@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@end itemize
+@section axcorrelate
+Calculate normalized cross-correlation between two input audio streams.
+
+Resulted samples are always between -1 and 1 inclusive.
+If result is 1 it means two input samples are highly correlated in that selected segment.
+Result 0 means they are not correlated at all.
+If result is -1 it means two input samples are out of phase, which means they cancel each
+other.
+
+The filter accepts the following options:
+
+@table @option
+@item size
+Set size of segment over which cross-correlation is calculated.
+Default is 256. Allowed range is from 2 to 131072.
+
+@item algo
+Set algorithm for cross-correlation. Can be @code{slow} or @code{fast}.
+Default is @code{slow}. Fast algorithm assumes mean values over any given segment
+are always zero and thus need much less calculations to make.
+This is generally not true, but is valid for typical audio streams.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Calculate correlation between channels in stereo audio stream:
+@example
+ffmpeg -i stereo.wav -af channelsplit,axcorrelate=size=1024:algo=fast correlation.wav
+@end example
+@end itemize
+
@section bandpass
Apply a two-pole Butterworth band-pass filter with central
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@item mix, m
How much to use filtered signal in output. Default is 1.
Range is between 0 and 1.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@section bs2b
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Examples
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Examples
or equal to a noise tolerance value for a duration greater or equal to the
minimum detected noise duration.
-The printed times and duration are expressed in seconds.
+The printed times and duration are expressed in seconds. The
+@code{lavfi.silence_start} or @code{lavfi.silence_start.X} metadata key
+is set on the first frame whose timestamp equals or exceeds the detection
+duration and it contains the timestamp of the first frame of the silence.
+
+The @code{lavfi.silence_duration} or @code{lavfi.silence_duration.X}
+and @code{lavfi.silence_end} or @code{lavfi.silence_end.X} metadata
+keys are set on the first frame after the silence. If @option{mono} is
+enabled, and each channel is evaluated separately, the @code{.X}
+suffixed keys are used, and @code{X} corresponds to the channel number.
The filter accepts the following options:
specified value) or amplitude ratio. Default is -60dB, or 0.001.
@item duration, d
-Set silence duration until notification (default is 2 seconds).
+Set silence duration until notification (default is 2 seconds). See
+@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}
+for the accepted syntax.
@item mono, m
Process each channel separately, instead of combined. By default is disabled.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+@item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
Set the minimal luminance value. Default is @code{16}.
@end table
+@section bilateral
+Apply bilateral filter, spatial smoothing while preserving edges.
+
+The filter accepts the following options:
+@table @option
+@item sigmaS
+Set sigma of gaussian function to calculate spatial weight.
+Allowed range is 0 to 10. Default is 0.1.
+
+@item sigmaR
+Set sigma of gaussian function to calculate range weight.
+Allowed range is 0 to 1. Default is 0.1.
+
+@item planes
+Set planes to filter. Default is first only.
+@end table
+
@section bitplanenoise
Show and measure bit plane noise.
This can be used to pass exact YUV values as hexadecimal numbers.
@end table
+@subsection Commands
+This filter supports same @ref{commands} as options.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
@section chromakey
YUV colorspace color/chroma keying.
This can be used to pass exact YUV values as hexadecimal numbers.
@end table
+@subsection Commands
+This filter supports same @ref{commands} as options.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
@subsection Examples
@itemize
Set edge mode, can be @var{smear}, default, or @var{warp}.
@end table
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
@section ciescope
Display CIE color diagram with pixels overlaid onto it.
Adjust red, green and blue highlights (brightest pixels).
Allowed ranges for options are @code{[-1.0, 1.0]}. Defaults are @code{0}.
+
+@item pl
+Preserve lightness when changing color balance. Default is disabled.
@end table
@subsection Examples
@end example
@end itemize
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
@section colorchannelmixer
Adjust video input frames by re-mixing color channels.
@end example
@end itemize
+@section dnn_processing
+
+Do image processing with deep neural networks. Currently only AVFrame with RGB24
+and BGR24 are supported, more formats will be added later.
+
+The filter accepts the following options:
+
+@table @option
+@item dnn_backend
+Specify which DNN backend to use for model loading and execution. This option accepts
+the following values:
+
+@table @samp
+@item native
+Native implementation of DNN loading and execution.
+
+@item tensorflow
+TensorFlow backend. To enable this backend you
+need to install the TensorFlow for C library (see
+@url{https://www.tensorflow.org/install/install_c}) and configure FFmpeg with
+@code{--enable-libtensorflow}
+@end table
+
+Default value is @samp{native}.
