[mythtv-users] Alsa spdif out?

Ian Westcott ijw1 at pacbell.net
Tue Apr 1 17:14:38 EST 2003


On Tue, Apr 01, 2003 at 11: 08:50AM +0100, Edward Wildgoose wrote:

> > Has anyone gotten such a thing to work for MythTV?                                                                                        
>                                                                                                                                             
                                                                                                                                              
> A few days ago someone had problems with spdif, and it turned out to be                                                                     
> because audio was sampled at 32Khz which the amp couldn't decode.  The                                                                      
> solution was to choose 44Khz as the record frequency.                                                                                       
                                                                                                                                              
Nope, this problem is even a little more basic than that. The only way                                                                        
I've found to play audio through the digital out (at least with the intel8x0 alsa driver I've used) has been to
either use aplay and specify spdif as the PCM device, or specify spdif in                                                                     
an application that knows more about alsa (like xine). mythfrontend                                                                           
doesn't seem to know about alsa (it's not linked against alsa libs), and                                                                      
the only way to specify how to play sound is through a device file,                                                                           
/dev/dsp by default (and in fact, when I tried to specify a different                                                                         
device file, /dev/snd/pcmC0D0p just to see what happened, mythtv changed                                                                      
it back to /dev/dsp). Maybe I should look at mythfrontend and see if I                                                                        
can add some more alsa functionality..                                                                                                        

Ian


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