I also have a ice1712/envy24-based card, and had a similar problem using dmix with mplayer, and probably still have, I did not check for a while though. Everything works fine using a sample rate of 44100 Hz, but using 48000 Hz fails with the same error message.I always get the error: "Unable to set hw params for playback: Invalid argument"
<.asoundrc>
pcm.dmixer {
type dmix
ipc_key 1024
slave {
pcm "hw:0,0"
period_time 0
period_size 1024
buffer_size 4096 # buffer size < 6653, but pow(x, 2)
rate 48000
}
Have you tried to set the rate to 44100 in your .asoundrc? I don't know about mythtv, but with mplayer that's the only samplerate where dmix works for me (using the same buffer_size and period_size).
gruss, Steffen
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