+
+@item model
+Set path to model file specifying network architecture and its parameters.
+Note that different backends use different file formats. TensorFlow and native
+backend can load files for only its format.
+
+Native model file (.model) can be generated from TensorFlow model file (.pb) by using tools/python/convert.py
+
+@item input
+Set the input name of the dnn network.
+
+@item output
+Set the output name of the dnn network.
+
+@item fmt
+Set the pixel format for the Frame. Allowed values are @code{AV_PIX_FMT_RGB24}, and @code{AV_PIX_FMT_BGR24}.
+Default value is @code{AV_PIX_FMT_RGB24}.
+
+@end table
+
@section drawbox
Draw a colored box on the input image.
If the specified expression is not valid, it is kept at its current
value.
+@anchor{drawgraph}
+@section drawgraph
+Draw a graph using input video metadata.
+
+It accepts the following parameters:
+
+@table @option
+@item m1
+Set 1st frame metadata key from which metadata values will be used to draw a graph.
+
+@item fg1
+Set 1st foreground color expression.
+
+@item m2
+Set 2nd frame metadata key from which metadata values will be used to draw a graph.
+
+@item fg2
+Set 2nd foreground color expression.
+
+@item m3
+Set 3rd frame metadata key from which metadata values will be used to draw a graph.
+
+@item fg3
+Set 3rd foreground color expression.
+
+@item m4
+Set 4th frame metadata key from which metadata values will be used to draw a graph.
+
+@item fg4
+Set 4th foreground color expression.
+
+@item min
+Set minimal value of metadata value.
+
+@item max
+Set maximal value of metadata value.
+
+@item bg
+Set graph background color. Default is white.
+
+@item mode
+Set graph mode.
+
+Available values for mode is:
+@table @samp
+@item bar
+@item dot
+@item line
+@end table
+
+Default is @code{line}.
+
+@item slide
+Set slide mode.
+
+Available values for slide is:
+@table @samp
+@item frame
+Draw new frame when right border is reached.
+
+@item replace
+Replace old columns with new ones.
+
+@item scroll
+Scroll from right to left.
+
+@item rscroll
+Scroll from left to right.
+
+@item picture
+Draw single picture.
+@end table
+
+Default is @code{frame}.
+
+@item size
+Set size of graph video. For the syntax of this option, check the
+@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
+The default value is @code{900x256}.
+
+The foreground color expressions can use the following variables:
+@table @option
+@item MIN
+Minimal value of metadata value.
+
+@item MAX
+Maximal value of metadata value.
+
+@item VAL
+Current metadata key value.
+@end table
+
+The color is defined as 0xAABBGGRR.
+@end table
+
+Example using metadata from @ref{signalstats} filter:
+@example
+signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255
+@end example
+
+Example using metadata from @ref{ebur128} filter:
+@example
+ebur128=metadata=1,adrawgraph=lavfi.r128.M:min=-120:max=5
+@end example
+
@section drawgrid
Draw a grid on the input image.
Set color for pixels in fixed mode. Default is @var{black}.
@end table
+@subsection Commands
+This filter supports same @ref{commands} as options.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
@section find_rect
Find a rectangular object
@end itemize
-@section graphmonitor, agraphmonitor
+@anchor{graphmonitor}
+@section graphmonitor
Show various filtergraph stats.
With this filter one can debug complete filtergraph.
@table @option
@item model_path
Set the model path which is to be used for SVM.
-Default value: @code{"vmaf_v0.6.1.pkl"}
+Default value: @code{"/usr/local/share/model/vmaf_v0.6.1.pkl"}
@item log_path
Set the file path to be used to store logs.
@item phone_model
Invokes the phone model which will generate VMAF scores higher than in the
regular model, which is more suitable for laptop, TV, etc. viewing conditions.
+Default value: @code{false}
@item psnr
Enables computing psnr along with vmaf.
+Default value: @code{false}
@item ssim
Enables computing ssim along with vmaf.
+Default value: @code{false}
@item ms_ssim
Enables computing ms_ssim along with vmaf.
+Default value: @code{false}
@item pool
-Set the pool method (mean, min or harmonic mean) to be used for computing vmaf.
+Set the pool method to be used for computing vmaf.
+Options are @code{min}, @code{harmonic_mean} or @code{mean} (default).
