Hi, I am using iec958 spdif output on gigabyte ga-965-ds3 motherboard with onboard hda-intel, kernel 2.6.18.6 alsa 1.0.13, I dont have a asound.conf or asoundrc. Most of my sound is coming from mythtv (ac3 and dts passthru enabled), this works really well provided I run the following commands (just once) before running myth:
amixer set IEC958 mute aplay -D spdif /usr/share/sounds/alsa/Front_Center.wav amixer set IEC958 unmute I dont know why that is necessary but without it I get silence or "helecopter" noises, I think the aplay command actually errors as well, it certainly doesnt output any sound, which is even stranger.. Anyway thats not the problem, the problem is that a small number of programmes that I watch have mono audio, when myth attempts to play them back I get the following error and no sound: 2006-12-26 16:22:46.585 Opening ALSA audio device 'iec958'. 2006-12-26 16:22:46.586 AudioOutput Error: Channels count (1) not available: Invalid argument 2006-12-26 16:22:46.586 AudioOutput Error: Unable to set ALSA parameters I understand why this happens, iec958 does not support mono audio, either its simply not possible or not supported on my chipset, Ive tried changing options in myth but it doesnt make any difference, it always tries to set the channel count to 1. I have asked on the myth mailing list but nobody has been able to help, I wonder if anything can be done from the alsa side of things? Perhaps alsa could be configured to accept mono audio on the iec958 and to resample it to 2 channel? Andy ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
