Apply audio surround upmix filter.
This filter allows to produce multichannel output from audio stream.
The filter accepts the following options:
- chl_out
-
Set output channel layout. By default, this is 5.1.
See the Channel Layout section in the ffmpeg-utils(1) manual for the required syntax.
- chl_in
-
Set input channel layout. By default, this is stereo.
See the Channel Layout section in the ffmpeg-utils(1) manual for the required syntax.
- level_in
-
Set input volume level. By default, this is 1.
- level_out
-
Set output volume level. By default, this is 1.
- lfe
-
Enable LFE channel output if output channel layout has it. By default, this is enabled.
- lfe_low
-
Set LFE low cut off frequency. By default, this is 128 Hz.
- lfe_high
-
Set LFE high cut off frequency. By default, this is 256 Hz.
- fc_in
-
Set front center input volume. By default, this is 1.
- fc_out
-
Set front center output volume. By default, this is 1.
- lfe_in
-
Set LFE input volume. By default, this is 1.
- lfe_out
-
Set LFE output volume. By default, this is 1.