Set LFO rate.
@end table
+@section adeclick
+Remove impulsive noise from input audio.
+
+Samples detected as impulsive noise are replaced by interpolated samples using
+autoregressive modelling.
+
+@table @option
+@item w
+Set window size, in milliseconds. Allowed range is from @code{10} to
+@code{100}. Default value is @code{55} milliseconds.
+This sets size of window which will be processed at once.
+
+@item o
+Set window overlap, in percentage of window size. Allowed range is from
+@code{50} to @code{95}. Default value is @code{75} percent.
+Setting this to a very high value increases impulsive noise removal but makes
+whole process much slower.
+
+@item a
+Set autoregression order, in percentage of window size. Allowed range is from
+@code{0} to @code{25}. Default value is @code{2} percent. This option also
+controls quality of interpolated samples using neighbour good samples.
+
+@item t
+Set threshold value. Allowed range is from @code{1} to @code{100}.
+Default value is @code{2}.
+This controls the strength of impulsive noise which is going to be removed.
+The lower value, the more samples will be detected as impulsive noise.
+
+@item b
+Set burst fusion, in percentage of window size. Allowed range is @code{0} to
+@code{10}. Default value is @code{2}.
+If any two samples deteced as noise are spaced less than this value then any
+sample inbetween those two samples will be also detected as noise.
+
+@item m
+Set overlap method.
+
+It accepts the following values:
+@table @option
+@item a
+Select overlap-add method. Even not interpolated samples are slightly
+changed with this method.
+
+@item s
+Select overlap-save method. Not interpolated samples remain unchanged.
+@end table
+
+Default value is @code{a}.
+@end table
+
+@section adeclip
+Remove clipped samples from input audio.
+
+Samples detected as clipped are replaced by interpolated samples using
+autoregressive modelling.
+
+@table @option
+@item w
+Set window size, in milliseconds. Allowed range is from @code{10} to @code{100}.
+Default value is @code{55} milliseconds.
+This sets size of window which will be processed at once.
+
+@item o
+Set window overlap, in percentage of window size. Allowed range is from @code{50}
+to @code{95}. Default value is @code{75} percent.
+
+@item a
+Set autoregression order, in percentage of window size. Allowed range is from
+@code{0} to @code{25}. Default value is @code{8} percent. This option also controls
+quality of interpolated samples using neighbour good samples.
+
+@item t
+Set threshold value. Allowed range is from @code{1} to @code{100}.
+Default value is @code{10}. Higher values make clip detection less aggressive.
+
+@item n
+Set size of histogram used to detect clips. Allowed range is from @code{100} to @code{9999}.
+Default value is @code{1000}. Higher values make clip detection less aggressive.
+
+@item m
+Set overlap method.
+
+It accepts the following values:
+@table @option
+@item a
+Select overlap-add method. Even not interpolated samples are slightly changed
+with this method.
+
+@item s
+Select overlap-save method. Not interpolated samples remain unchanged.
+@end table
+
+Default value is @code{a}.
+@end table
+
@section adelay
Delay one or more audio channels.
@end example
@end itemize
+@section aderivative, aintegral
+
+Compute derivative/integral of audio stream.
+
+Applying both filters one after another produces original audio.
+
@section aecho
Apply echoing to the input audio.
@item again
Enable applying gain measured from power of IR.
+
+@item maxir
+Set max allowed Impulse Response filter duration in seconds. Default is 30 seconds.
+Allowed range is 0.1 to 60 seconds.
+
+@item response
+Show IR frequency reponse, magnitude and phase in additional video stream.
+By default it is disabled.
+
+@item channel
+Set for which IR channel to display frequency response. By default is first channel
+displayed. This option is used only when @var{response} is enabled.
+
+@item size
+Set video stream size. This option is used only when @var{response} is enabled.
@end table
@subsection Examples
16-bit integers
@end table
+@item response
+Show IR frequency reponse, magnitude and phase in additional video stream.
+By default it is disabled.
+
+@item channel
+Set for which IR channel to display frequency response. By default is first channel
+displayed. This option is used only when @var{response} is enabled.
+
+@item size
+Set video stream size. This option is used only when @var{response} is enabled.
@end table
Coefficients in @code{tf} format are separated by spaces and are in ascending
Syntax for the command is : "@var{width}"
@end table
-@section bass
+@section bass, lowshelf
Boost or cut the bass (lower) frequencies of the audio using a two-pole
shelving filter with a response similar to that of a standard
@item lfe
Set custom gain for LFE channels. Value is in dB. Default is 0.
