[MPlayer-users] pan from stereo to surround 5.1

Hugo Ferreira hmf at netvisao.pt
Sat Apr 5 12:21:25 CEST 2003


I am working under the assumption that you are trying standard analog output.

Several of us have already detected this problem. I you are using "alsa" sound 
drivers, please try the following commands and give us your feedback. I am 
interested in two things: a) if you get output in the various speakers. b) if 
you have any A/V synchronization problems. c) Are your sources back-ups (what 
tool was used) or originals.

/usr/local/bin/mplayer -ao alsa9 -vo xv -dvd 1 -channels 2
/usr/local/bin/mplayer -ao alsa9 -vo xv -dvd 1
/usr/local/bin/mplayer -ao alsa9:surround51 -vo xv -dvd 1 -channels 6
/usr/local/bin/mplayer -ao alsa9:surround40 -vo xv -dvd 1 -channels 4

I have been told that the problem has _not_ been diagnosed properly. The 
problem could be in the alsa, liba52 or mplayer code. 


On Friday 04 April 2003 08:42 pm, Damjan Lango wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
> I would like to send a stereo audio to 5.1 surround in
> this way:
> front left <- left
> rear left <- left
> center <- 0.5 left + 0.5 right
> front right <- right
> rear right <- right
> subwoofer <- lowpass filter of (left+right)
> I tried playing with the pan filter but I don't seem
> to make it to work, the documentation in sound.html,
> chapter is not very explanatory and the
> examples are strange too. Can somebody write the pan
> filter options for a setup like the above?
> I have a SB Live and if I let the card route the
> stereo signal then I get nothing in the front speaker
> so that's why I am bothering with this.
> ciao,
> Damjan
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