smaller than number of channels all remaining channels will not be delayed.
If you want to delay exact number of samples, append 'S' to number.
If you want instead to delay in seconds, append 's' to number.
+
+@item all
+Use last set delay for all remaining channels. By default is disabled.
+This option if enabled changes how option @code{delays} is interpreted.
@end table
@subsection Examples
@example
adelay=0|500S|700S
@end example
+
+@item
+Delay all channels by same number of samples:
+@example
+adelay=delays=64S:all=1
+@end example
@end itemize
@section aderivative, aintegral
@end example
@item
-If delay is very short, then it sound like a (metallic) robot playing music:
+If delay is very short, then it sounds like a (metallic) robot playing music:
@example
aecho=0.8:0.88:6:0.4
@end example
@example
afftfilt="'real=re * (1-clip((b/nb)*b,0,1))':imag='im * (1-clip((b/nb)*b,0,1))'"
@end example
+
+@item
+Apply robotize effect:
+@example
+afftfilt="real='hypot(re,im)*sin(0)':imag='hypot(re,im)*cos(0)':win_size=512:overlap=0.75"
+@end example
+
+@item
+Apply whisper effect:
+@example
+afftfilt="real='hypot(re,im)*cos((random(0)*2-1)*2*3.14)':imag='hypot(re,im)*sin((random(1)*2-1)*2*3.14)':win_size=128:overlap=0.8"
+@end example
@end itemize
@anchor{afir}
room equalization, cross talk cancellation, wavefield synthesis,
auralization, ambiophonics, ambisonics and spatialization.
-This filter uses second stream as FIR coefficients.
-If second stream holds single channel, it will be used
-for all input channels in first stream, otherwise
-number of channels in second stream must be same as
-number of channels in first stream.
+This filter uses the second stream as FIR coefficients.
+If the second 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 first stream.
It accepts the following parameters:
context similarity is defined by comparing their surrounding patches of size
@option{p}. Patches are searched in an area of @option{r} around the sample.
-The filter accepts the following options.
+The filter accepts the following options:
@table @option
@item s
Syntax for the command is : "i", "o" or "n" string.
@end table
+@section anlms
+Apply Normalized Least-Mean-Squares algorithm to the first audio stream using the second audio stream.
+
+This adaptive filter is used to mimic a desired filter by finding the filter coefficients that
+relate to producing the least mean square of the error signal (difference between the desired,
+2nd input audio stream and the actual signal, the 1st input audio stream).
+
+A description of the accepted options follows.
+
+@table @option
+@item order
+Set filter order.
+
+@item mu
+Set filter mu.
+
+@item eps
+Set the filter eps.
+
+@item leakage
+Set the filter leakage.
+
+@item out_mode
+It accepts the following values:
+@table @option
+@item i
+Pass the 1st input.
+
+@item d
+Pass the 2nd input.
+
+@item o
+Pass filtered samples.
+
+@item n
+Pass difference between desired and filtered samples.
+
+Default value is @var{o}.
+@end table
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+One of many usages of this filter is noise reduction, input audio is filtered
+with same samples that are delayed by fixed amount, one such example for stereo audio is:
+@example
+asplit[a][b],[a]adelay=32S|32S[a],[b][a]anlms=order=128:leakage=0.0005:mu=.5:out_mode=o
+@end example
+@end itemize
+
+@subsection Commands
+
+This filter supports the same commands as options, excluding option @code{order}.
+
@section anull
Pass the audio source unchanged to the output.
@end example
@end itemize
+@subsection Commands
+
+This filter supports the following commands:
+@table @option
+@item tempo
+Change filter tempo scale factor.
+Syntax for the command is : "@var{tempo}"
+@end table
+
@section atrim
Trim the input so that the output contains one continuous subpart of the input.
positions of microphones or speakers.
For example, you have recorded guitar with two microphones placed in
-different location. Because the front of sound wave has fixed speed in
+different locations. Because the front of sound wave has fixed speed in
normal conditions, the phasing of microphones can vary and depends on
their location and interposition. The best sound mix can be achieved when
-these microphones are in phase (synchronized). Note that distance of
-~30 cm between microphones makes one microphone to capture signal in
-antiphase to another microphone. That makes the final mix sounding moody.
+these microphones are in phase (synchronized). Note that a distance of
+~30 cm between microphones makes one microphone capture the signal in
+antiphase to the other microphone. That makes the final mix sound moody.
This filter helps to solve phasing problems by adding different delays
to each microphone track and make them synchronized.
Remember that synchronization/delay tolerance depends on sample rate, too.
Higher sample rates will give more tolerance.
-It accepts the following parameters:
+The filter accepts the following parameters:
@table @option
@item mm
Default is 1.
@item temp
-Set temperature degree in Celsius. This is the temperature of the environment.