+
+@item size
+Set size of frame in number of samples which will be processed at once.
+Default value is @var{1024}. Allowed range is from 1024 to 96000.
+
+@item hrir
+Set format of hrir stream.
+Default value is @var{stereo}. Alternative value is @var{multich}.
+If value is set to @var{stereo}, number of additional streams should
+be greater or equal to number of input channels in first input stream.
+Also each additional stream should have stereo number of channels.
+If value is set to @var{multich}, number of additional streams should
+be exactly one. Also number of input channels of additional stream
+should be equal or greater than twice number of channels of first input
+stream.
@end table
@subsection Examples
ffmpeg -i input.wav -lavfi-complex "amovie=azi_270_ele_0_DFC.wav[sr],amovie=azi_90_ele_0_DFC.wav[sl],amovie=azi_225_ele_0_DFC.wav[br],amovie=azi_135_ele_0_DFC.wav[bl],amovie=azi_0_ele_0_DFC.wav,asplit[fc][lfe],amovie=azi_35_ele_0_DFC.wav[fl],amovie=azi_325_ele_0_DFC.wav[fr],[a:0][fl][fr][fc][lfe][bl][br][sl][sr]headphone=FL|FR|FC|LFE|BL|BR|SL|SR"
output.wav
@end example
+
+@item
+Full example using wav files as coefficients with amovie filters for 7.1 downmix,
+but now in @var{multich} @var{hrir} format.
+@example
+ffmpeg -i input.wav -lavfi-complex "amovie=minp.wav[hrirs],[a:0][hrirs]headphone=map=FL|FR|FC|LFE|BL|BR|SL|SR:hrir=multich"
+output.wav
+@end example
@end itemize
@section highpass
@section rubberband
Apply time-stretching and pitch-shifting with librubberband.
+To enable compilation of this filter, you need to configure FFmpeg with
+@code{--enable-librubberband}.
+
The filter accepts the following options:
@table @option
Set LFE output volume. By default, this is @var{1}.
@end table
-@section treble
+@section treble, highshelf
Boost or cut treble (upper) frequencies of the audio using a two-pole
shelving filter with a response similar to that of a standard
pipeline drops frames. If you're trying to apply an image as an
overlay to a video stream, consider the @var{overlay} filter instead.
+@section amplify
+
+Amplify differences between current pixel and pixels of adjacent frames in
+same pixel location.
+
+This filter accepts the following options:
+
+@table @option
+@item radius
+Set frame radius. Default is 2. Allowed range is from 1 to 63.
+For example radius of 3 will instruct filter to calculate average of 7 frames.
+
+@item factor
+Set factor to amplify difference. Default is 2. Allowed range is from 0 to 65535.
+
+@item threshold
+Set threshold for difference amplification. Any differrence greater or equal to
+this value will not alter source pixel. Default is 10.
+Allowed range is from 0 to 65535.
+
+@item low
+Set lower limit for changing source pixel. Default is 65535. Allowed range is from 0 to 65535.
+This option controls maximum possible value that will decrease source pixel value.
+
+@item high
+Set high limit for changing source pixel. Default is 65535. Allowed range is from 0 to 65535.
+This option controls maximum possible value that will increase source pixel value.
+
+@item planes
+Set which planes to filter. Default is all. Allowed range is from 0 to 15.
+@end table
+
@section ass
Same as the @ref{subtitles} filter, except that it doesn't require libavcodec
threshold B is designed to react on continuous changes in the input signal.
@item s
-Set number of frames filter will use for averaging. Default is 33. Must be odd
+Set number of frames filter will use for averaging. Default is 9. Must be odd
number in range [5, 129].
@item p
@section convolution
-Apply convolution 3x3, 5x5 or 7x7 filter.
+Apply convolution of 3x3, 5x5, 7x7 or horizontal/vertical up to 49 elements.
The filter accepts the following options:
@item 2m
@item 3m
Set matrix for each plane.
-Matrix is sequence of 9, 25 or 49 signed integers.
+Matrix is sequence of 9, 25 or 49 signed integers in @var{square} mode,
+and from 1 to 49 odd number of signed integers in @var{row} mode.
@item 0rdiv
@item 1rdiv
@item 2rdiv
@item 3rdiv
Set multiplier for calculated value for each plane.
+If unset or 0, it will be sum of all matrix elements.
@item 0bias
@item 1bias
@item 3bias
Set bias for each plane. This value is added to the result of the multiplication.
Useful for making the overall image brighter or darker. Default is 0.0.
+
+@item 0mode
+@item 1mode
+@item 2mode
+@item 3mode
+Set matrix mode for each plane. Can be @var{square}, @var{row} or @var{column}.
