#385 multichannel flac in videos

[Nick Charitidis]

For some reason multichannel flac doesn't work when is a part of a video file. It only plays when the win32 audio output driver is selected which is not really convenient (for example when i'm using only 2 speakers with win32 it i only hear the front 2 channels and not a downmixed version).

However when the same flac file is played as an audio file it plays fine.