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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 30 |
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diff --git a/doc/filters.texi b/doc/filters.texi index 107fe61..51fb6cd 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -3792,6 +3792,36 @@ channels. Default is 0.3. Set level of input signal of original channel. Default is 0.8. @end table +@section surround +Apply audio surround upmix filter. + +This filter allows to produce multichannel output from stereo audio stream. + +The filter accepts the following options: + +@table @option +@item chl_out +Set output channel layout. By default, this is @var{5.1}. + +See @ref{channel layout syntax,,the Channel Layout section in the ffmpeg-utils(1) manual,ffmpeg-utils} +for the required syntax. + +@item level_in +Set input volume level. By default, this is @var{1}. + +@item level_out +Set output volume level. By default, this is @var{1}. + +@item lfe +Enable LFE channel output if output channel layout has it. By default, this is enabled. + +@item lfe_low +Set LFE low cut off frequency. By default, this is @var{128} Hz. + +@item lfe_high +Set LFE high cut off frequency. By default, this is @var{256} Hz. +@end table + @section treble Boost or cut treble (upper) frequencies of the audio using a two-pole |
