Range is between 0 and 1.
@end table
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
@section acontrast
Simple audio dynamic range compression/expansion filter.
@anchor{afir}
@section afir
-Apply an arbitrary Frequency Impulse Response filter.
+Apply an arbitrary Finite Impulse Response filter.
This filter is designed for applying long FIR filters,
up to 60 seconds long.
room equalization, cross talk cancellation, wavefield synthesis,
auralization, ambiophonics, ambisonics and spatialization.
-This filter uses the second stream as FIR coefficients.
-If the second stream holds a single channel, it will be used
+This filter uses the streams higher than first one as FIR coefficients.
+If the non-first stream holds a single channel, it will be used
for all input channels in the first stream, otherwise
-the number of channels in the second stream must be same as
+the number of channels in the non-first stream must be same as
the number of channels in the first stream.
It accepts the following parameters:
@item minp
Set minimal partition size used for convolution. Default is @var{8192}.
-Allowed range is from @var{8} to @var{32768}.
+Allowed range is from @var{1} to @var{32768}.
Lower values decreases latency at cost of higher CPU usage.
@item maxp
Set maximal partition size used for convolution. Default is @var{8192}.
Allowed range is from @var{8} to @var{32768}.
Lower values may increase CPU usage.
+
+@item nbirs
+Set number of input impulse responses streams which will be switchable at runtime.
+Allowed range is from @var{1} to @var{32}. Default is @var{1}.
+
+@item ir
+Set IR stream which will be used for convolution, starting from @var{0}, should always be
+lower than supplied value by @code{nbirs} option. Default is @var{0}.
+This option can be changed at runtime via @ref{commands}.
@end table
@subsection Examples
It accepts the following parameters:
@table @option
-@item sample_fmts
+@item sample_fmts, f
A '|'-separated list of requested sample formats.
-@item sample_rates
+@item sample_rates, r
A '|'-separated list of requested sample rates.
-@item channel_layouts
+@item channel_layouts, cl
A '|'-separated list of requested channel layouts.
See @ref{channel layout syntax,,the Channel Layout section in the ffmpeg-utils(1) manual,ffmpeg-utils}
Enable clipping. By default is enabled.
@end table
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
@section dcshift
Apply a DC shift to the audio.
frame.
In general, smaller parameters result in stronger compression, and vice versa.
Values below 3.0 are not recommended, because audible distortion may appear.
+
+@item threshold, t
+Set the target threshold value. This specifies the lowest permissible
+magnitude level for the audio input which will be normalized.
+If input frame volume is above this value frame will be normalized.
+Otherwise frame may not be normalized at all. The default value is set
+to 0, which means all input frames will be normalized.
+This option is mostly useful if digital noise is not wanted to be amplified.
@end table
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
@section earwax
Make audio easier to listen to on headphones.
Range is between 0 and 1.
@end table
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
@subsection Examples
@itemize
Default value for @var{replaygain_preamp} is 0.0.
+@item replaygain_noclip
+Prevent clipping by limiting the gain applied.
+
+Default value for @var{replaygain_noclip} is 1.
+
@item eval
Set when the volume expression is evaluated.
If the specified expression is not valid, it is kept at its current
value.
-@item replaygain_noclip
-Prevent clipping by limiting the gain applied.
-
-Default value for @var{replaygain_noclip} is 1.
-
@end table
@subsection Examples
@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.
+Do image processing with deep neural networks. It works together with another filter
+which converts the pixel format of the Frame to what the dnn network requires.
The filter accepts the following options:
@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
+@itemize
+@item
+Halve the red channle of the frame with format rgb24:
+@example
+ffmpeg -i input.jpg -vf format=rgb24,dnn_processing=model=halve_first_channel.model:input=dnn_in:output=dnn_out:dnn_backend=native out.native.png
+@end example
+
+@item
+Halve the pixel value of the frame with format gray32f:
+@example
+ffmpeg -i input.jpg -vf format=grayf32,dnn_processing=model=halve_gray_float.model:input=dnn_in:output=dnn_out:dnn_backend=native -y out.native.png
+@end example
+
+@end itemize
+
@section drawbox
Draw a colored box on the input image.
@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
The default value is @code{900x256}.
+@item rate, r
+Set the output frame rate. Default value is @code{25}.
