To: "Discussion about mythtv" <[email protected]>
Sent: Thursday, March 31, 2005 1:02 AM
Subject: [mythtv-users] AC3 passthrough is failing in certain circumstances
I have a few video files that have Dolby AC3 encoding. When I try to play them with xine or gmplayer, they play back just fine in full 5.1 glory; however mplayer does not do likewise. mplayer will either spit out the following message and exit or display the message and continue playing the clip with no sound:
ALSA lib setup.c:548:(add_elem) Cannot obtain info for CTL elem (MIXER,'IEC958 Playback AC97-SPSA',0,0,0): No such file or directory
I've tried many different variations of -ac hwac3, and -ao alsa:default but all seem to either cause mplayer to exit or to play w/o sound. Now, the error message seems to indicate that there is no mixer control labeled IEC958.... and that is true. The problem is that I cannot seem to find out why it is looking for that specific mixer.
I have a 7NIF2 and am using the onboard soundcard. Absolutely everything else is working fine (2 channel and 5.1 surround on xine, 2 channel on mplayer; in recordings, videos, dvds, etc.). I'm running 0.17 from ATRPMs on FC3.
I know I'm just replying to my message but I figured I'd post the solution I figured out. Even though I used the website recommended on Jarod's site to set up my .asoundrc, it seems like mplayer did not like my "default" alsa device (even though both xine (alsa:default) and gmplayer ("alsa" and all settings set to "default") had no problem). Passing -ao alsa:device=hw=0.2 to mplayer solved this problem.
Thanks goes to Beirdo on #mythtv-users for telling me to "ask some mplayer experts" and Ikarus on #mplayer for telling me to "find out what ao gmplayer is using and copy that to mplayer..." Eventually, the man page for mplayer (HUGE, btw) finally yielded the device= line. If anybody has any idea why mplayer doesn't like my "default" alsa device, I'd be interested in figuring out (though I don't really care that much now that it is working properly).
Matt
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