[MPlayer-dev-eng] mplayer sets number of channels incorrectly

[attila]

On Fri, Mar 19, 2004 at 02:34:55PM +0000, Alexander Macdonald wrote:
> 
> I have a surround sound setup so when I play a 2-channel sound I'd like it 
> to be upmixed(just copy the channels, nothing fancy) alsa does this nicely 
> for me. However when I play a dvd or something with 5.1 sound mplayer 
> downmixes it to 2 channels , I can get around this by passing mplayer 
> "-channels 6" and it correctly plays the file . the problem is that when I 
> play a 2 channel file with "-channels 6" mplayer sticks in blank channels 
> which stops the upmixing from happening..... Is there any way I can tell 
> mplayer to just use the number of channels from the file? Or do I just not 
> understand what is going on?

Does MPlayer automaticaly downmix anything to two channels ?
If so, this is a serious bug, downmix should only happen if 
the ao driver cannot provide as many channels as needed.
Can someone please have a look at this ?

(sorry, cant do it myself as i dont have any sample files
here and i also dont have the time to read the code)


			Attila Kinali