+
The foreground color expressions can use the following variables:
@table @option
@item MIN
drawtext=fontfile=FreeSans.ttf:text=cow:fontsize=24:x=80:y=20+24-max_glyph_a
@end example
+@item
+Plot special @var{lavf.image2dec.source_basename} metadata onto each frame if
+such metadata exists. Otherwise, plot the string "NA". Note that image2 demuxer
+must have option @option{-export_path_metadata 1} for the special metadata fields
+to be available for filters.
+@example
+drawtext="fontsize=20:fontcolor=white:fontfile=FreeSans.ttf:text='%@{metadata\:lavf.image2dec.source_basename\:NA@}':x=10:y=10"
+@end example
+
@end itemize
For more information about libfreetype, check:
Set freeze duration until notification (default is 2 seconds).
@end table
+@section freezeframes
+
+Freeze video frames.
+
+This filter freezes video frames using frame from 2nd input.
+
+The filter accepts the following options:
+
+@table @option
+@item first
+Set number of first frame from which to start freeze.
+
+@item last
+Set number of last frame from which to end freeze.
+
+@item replace
+Set number of frame from 2nd input which will be used instead of replaced frames.
+@end table
+
@anchor{frei0r}
@section frei0r
@item ovsub
horizontal and vertical output chroma subsample values. For example for the
pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
+
+@item n
+The (sequential) number of the input frame, starting from 0.
+Only available with @code{eval=frame}.
+
+@item t
+The presentation timestamp of the input frame, expressed as a number of
+seconds. Only available with @code{eval=frame}.
+
+@item pos
+The position (byte offset) of the frame in the input stream, or NaN if
+this information is unavailable and/or meaningless (for example in case of synthetic video).
+Only available with @code{eval=frame}.
@end table
@subsection Examples
The main input video's horizontal and vertical chroma subsample values.
For example for the pixel format "yuv422p" @var{hsub} is 2 and @var{vsub}
is 1.
+
+@item main_n
+The (sequential) number of the main input frame, starting from 0.
+Only available with @code{eval=frame}.
+
+@item main_t
+The presentation timestamp of the main input frame, expressed as a number of
+seconds. Only available with @code{eval=frame}.
+
+@item main_pos
+The position (byte offset) of the frame in the main input stream, or NaN if
+this information is unavailable and/or meaningless (for example in case of synthetic video).
+Only available with @code{eval=frame}.
@end table
@subsection Examples
@end example
@end itemize
+@subsection Commands
+
+This filter supports the following commands:
+@table @option
+@item width, w
+@item height, h
+Set the output video dimension expression.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+@end table
+
@section scroll
Scroll input video horizontally and/or vertically by constant speed.
@item plane_checksum
The Adler-32 checksum (printed in hexadecimal) of each plane of the input frame,
expressed in the form "[@var{c0} @var{c1} @var{c2} @var{c3}]".
+
+@item mean
+The mean value of pixels in each plane of the input frame, expressed in the form
+"[@var{mean0} @var{mean1} @var{mean2} @var{mean3}]".
+
+@item stdev
+The standard deviation of pixel values in each plane of the input frame, expressed
+in the form "[@var{stdev0} @var{stdev1} @var{stdev2} @var{stdev3}]".
+
@end table
@section showpalette
@code{0} (not enabled).
@end table
+@subsection Commands
+
+This filter supports the following commands:
+@table @option
+@item level
+@item quality
+Same as quality option. And the command accepts the @code{max} same as the @code{6}.
+@end table
+
@section sr
Scale the input by applying one of the super-resolution methods based on
Default is @code{7}.
@item bgopacity, b
-Set background opacity. Default is @code{0.5}.
+Set background opacity. Default is @code{0.9}.
+
+@item envelope, e
+Show envelope. Default is disabled.
+
+@item ecolor, ec
+Set envelope color. Default is @code{gold}.
@end table
@section threshold
pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
@end table
+@subsection Commands
+
+This filter supports the following commands:
@table @option
+@item width, w
+@item height, h
+Set the output video dimension expression.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
@end table
@c man end VIDEO FILTERS
for standard output. If @code{file} option is not set, output is written to the log
with AV_LOG_INFO loglevel.
+@item direct
+Reduces buffering in print mode when output is written to a URL set using @var{file}.
+
@end table
@subsection Examples
projects / ffmpeg / blobdiff