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Note that the value given at zoom is added to the one calculated
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here.
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@item interpol
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type of interpolation
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Available values are:
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@table @samp
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@item no
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no interpolation
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@item linear
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linear only horizontal
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@item bilinear
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linear in both directions (default)
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@item bicubic
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cubic in both directions (slow)
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@end table
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@item tripod
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virtual tripod mode means that the video is stabilized such that the
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camera stays stationary. Use also @code{tripod} option of
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||||
@ref{vidstabdetect}.
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@table @samp
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@item 0
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off (default)
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@item 1
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virtual tripod mode: equivalent to @code{relative=0:smoothing=0}
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@end table
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@end table
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@subsection Examples
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@itemize
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@item
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typical call with default default values:
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(note the unsharp filter which is always recommended)
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@example
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ffmpeg -i inp.mpeg -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 inp_stabilized.mpeg
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@end example
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@item
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zoom in a bit more and load transform data from a given file
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@example
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vidstabtransform=zoom=5:input="mytransforms.trf"
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@end example
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@item
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smoothen the video even more
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@example
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vidstabtransform=smoothing=30
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@end example
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@end itemize
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@section vflip
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Flip the input video vertically.
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