@end table
@section acontrast
-Simple audio dynamic range commpression/expansion filter.
+Simple audio dynamic range compression/expansion filter.
The filter accepts the following options:
@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.
+If any two samples detected as noise are spaced less than this value then any
+sample between those two samples will be also detected as noise.
@item m
Set overlap method.
Unused delays will be silently ignored. If number of given delays is
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.
@end table
@subsection Examples
select double-exponential sigmoid
@item losi
select logistic sigmoid
+@item nofade
+no fade applied
@end table
@end table
It can be used as component for digital crossover filters,
room equalization, cross talk cancellation, wavefield synthesis,
-auralization, ambiophonics and ambisonics.
+auralization, ambiophonics, ambisonics and spatialization.
This filter uses second stream as FIR coefficients.
If second stream holds single channel, it will be used
Allowed range is 0.1 to 60 seconds.
@item response
-Show IR frequency reponse, magnitude(magenta) and phase(green) and group delay(yellow) in additional video stream.
+Show IR frequency response, magnitude(magenta), phase(green) and group delay(yellow) in additional video stream.
By default it is disabled.
@item channel
Set video stream frame rate. This option is used only when @var{response} is enabled.
@item minp
-Set minimal partition size used for convolution. Default is @var{16}.
-Allowed range is from @var{16} to @var{65536}.
+Set minimal partition size used for convolution. Default is @var{8192}.
+Allowed range is from @var{8} 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{65536}.
-Allowed range is from @var{16} to @var{65536}.
-Lower values decreases latency at cost of higher CPU usage.
+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.
@end table
@subsection Examples
@item r
Set kind of processing.
-Can be @code{d} - direct or @code{s} - serial cascading. Defauls is @code{s}.
+Can be @code{d} - direct or @code{s} - serial cascading. Default is @code{s}.
@item e
Set filtering precision.
@end table
@item response
-Show IR frequency reponse, magnitude and phase in additional video stream.
+Show IR frequency response, magnitude and phase in additional video stream.
By default it is disabled.
@item channel
@itemize
@item
-Apply 2 pole elliptic notch at arround 5000Hz for 48000 Hz sample rate:
+Apply 2 pole elliptic notch at around 5000Hz for 48000 Hz sample rate:
@example
aiir=k=1:z=7.957584807809675810E-1 -2.575128568908332300 3.674839853930788710 -2.57512875289799137 7.957586296317130880E-1:p=1 -2.86950072432325953 3.63022088054647218 -2.28075678147272232 6.361362326477423500E-1:f=tf:r=d
@end example
asendcmd=c='4.0 anequalizer change 0|f=200|w=50|g=1',anequalizer=...
@end table
+@section anlmdn
+
+Reduce broadband noise in audio samples using Non-Local Means algorithm.
+
+Each sample is adjusted by looking for other samples with similar contexts. This
+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.
+
+@table @option
+@item s
+Set denoising strength. Allowed range is from 0.00001 to 10. Default value is 0.00001.
+
+@item p
+Set patch radius duration. Allowed range is from 1 to 100 milliseconds.
+Default value is 2 milliseconds.
+
+@item r
+Set research radius duration. Allowed range is from 2 to 300 milliseconds.
+Default value is 6 milliseconds.
+
+@item o
+Set the output mode.
+
+It accepts the following values:
+@table @option
+@item i
+Pass input unchanged.
+
+@item o
+Pass noise filtered out.
+
+@item n
+Pass only noise.
+
+Default value is @var{o}.
+@end table
+@end table
+
@section anull
Pass the audio source unchanged to the output.
@item reset
Set number of frame after which stats are going to be recalculated.
Default is disabled.
+
+@item measure_perchannel
+Select the entries which need to be measured per channel. The metadata keys can
+be used as flags, default is @option{all} which measures everything.
+@option{none} disables all per channel measurement.
+
+@item measure_overall
+Select the entries which need to be measured overall. The metadata keys can
+be used as flags, default is @option{all} which measures everything.
+@option{none} disables all overall measurement.
+
@end table
A description of each shown parameter follows:
each amovie filter use stereo file with IR coefficients as input.
The files give coefficients for each position of virtual loudspeaker:
@example
-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"
+ffmpeg -i input.wav
+-filter_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];[0:a][fl][fr][fc][lfe][bl][br][sl][sr]headphone=FL|FR|FC|LFE|BL|BR|SL|SR"
output.wav
@end example
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"
+ffmpeg -i input.wav -filter_complex "amovie=minp.wav[hrirs];[0:a][hrirs]headphone=map=FL|FR|FC|LFE|BL|BR|SL|SR:hrir=multich"
output.wav
@end example
@end itemize
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
+Set threshold for difference amplification. Any difference greater or equal to
this value will not alter source pixel. Default is 10.
