[mythtv-users] NVP: prebuffering pause & Audio buffer overflow

[WR]

mythtv-0.19_p9163-r1 running on a frontend-only machine (matching version on 
remote backend)

this:
$ aplay -D spdif foo.wav 
works perfectly, audio plays from spdif out.

but if I set mythtv Audio Output Device to ALSA:spdif, I hear one short burst 
of audio, then nothing while the "prebuffering pause" and overflow errors 
continues endlessly.

Any idea how to fix this?
THANKS

2006-07-28 15:26:25.348 NVP: prebuffering pause
2006-07-28 15:26:25.350 WriteAudio: buffer underrun
2006-07-28 15:26:25.734 NVP: prebuffering pause
2006-07-28 15:26:26.121 NVP: prebuffering pause
2006-07-28 15:26:26.507 NVP: prebuffering pause
2006-07-28 15:26:26.894 NVP: prebuffering pause
2006-07-28 15:26:27.281 NVP: prebuffering pause
2006-07-28 15:26:27.667 NVP: prebuffering pause
2006-07-28 15:26:28.174 NVP: prebuffering pause
2006-07-28 15:26:28.560 NVP: prebuffering pause
2006-07-28 15:26:28.581 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.583 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.586 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.587 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.589 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.592 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.592 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.595 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.599 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.602 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.603 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.605 NVP::AddAudioData():p1: Audio buffer overflow, audio 
data lost!
2006-07-28 15:26:28.960 NVP: prebuffering pause