[MPlayer-users] Software AC3 Decoding with CM8738

[Stefan Lange]

Hi!
I'm experiencing a weird situation when I'm playing files with 
AC3-audio with mplayer. I'm using the analog outputs of my soundcard 
(CMedia CM 8783) with mplayer's software AC3 decoder. Playing back 
5.1-sound with "-channels=6" works fine, but if I pause and unpause 
during playback, channels are switched. For example:

Start playing (center output comes from center) --> pause --> unpause 
--> center comes from front left or rear left

If I continue pausing/unpausing center-content will be swapped again, 
and be back at center. I have not been able to reproduce any specific 
pattern in which way the channels are exchanged during the 
pause/unpause process. This isn't a big problem, just a bit weird. I'm 
just wondering if anybody else can reproduce that behaviour.

I have experienced this with ANY file containing AC3 audio so far, no 
matter if avi or DVD

Some details of my configuration:

Software:

-Mplayer CVS from 05.05.2002, compiled with 
--disable-runtime-cpudetection and --disable-gl
-Debian Unstable, updated on 05.05.2002
-2.4.18 without any patches
-libc-2.2.5
-XFree86 4.2.0 with ati.2-drivers from gatos.sf.net
-gcc version 2.95.4 20011002 (Debian prerelease)
-GNU ld version 2.12.90.0.1 20020307 Debian/GNU Linux
-GNU assembler 2.12.90.0.1 20020307 Debian/GNU Linux

Hardware:

CPU: AMD AthlonXP 1800+
Video Card: FIC Radeon 8500LE (XF86 4.2.0 with Gatos Drivers)
Sound Card: Trust Soundexpert Digital Surround, Chipset: CMI8738-6MX 
(Kernel driver from 2.4.18, compiled as module, loaded with insmod 
option speakers=6)

Sample mplayer-output is attached.

~/.mplayer/config is:

# Write your default config options here!
# Video Out: SDL
vo=sdl
# Vollbild
fs=yes
# Kein Timer im OSD
osdlevel=1
vfm=5
# Frames droppen, falls CPU zu lahm
framedrop=yes
# korrektes Vollbild in icewm
fsmode=1
# post-processing
autoq=100
# audio:
#aop=list=volume,surround,volnorm
aop=list=volume,volnorm
channels=6
npp=de