+Default is @var{square}.
@end table
@subsection Examples
The default is disabled.
@end table
+@section deblock
+
+Remove blocking artifacts from input video.
+
+The filter accepts the following options:
+
+@table @option
+@item filter
+Set filter type, can be @var{weak} or @var{strong}. Default is @var{strong}.
+This controls what kind of deblocking is applied.
+
+@item block
+Set size of block, allowed range is from 4 to 512. Default is @var{8}.
+
+@item alpha
+@item beta
+@item gamma
+@item delta
+Set blocking detection thresholds. Allowed range is 0 to 1.
+Defaults are: @var{0.098} for @var{alpha} and @var{0.05} for the rest.
+Using higher threshold gives more deblocking strength.
+Setting @var{alpha} controls threshold detection at exact edge of block.
+Remaining options controls threshold detection near the edge. Each one for
+below/above or left/right. Setting any of those to @var{0} disables
+deblocking.
+
+@item planes
+Set planes to filter. Default is to filter all available planes.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Deblock using weak filter and block size of 4 pixels.
+@example
+deblock=filter=weak:block=4
+@end example
+
+@item
+Deblock using strong filter, block size of 4 pixels and custom thresholds for
+deblocking more edges.
+@example
+deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05
+@end example
+
+@item
+Similar as above, but filter only first plane.
+@example
+deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=1
+@end example
+
+@item
+Similar as above, but filter only second and third plane.
+@example
+deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=6
+@end example
+@end itemize
+
@anchor{decimate}
@section decimate
The second argument is an offset added to the timestamp.
+If the format is set to @code{hms}, a third argument @code{24HH} may be
+supplied to present the hour part of the formatted timestamp in 24h format
+(00-23).
+
If the format is set to @code{localtime} or @code{gmtime},
a third argument may be supplied: a strftime() format string.
By default, @var{YYYY-MM-DD HH:MM:SS} format will be used.
@item colormix
Mix the colors to create a paint/cartoon effect.
-@end table
+@item canny
+Apply Canny edge detector on all selected planes.
+@end table
Default value is @var{wires}.
+
+@item planes
+Select planes for filtering. By default all available planes are filtered.
@end table
@subsection Examples
@end itemize
+@section fftdnoiz
+Denoise frames using 3D FFT (frequency domain filtering).
+
+The filter accepts the following options:
+
+@table @option
+@item sigma
+Set the noise sigma constant. This sets denoising strength.
+Default value is 1. Allowed range is from 0 to 30.
+Using very high sigma with low overlap may give blocking artifacts.
+
+@item amount
+Set amount of denoising. By default all detected noise is reduced.
+Default value is 1. Allowed range is from 0 to 1.
+
+@item block
+Set size of block, Default is 4, can be 3, 4, 5 or 6.
+Actual size of block in pixels is 2 to power of @var{block}, so by default
+block size in pixels is 2^4 which is 16.
+
+@item overlap
+Set block overlap. Default is 0.5. Allowed range is from 0.2 to 0.8.
+
+@item prev
+Set number of previous frames to use for denoising. By default is set to 0.
+
+@item next
+Set number of next frames to to use for denoising. By default is set to 0.
+
+@item planes
+Set planes which will be filtered, by default are all available filtered
+except alpha.
+@end table
+
@section field
Extract a single field from an interlaced image using stride
@item cx
Relative x-coordinate of the focal point of the image, and thereby the center of the
distortion. This value has a range [0,1] and is expressed as fractions of the image
-width.
+width. Default is 0.5.
@item cy
Relative y-coordinate of the focal point of the image, and thereby the center of the
distortion. This value has a range [0,1] and is expressed as fractions of the image
-height.
+height. Default is 0.5.
@item k1
-Coefficient of the quadratic correction term. 0.5 means no correction.
+Coefficient of the quadratic correction term. This value has a range [-1,1]. 0 means
+no correction. Default is 0.
@item k2
-Coefficient of the double quadratic correction term. 0.5 means no correction.
+Coefficient of the double quadratic correction term. This value has a range [-1,1].
+0 means no correction. Default is 0.
@end table
The formula that generates the correction is:
@item weights
Specify weight of each input video stream as sequence.
-Each weight is separated by space.
+Each weight is separated by space. If number of weights
+is smaller than number of @var{frames} last specified
+weight will be used for all remaining unset weights.
+
+@item scale
+Specify scale, if it is set it will be multiplied with sum
+of each weight multiplied with pixel values to give final destination
+pixel value. By default @var{scale} is auto scaled to sum of weights.