+Set temperature in degrees Celsius. This is the temperature of the environment.
Default is 20.
@end table
@end table
@end table
+@subsection Commands
+
+This filter supports the following commands:
+@table @option
+@item tempo
+Change filter tempo scale factor.
+Syntax for the command is : "@var{tempo}"
+
+@item pitch
+Change filter pitch scale factor.
+Syntax for the command is : "@var{pitch}"
+@end table
+
@section sidechaincompress
This filter acts like normal compressor but has the ability to compress
@example
silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-90dB
@end example
+
+@item
+Trim all digital silence samples, using peak detection, from beginning to end
+where there is more than 0 samples of digital silence in audio and digital
+silence is detected in all channels at same positions in stream:
+@example
+silenceremove=window=0:detection=peak:stop_mode=all:start_mode=all:stop_periods=-1:stop_threshold=0
+@end example
@end itemize
@section sofalizer
Default is @code{0}.
@end table
+@subsection Commands
+This filter supports same 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 bbox
Compute the bounding box for the non-black pixels in the input frame
top field first will be assumed.
@item deint
-Specify which frames to deinterlace. Accept one of the following
+Specify which frames to deinterlace. Accepts one of the following
values:
@table @option
@end example
@end itemize
+@subsection Commands
+This filter supports same 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 drawgrid
Draw a grid on the input image.
@end example
@end itemize
+@subsection Commands
+This filter supports same 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.
+
@anchor{drawtext}
@section drawtext
Default is @code{-1}.
@end table
+@subsection Commands
+This filter supports same 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 geq
Apply generic equation to each pixel.
Note that this filter is faster than using @ref{overlay} and @ref{pad} filter
to create same output.
-The filter accept the following option:
+The filter accepts the following option:
@table @option
@item inputs
or "bilateral". The default value is "gaussian".
The meaning of @var{param1}, @var{param2}, @var{param3}, and @var{param4}
-depend on the smooth type. @var{param1} and
+depends on the smooth type. @var{param1} and
@var{param2} accept integer positive values or 0. @var{param3} and
@var{param4} accept floating point values.
@end table
@end table
+@section photosensitivity
+Reduce various flashes in video, so to help users with epilepsy.
+
+It accepts the following options:
+@table @option
+@item frames, f
+Set how many frames to use when filtering. Default is 30.
+
+@item threshold, t
+Set detection threshold factor. Default is 1.
+Lower is stricter.
+
+@item skip
+Set how many pixels to skip when sampling frames. Defalt is 1.
+Allowed range is from 1 to 1024.
+
+@item bypass
+Leave frames unchanged. Default is disabled.
+@end table
+
@section pixdesctest
Pixel format descriptor test filter, mainly useful for internal
Alter frame colors in video with pseudocolors.
-This filter accept the following options:
+This filter accepts the following options:
@table @option
@item c0
@code{0x00} for that character. Default is false.
@item lp
-Lowpass lines prior further proccessing. Default is disabled.
+Lowpass lines prior to further processing. Default is disabled.
@end table
@subsection Examples
@end example
@end itemize
+@section scroll
+Scroll input video horizontally and/or vertically by constant speed.
+
+The filter accepts the following options:
+@table @option
+@item horizontal, h
+Set the horizontal scrolling speed. Default is 0. Allowed range is from -1 to 1.
+Negative values changes scrolling direction.
+
+@item vertical, v
+Set the vertical scrolling speed. Default is 0. Allowed range is from -1 to 1.
+Negative values changes scrolling direction.
+
+@item hpos
+Set the initial horizontal scrolling position. Default is 0. Allowed range is from 0 to 1.
+
+@item vpos
+Set the initial vertical scrolling position. Default is 0. Allowed range is from 0 to 1.
+@end table
+
@anchor{selectivecolor}
@section selectivecolor
(right eye left, left eye right)
@item abl
+@item tbl
above-below (left eye above, right eye below)
@item abr
+@item tbr
above-below (right eye above, left eye below)
@item ab2l
+@item tb2l
above-below with half height resolution
(left eye above, right eye below)
@item ab2r
+@item tb2r
above-below with half height resolution
(right eye above, left eye below)
(right eye left, left eye right)
@item abl
+@item tbl
above-below (left eye above, right eye below)
@item abr
+@item tbr
above-below (right eye above, left eye below)
@item ab2l
+@item tb2l
above-below with half height resolution
(left eye above, right eye below)
@item ab2r
+@item tb2r
above-below with half height resolution
(right eye above, left eye below)
Default value is @b{@samp{0}}.
+@item fin_pad
+@item fout_pad
+Set fixed padding for the input/output cubemap. Values in pixels.
+
+Default value is @b{@samp{0}}. If greater than zero it overrides other padding options.
+
@item in_forder
@item out_forder
Set order of faces for the input/output cubemap. Choose one direction for each position.
