[mythtv] Ticket #5473: audio out, PulseAudio
cal at graggrag.com
Sat Dec 27 12:22:45 UTC 2008
> I've back-ported this patch to 0.21+fixess18722 (for Ubuntu Intrepid).
> Aside from the re-factoring required to deal with using QT3 rather than
> QT4, and the MythTV changes, I found a few issues some of which are not
> yet resolved:
> Not yet resolved:
> 4. Occasional "!PulseAudio Error: stream buffer underflow" reports. No
> clues to the reason yet.
Yeah, I've seen those too, and haven't been able to raise a theory. I even
wondered if they might be benign, but that's asking a lot.
> 5. Occasional bursts of static when changing to new channel (sounds like a
> 16-bit sample getting out of step by 8 bits). This will sometimes self-
> correct (another 8 bits dropped would align the samples correctly again).
As yet I haven't tracked it further up, but I'm wondering just what sort of
audio and related commands get pumped out by the app as a session (or channel
change fires up. It's been a while since I messed with it, but I vaguely recall
traffic through WriteAudio at unexpected times, and a strange sequence of resets,
with maybe even a pause thrown in.
> I'll attach the current patch I'm using in Ubuntu Intrepid and update as I
> make progress with the discovered issues.
good effort, nice to see someone taking it forward!
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