Allowed range is from 0 to 65535.
+@item tolerance
+Set tolerance for difference amplification. Any difference lower to
+this value will not alter source pixel. Default is 0.
+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 sigma
Set denoising strength. Default value is 1.
Allowed range is from 0 to 999.9.
-The denoising algorith is very sensitive to sigma, so adjust it
+The denoising algorithm is very sensitive to sigma, so adjust it
according to the source.
@item block
Set horizontal sigma, standard deviation of Gaussian blur. Default is @code{0.5}.
@item steps
-Set number of steps for Gaussian approximation. Defauls is @code{1}.
+Set number of steps for Gaussian approximation. Default is @code{1}.
@item planes
Set which planes to filter. By default all planes are filtered.
@item sigma
The standard deviation of Gaussian blur to be applied on the scene. Must be
chosen in the range [0,1024.0] and default value = 1. floor( @var{sigma} * break_off_sigma(3) )
-can't be euqal to 0 if @var{difford} is greater than 0.
+can't be equal to 0 if @var{difford} is greater than 0.
@end table
@subsection Examples
By default value 0xf, all planes will be processed.
@end table
+@section maskfun
+Create mask from input video.
+
+For example it is useful to create motion masks after @code{tblend} filter.
+
+This filter accepts the following options:
+
+@table @option
+@item low
+Set low threshold. Any pixel component lower or exact than this value will be set to 0.
+
+@item high
+Set high threshold. Any pixel component higher than this value will be set to max value
+allowed for current pixel format.
+
+@item planes
+Set planes to filter, by default all available planes are filtered.
+
+@item fill
+Fill all frame pixels with this value.
+
+@item sum
+Set max average pixel value for frame. If sum of all pixel components is higher that this
+average, output frame will be completely filled with value set by @var{fill} option.
+Typically useful for scene changes when used in combination with @code{tblend} filter.
+@end table
+
@section mcdeint
Apply motion-compensation deinterlacing.
@table @option
@item s
-Set denoising strength.
+Set denoising strength. Default is 1.0. Must be in range [1.0, 30.0].
@item p
-Set patch size.
+Set patch size. Default is 7. Must be odd number in range [0, 99].
@item pc
Same as @option{p} but for chroma planes.
The default value is @var{0} and means automatic.
@item r
-Set research size.
+Set research size. Default is 15. Must be odd number in range [0, 99].
@item rc
Same as @option{r} but for chroma planes.
@end table
@item color_trc
-Set the color transfert.
+Set the color transfer.
Available values are:
@table @samp
@item 3rdiv
Set multiplier for calculated value for each plane.
If unset or 0, it will be sum of all matrix elements.
-The option value must be an float number greater or equal to @code{0.0}. Default value is @code{1.0}.
+The option value must be a float number greater or equal to @code{0.0}. Default value is @code{1.0}.
@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.
-The option value must be an float number greater or equal to @code{0.0}. Default value is @code{0.0}.
+The option value must be a float number greater or equal to @code{0.0}. Default value is @code{0.0}.
@end table
@item threshold
The tonemapping algorithm parameters is fine-tuned per each scene. And a threshold
-is used to detect whether the scene has changed or not. If the distance beween
+is used to detect whether the scene has changed or not. If the distance between
the current frame average brightness and the current running average exceeds
a threshold value, we would re-calculate scene average and peak brightness.
The default value is 0.2.
It shall assume one of following values:
@table @option
@item iteration_count
-Set iteration cound mode.
+Set iteration count mode.
@item normalized_iteration_count
set normalized iteration count mode.
@end table
@item acount
Set how much frames to accumulate in histogram.
-Defauls is 1. Setting this to -1 accumulates all frames.
+Default is 1. Setting this to -1 accumulates all frames.
@item rheight
Set histogram ratio of window height.
filter outputs, but can synthesize sound from other spectrograms too.
But in such case results are going to be poor if the phase data is not
available, because in such cases phase data need to be recreated, usually
-its just recreated from random noise.
+it's just recreated from random noise.
For best results use gray only output (@code{channel} color mode in
@ref{showspectrum} filter) and @code{log} scale for magnitude video and
@code{lin} scale for phase video. To produce phase, for 2nd video, use
projects / ffmpeg / blobdiff