@item duration
Specify how end of stream is determined.
@section ocr
Optical Character Recognition
-This filter uses Tesseract for optical character recognition.
+This filter uses Tesseract for optical character recognition. To enable
+compilation of this filter, you need to configure FFmpeg with
+@code{--enable-libtesseract}.
It accepts the following options:
subtitles=video.mkv:si=1
@end example
-To make the subtitles stream from @file{sub.srt} appear in transparent green
+To make the subtitles stream from @file{sub.srt} appear in 80% transparent blue
@code{DejaVu Serif}, use:
@example
-subtitles=sub.srt:force_style='FontName=DejaVu Serif,PrimaryColour=&HAA00FF00'
+subtitles=sub.srt:force_style='FontName=DejaVu Serif,PrimaryColour=&HCCFF0000'
@end example
@section super2xsai
@end table
+@section tmix
+
+Mix successive video frames.
+
+A description of the accepted options follows.
+
+@table @option
+@item frames
+The number of successive frames to mix. If unspecified, it defaults to 3.
+
+@item weights
+Specify weight of each input video frame.
+Each weight is separated by space. If number of weights is smaller than
+number of @var{frames} last specified weight will be used for all remaining
+unset weights.
+
+@item scale
+Specify scale, if it is set it will be multiplied with sum
+of each weight multiplied with pixel values to give final destination
+pixel value. By default @var{scale} is auto scaled to sum of weights.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Average 7 successive frames:
+@example
+tmix=frames=7:weights="1 1 1 1 1 1 1"
+@end example
+
+@item
+Apply simple temporal convolution:
+@example
+tmix=frames=3:weights="-1 3 -1"
+@end example
+
+@item
+Similar as above but only showing temporal differences:
+@example
+tmix=frames=3:weights="-1 2 -1":scale=1
+@end example
+@end itemize
+
@section tonemap
Tone map colors from different dynamic ranges.
ffmpeg -i in.avi -vf "vflip" out.avi
@end example
+@section vfrdet
+
+Detect variable frame rate video.
+
+This filter tries to detect if the input is variable or constant frame rate.
+
+At end it will output number of frames detected as having variable delta pts,
+and ones with constant delta pts.
+If there was frames with variable delta, than it will also show min and max delta
+encountered.
+
@anchor{vignette}
@section vignette
@anchor{zscale}
@section zscale
Scale (resize) the input video, using the z.lib library:
-https://github.com/sekrit-twc/zimg.
+@url{https://github.com/sekrit-twc/zimg}. To enable compilation of this
+filter, you need to configure FFmpeg with @code{--enable-libzimg}.
The zscale filter forces the output display aspect ratio to be the same
as the input, by changing the output sample aspect ratio.
@anchor{color}
@anchor{haldclutsrc}
@anchor{nullsrc}
+@anchor{pal75bars}
+@anchor{pal100bars}
@anchor{rgbtestsrc}
@anchor{smptebars}
@anchor{smptehdbars}
@anchor{testsrc}
@anchor{testsrc2}
@anchor{yuvtestsrc}
-@section allrgb, allyuv, color, haldclutsrc, nullsrc, rgbtestsrc, smptebars, smptehdbars, testsrc, testsrc2, yuvtestsrc
+@section allrgb, allyuv, color, haldclutsrc, nullsrc, pal75bars, pal100bars, rgbtestsrc, smptebars, smptehdbars, testsrc, testsrc2, yuvtestsrc
The @code{allrgb} source returns frames of size 4096x4096 of all rgb colors.
mainly useful to be employed in analysis / debugging tools, or as the
source for filters which ignore the input data.
+The @code{pal75bars} source generates a color bars pattern, based on
+EBU PAL recommendations with 75% color levels.
+
+The @code{pal100bars} source generates a color bars pattern, based on
+EBU PAL recommendations with 100% color levels.
+
The @code{rgbtestsrc} source generates an RGB test pattern useful for
detecting RGB vs BGR issues. You should see a red, green and blue
stripe from top to bottom.
@item m
Set metering mode, can be peak: @code{p} or rms: @code{r},
default is @code{p}.
+
+@item ds
+Set display scale, can be linear: @code{lin} or log: @code{log},
+default is @code{lin}.
+
+@item dm
+In second.
+If set to > 0., display a line for the max level
+in the previous seconds.
+default is disabled: @code{0.}
+
+@item dmc
+The color of the max line. Use when @code{dm} option is set to > 0.
+default is: @code{orange}
@end table
@section showwaves
projects / ffmpeg / blobdiff