[MPlayer-dev-eng] WAVE_FORMAT_EXTENSIBLE doesn't get added by mplayer during dumping to multichannel WAV

[Grozdan]

Hi,

It seems that mplayer, when using -ao pcm to dump audio to a WAV, does not
add WAVE_FORMAT_EXTENSIBLE extension which results in FLAC encode failure if
the dumped WAV file has > 2 audio channels.

How to reproduce?

mplayer somefile.avi -channels 6 -vo null -vc null -ao
pcm:fast:file=$HOME/output.wav
flac -5 $HOME/output.wav -o $HOME/output.flac

The above results in flac erroring out with the following message

audio.wav: ERROR: WAVE has >2 channels but is not WAVE_FORMAT_EXTENSIBLE;
cannot assign channels

Dumping 2 channels audio with mplayer to a WAV, does not result in any
problems though, and flac has no issues either. Can this be fixed or is
there a known workaround?

Thanks