FFmpeg 3.4.13
Since* 3.4
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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.