@item n_threads
Set number of threads to be used when computing vmaf.
+Default value: @code{0}, which makes use of all available logical processors.
@item n_subsample
Set interval for frame subsampling used when computing vmaf.
+Default value: @code{1}
@item enable_conf_interval
Enables confidence interval.
+Default value: @code{false}
@end table
This filter also supports the @ref{framesync} options.
+@subsection Examples
+@itemize
+@item
On the below examples the input file @file{main.mpg} being processed is
compared with the reference file @file{ref.mpg}.
ffmpeg -i main.mpg -i ref.mpg -lavfi libvmaf -f null -
@end example
+@item
Example with options:
@example
ffmpeg -i main.mpg -i ref.mpg -lavfi libvmaf="psnr=1:log_fmt=json" -f null -
@end example
+@item
+Example with options and different containers:
+@example
+ffmpeg -i main.mpg -i ref.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]libvmaf=psnr=1:log_fmt=json" -f null -
+@end example
+@end itemize
+
@section limiter
Limits the pixel components values to the specified range [min, max].
@item tolerance
Set the range of luma values to be keyed out.
-Default value is @code{0}.
+Default value is @code{0.01}.
@item softness
Set the range of softness. Default value is @code{0}.
Use this to control gradual transition from zero to full transparency.
@end table
+@subsection Commands
+This filter supports same @ref{commands} as options.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
@section lut, lutrgb, lutyuv
Compute a look-up table for binding each pixel component input value
By default value 0xf, all planes will be processed.
@end table
+@section maskedmax
+
+Merge the second and third input stream into output stream using absolute differences
+between second input stream and first input stream and absolute difference between
+third input stream and first input stream. The picked value will be from second input
+stream if second absolute difference is greater than first one or from third input stream
+otherwise.
+
+This filter accepts the following options:
+@table @option
+@item planes
+Set which planes will be processed as bitmap, unprocessed planes will be
+copied from first stream.
+By default value 0xf, all planes will be processed.
+@end table
+
@section maskedmerge
Merge the first input stream with the second input stream using per pixel
By default value 0xf, all planes will be processed.
@end table
+@section maskedmin
+
+Merge the second and third input stream into output stream using absolute differences
+between second input stream and first input stream and absolute difference between
+third input stream and first input stream. The picked value will be from second input
+stream if second absolute difference is less than first one or from third input stream
+otherwise.
+
+This filter accepts the following options:
+@table @option
+@item planes
+Set which planes will be processed as bitmap, unprocessed planes will be
+copied from first stream.
+By default value 0xf, all planes will be processed.
+@end table
+
@section maskfun
Create mask from input video.
optimal individual vectors. Default value is 1.
@end table
+@section median
+
+Pick median pixel from certain rectangle defined by radius.
+
+This filter accepts the following options:
+
+@table @option
+@item radius
+Set horizontal radius size. Default value is @code{1}.
+Allowed range is integer from 1 to 127.
+
+@item planes
+Set which planes to process. Default is @code{15}, which is all available planes.
+
+@item radiusV
+Set vertical radius size. Default value is @code{0}.
+Allowed range is integer from 0 to 127.
+If it is 0, value will be picked from horizontal @code{radius} option.
+@end table
+
+@subsection Commands
+This filter supports same @ref{commands} as options.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
@section mergeplanes
Merge color channel components from several video streams.
@end table
+@subsection Commands
+This filter supports same @ref{commands} as options, excluding @var{smoothing} option.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
@subsection Examples
Stretch video contrast to use the full dynamic range, with no temporal
Draw scope. By default is enabled.
@end table
+@subsection Commands
+This filter supports same @ref{commands} as options.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
@subsection Examples
@itemize
Lower is stricter.
@item skip
-Set how many pixels to skip when sampling frames. Defalt is 1.
+Set how many pixels to skip when sampling frames. Default is 1.
Allowed range is from 1 to 1024.
@item bypass
channels.
@end table
+@subsection Examples
+@itemize
+@item
For example:
@example
movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
reference file @file{ref_movie.mpg}. The PSNR of each individual frame
is stored in @file{stats.log}.
+@item
+Another example with different containers:
+@example
+ffmpeg -i main.mpg -i ref.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]psnr" -f null -
+@end example
+@end itemize
+
@anchor{pullup}
@section pullup
Set edge mode, can be @var{smear}, default, or @var{warp}.
@end table
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
@section roberts
Apply roberts cross operator to input video stream.