@table @option
@item h_fov
@item v_fov
-Set horizontal/vertical field of view. Values in degrees.
+@item d_fov
+Set horizontal/vertical/diagonal field of view. Values in degrees.
+
+If diagonal field of view is set it overrides horizontal and vertical field of view.
@end table
@item dfisheye
-Dual fisheye. @i{(input only)}
+Dual fisheye.
Format specific options:
@table @option
@item in_pad
+@item out_pad
Set padding proportion. Values in decimals.
Example values:
@table @option
@item h_fov
@item v_fov
-Set horizontal/vertical field of view. Values in degrees.
+@item d_fov
+Set horizontal/vertical/diagonal field of view. Values in degrees.
+
+If diagonal field of view is set it overrides horizontal and vertical field of view.
@end table
+@item mercator
+Mercator format.
+
+@item ball
+Ball format, gives significant distortion toward the back.
+
+@item hammer
+Hammer-Aitoff map projection format.
+
+@item sinusoidal
+Sinusoidal map projection format.
+
@end table
@item interp
Default resolution depends on formats.
+@item in_stereo
+@item out_stereo
+Set the input/output stereo format.
+
+@table @samp
+@item 2d
+2D mono
+@item sbs
+Side by side
+@item tb
+Top bottom
+@end table
+
+Default value is @b{@samp{2d}} for input and output format.
+
@item yaw
@item pitch
@item roll
@item h_flip
@item v_flip
@item d_flip
-Flip the output video horizontally/vertically/in-depth. Boolean values.
+Flip the output video horizontally(swaps left-right)/vertically(swaps up-down)/in-depth(swaps back-forward). Boolean values.
@item ih_flip
@item iv_flip
@example
ffmpeg -i input.mkv -vf v360=eac:flat:yaw=180 output.mkv
@end example
+@item
+Convert transposed and horizontally flipped Equi-Angular Cubemap in side-by-side stereo format to equirectangular top-bottom stereo format:
+@example
+v360=eac:equirect:in_stereo=sbs:in_trans=1:ih_flip=1:out_stereo=tb
+@end example
@end itemize
@section vaguedenoiser
Note that this filter is faster than using @ref{overlay} and @ref{pad} filter
to create same output.
-The filter accept the following option:
+The filter accepts the following options:
@table @option
@item inputs
Easterbrook for BBC R&D, the Weston 3 field deinterlacing filter
uses filter coefficients calculated by BBC R&D.
-This filter use field-dominance information in frame to decide which
+This filter uses field-dominance information in frame to decide which
of each pair of fields to place first in the output.
If it gets it wrong use @ref{setfield} filter before @code{w3fdif} filter.
-There are two sets of filter coefficients, so called "simple":
+There are two sets of filter coefficients, so called "simple"
and "complex". Which set of filter coefficients is used can
be set by passing an optional parameter:
Default value is @samp{complex}.
@item deint
-Specify which frames to deinterlace. Accept one of the following values:
+Specify which frames to deinterlace. Accepts one of the following values:
@table @samp
@item all
@item xflat
Similar as above, but use different colors.
+@item yflat
+Similar as above, but again with different colors.
+
@item chroma
Displays only chroma.
@item orange
Display orange graticule showing legal broadcast ranges.
+
+@item invert
+Display invert graticule showing legal broadcast ranges.
@end table
@item opacity, o
@section xmedian
Pick median pixels from several input videos.
-The filter accept the following options:
+The filter accepts the following options:
@table @option
@item inputs
All streams must be of same pixel format.
-The filter accept the following option:
+The filter accepts the following options:
@table @option
@item inputs
Multiple values can be used when separated by '+'. In such
case values are summed together.
+Note that if inputs are of different sizes gaps may appear, as not all of
+the output video frame will be filled. Similarly, videos can overlap each
+other if their position doesn't leave enough space for the full frame of
+adjoining videos.
+
For 2 inputs, a default layout of @code{0_0|w0_0} is set. In all other cases,
a layout must be set by the user.
@itemize
@item
-Display 4 inputs into 2x2 grid,
-note that if inputs are of different sizes unused gaps might appear,
-as not all of output video is used.
+Display 4 inputs into 2x2 grid.
+
+Layout:
+@example
+input1(0, 0) | input3(w0, 0)
+input2(0, h0) | input4(w0, h0)
+@end example
+
@example
xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0
@end example
+Note that if inputs are of different sizes, gaps or overlaps may occur.
+
@item
-Display 4 inputs into 1x4 grid,
-note that if inputs are of different sizes unused gaps might appear,
-as not all of output video is used.
+Display 4 inputs into 1x4 grid.
+
+Layout:
+@example
+input1(0, 0)
+input2(0, h0)
+input3(0, h0+h1)
+input4(0, h0+h1+h2)
+@end example
+
@example
xstack=inputs=4:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2
@end example
+Note that if inputs are of different widths, unused space will appear.
