During playback,
- ( and ) keys: Adjust audio balance in favor of left/right channel.
- # key: Cycle through the available audio tracks.
You can add, remove, route, or copy audio channels with the -af channels=nch[:nr:from1:to1:from2:to2:from3:to3:...] option. For example, if there are 2 channels, and you want to copy channel 0 to channel 1 (and thus abandon the original channel 1), you can use -af channels=2:2:0:0:0:1.
You can even mix the channels with specified proportions with the -af pan=... option. Unfortunately, the suboptions are naturally much more complicated. Basically you can specify a 2D matrix to indicate the amount of each source channel that will be mixed to the destination channel.
References:
- man page of mplayer (with very helpful examples.) (Online: http://www.mplayerhq.hu/DOCS/man/en/mplayer.1.html)
- http://www.mplayerhq.hu/DOCS/HTML/en/advaudio-surround.html
- http://www.mplayerhq.hu/DOCS/HTML/en/advaudio-channels.html
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