This filter also supports the @ref{framesync} options.
+@subsection Examples
+@itemize
+@item
For example:
@example
movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
reference file @file{ref_movie.mpg}. The SSIM of each individual frame
is stored in @file{stats.log}.
+@item
Another example with both psnr and ssim at same time:
@example
ffmpeg -i main.mpg -i ref.mpg -lavfi "ssim;[0:v][1:v]psnr" -f null -
@end example
+@item
+Another example with different containers:
+@example
+ffmpeg -i main.mpg -i ref.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]ssim" -f null -
+@end example
+@end itemize
+
@section stereo3d
Convert between different stereoscopic image formats.
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.
+If there was frames with variable delta, than it will also show min, max and
+average delta encountered.
@section vibrance
@section vmafmotion
-Obtain the average vmaf motion score of a video.
-It is one of the component filters of VMAF.
+Obtain the average VMAF motion score of a video.
+It is one of the component metrics of VMAF.
The obtained average motion score is printed through the logging system.
-In the below example the input file @file{ref.mpg} is being processed and score
-is computed.
+The filter accepts the following options:
+
+@table @option
+@item stats_file
+If specified, the filter will use the named file to save the motion score of
+each frame with respect to the previous frame.
+When filename equals "-" the data is sent to standard output.
+@end table
+Example:
@example
-ffmpeg -i ref.mpg -lavfi vmafmotion -f null -
+ffmpeg -i ref.mpg -vf vmafmotion -f null -
@end example
@section vstack
Default value is @code{0}.
@item y
-Set the x coordinate of the overlaid video on the main video.
+Set the y coordinate of the overlaid video on the main video.
Default value is @code{0}.
@end table
@item ring2
@item all
+@item max_frames, m
+Set the maximum number of frames generated for each test, default value is 30.
+
@end table
Default value is "all", which will cycle through the list of all tests.
by white color.
@end table
+@section adrawgraph
+Draw a graph using input audio metadata.
+
+See @ref{drawgraph}
+
+@section agraphmonitor
+
+See @ref{graphmonitor}.
+
@section ahistogram
Convert input audio to a video output, displaying the volume histogram.
Close the current segment and step to the next one
@end table
-@section drawgraph, adrawgraph
-
-Draw a graph using input video or audio metadata.
-
-It accepts the following parameters:
-
-@table @option
-@item m1
-Set 1st frame metadata key from which metadata values will be used to draw a graph.
-
-@item fg1
-Set 1st foreground color expression.
-
-@item m2
-Set 2nd frame metadata key from which metadata values will be used to draw a graph.
-
-@item fg2
-Set 2nd foreground color expression.
-
-@item m3
-Set 3rd frame metadata key from which metadata values will be used to draw a graph.
-
-@item fg3
-Set 3rd foreground color expression.
-
-@item m4
-Set 4th frame metadata key from which metadata values will be used to draw a graph.
-
-@item fg4
-Set 4th foreground color expression.
-
-@item min
-Set minimal value of metadata value.
-
-@item max
-Set maximal value of metadata value.
-
-@item bg
-Set graph background color. Default is white.
-
-@item mode
-Set graph mode.
-
-Available values for mode is:
-@table @samp
-@item bar
-@item dot
-@item line
-@end table
-
-Default is @code{line}.
-
-@item slide
-Set slide mode.
-
-Available values for slide is:
-@table @samp
-@item frame
-Draw new frame when right border is reached.
-
-@item replace
-Replace old columns with new ones.
-
-@item scroll
-Scroll from right to left.
-
-@item rscroll
-Scroll from left to right.
-
-@item picture
-Draw single picture.
-@end table
-
-Default is @code{frame}.
-
-@item size
-Set size of graph video. For the syntax of this option, check the
-@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
-The default value is @code{900x256}.
-
-The foreground color expressions can use the following variables:
-@table @option
-@item MIN
-Minimal value of metadata value.
-
-@item MAX
-Maximal value of metadata value.
-
-@item VAL
-Current metadata key value.
-@end table
-
-The color is defined as 0xAABBGGRR.
-@end table
-
-Example using metadata from @ref{signalstats} filter:
-@example
-signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255
-@end example
-
-Example using metadata from @ref{ebur128} filter:
-@example
-ebur128=metadata=1,adrawgraph=lavfi.r128.M:min=-120:max=5
-@end example
-
@anchor{ebur128}
@section ebur128
projects / ffmpeg / blobdiff