+
+@item
+Display 9 inputs into 3x3 grid.
+
+Layout:
+@example
+input1(0, 0) | input4(w0, 0) | input7(w0+w3, 0)
+input2(0, h0) | input5(w0, h0) | input8(w0+w3, h0)
+input3(0, h0+h1) | input6(w0, h0+h1) | input9(w0+w3, h0+h1)
+@end example
+
+@example
+xstack=inputs=9:layout=0_0|0_h0|0_h0+h1|w0_0|w0_h0|w0_h0+h1|w0+w3_0|w0+w3_h0|w0+w3_h0+h1
+@end example
+
+Note that if inputs are of different sizes, gaps or overlaps may occur.
+
@item
-Display 9 inputs into 3x3 grid,
-note that if inputs are of different sizes unused gaps might appear,
-as not all of output video is used.
+Display 16 inputs into 4x4 grid.
+
+Layout:
+@example
+input1(0, 0) | input5(w0, 0) | input9 (w0+w4, 0) | input13(w0+w4+w8, 0)
+input2(0, h0) | input6(w0, h0) | input10(w0+w4, h0) | input14(w0+w4+w8, h0)
+input3(0, h0+h1) | input7(w0, h0+h1) | input11(w0+w4, h0+h1) | input15(w0+w4+w8, h0+h1)
+input4(0, h0+h1+h2)| input8(w0, h0+h1+h2)| input12(w0+w4, h0+h1+h2)| input16(w0+w4+w8, h0+h1+h2)
+@end example
+
@example
-xstack=inputs=9:layout=w3_0|w3_h0+h2|w3_h0|0_h4|0_0|w3+w1_0|0_h1+h2|w3+w1_h0|w3+w1_h1+h2
+xstack=inputs=16:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2|w0_0|w0_h0|w0_h0+h1|w0_h0+h1+h2|w0+w4_0|
+w0+w4_h0|w0+w4_h0+h1|w0+w4_h0+h1+h2|w0+w4+w8_0|w0+w4+w8_h0|w0+w4+w8_h0+h1|w0+w4+w8_h0+h1+h2
@end example
+
+Note that if inputs are of different sizes, gaps or overlaps may occur.
+
@end itemize
@anchor{yadif}
top field first will be assumed.
@item deint
-Specify which frames to deinterlace. Accept one of the following
+Specify which frames to deinterlace. Accepts one of the following
values:
@table @option
top field first will be assumed.
@item deint
-Specify which frames to deinterlace. Accept one of the following
+Specify which frames to deinterlace. Accepts one of the following
values:
@table @option
@end itemize
+@section sierpinski
+
+Generate a Sierpinski carpet/triangle fractal, and randomly pan around.
+
+This source accepts the following options:
+
+@table @option
+@item size, s
+Set frame size. For the syntax of this option, check the @ref{video size syntax,,"Video
+size" section in the ffmpeg-utils manual,ffmpeg-utils}. Default value is "640x480".
+
+@item rate, r
+Set frame rate, expressed as number of frames per second. Default
+value is "25".
+
+@item seed
+Set seed which is used for random panning.
+
+@item jump
+Set max jump for single pan destination. Allowed range is from 1 to 10000.
+
+@item type
+Set fractal type, can be default @code{carpet} or @code{triangle}.
+@end table
+
@c man end VIDEO SOURCES
@chapter Video Sinks
scope.
The filter is used to measure the difference between channels of stereo
-audio stream. A monoaural signal, consisting of identical left and right
+audio stream. A monaural signal, consisting of identical left and right
signal, results in straight vertical line. Any stereo separation is visible
as a deviation from this line, creating a Lissajous figure.
If the straight (or deviation from it) but horizontal line appears this
@item expr
Values are interpreted as floats, returns true if expression from option @code{expr}
evaluates to true.
+
+@item ends_with
+Values are interpreted as strings, returns true if metadata value ends with
+the @code{value} option string.
@end table
@item expr
option instead.
@item font
-Specify fontconfig pattern. This has lower priority than @var{fontfile}.
-The : in the pattern may be replaced by | to avoid unnecessary escaping.
+Specify fontconfig pattern. This has lower priority than @var{fontfile}. The
+@code{:} in the pattern may be replaced by @code{|} to avoid unnecessary
+escaping.
@item fontcolor
Specify font color expression. This is arithmetic expression that should return
@section spectrumsynth
-Sythesize audio from 2 input video spectrums, first input stream represents
+Synthesize audio from 2 input video spectrums, first input stream represents
magnitude across time and second represents phase across time.
The filter will transform from frequency domain as displayed in videos back
to time domain as presented in audio output.
projects / ffmpeg / blobdiff