--- SpikeyGG [EMAIL PROTECTED] wrote:
From: Michael Carland [EMAIL PROTECTED]
I seem to have all of my install mistakes corrected, except for one.
When I play recorded content all is well. But when I play live TV, I
get
many prebuffering pause messages, and an occasional WriteAudio:
buffer
underrun. The video stutters during the prebuffering messages.
I done some googling, and tried a few things, but have not been able to
get around this. I am looking for tips on how to find the source of the
problem.
I have tried vmstat on both the frontend and the backend, and don't see
anything that stands out. No swapping, plenty of memory, at least 20%
idle
cpu on both ends.
I have the Extra audio buffering checked. I tried the Aggresive
Soundcard Buffering, but it didn't help, so I turned it back off.
I am using ALSA on the frontend, and other than the stutters, it sounds
fine.
I have a similar problem:
I've found that when I use ALSA without the Extra audio buffering it
gives
me lots of this:
2005-03-28 11:54:27.415 WriteAudio: buffer underrun
2005-03-28 11:54:28.202 WriteAudio: buffer underrun
2005-03-28 11:54:34.626 WriteAudio: buffer underrun
2005-03-28 11:54:34.924 WriteAudio: buffer underrun
2005-03-28 11:54:37.762 WriteAudio: buffer underrun
The audio on certian channels is crackly and the video is jumpy. You
can
see from the timestamps that these babys fill up the logfile very
quickly.
And if I enable the Extra audio buffering with ALSA it gives me lots
of
this:
2005-03-28 11:56:04.449 prebuffering pause
2005-03-28 11:56:06.250 prebuffering pause
2005-03-28 11:56:07.685 prebuffering pause
2005-03-28 11:56:08.621 prebuffering pause
2005-03-28 11:56:09.637 prebuffering pause
The audio skips ever so slightly and so does the video but it's better
than
the buffer undderrun. The prebuffering pause messages come once a
second...
much slower than the underruns.
I haven't figured out how to fix either of these problems. I'm running
MythTV from CVS, with a pcHDTV HD-3000 card. Most of the time I just
use
/dev/dsp but I've been wanting to use the ALSA because when I get a new
reciever I'll be using the ALSA digital option to send it out the
optical
port. Plus, I'd like to use a mixed audio driver so I never get caught
with
the audio device is in use message. My hardware is nForce3 built-in
sound
on my motherboard.
Thanks,
-Greg
One thing I have noticed in the logs that are different between live tv
and playing recorded content. Live tv has:
2005-03-28 20:24:28.249 Using protocol version 14
2005-03-28 20:24:28.303 Using protocol version 14
in the logs, but recorded content does not. I perused the list archive
while I was waiting for my hardware to arrive, and remember reading
something about playing from NFS works better than playing over the Myth
protocol. I do have an NFS share/mount between the backend/frontend. Might
those protocol version 14 messages imply that live tv is using the
protocol for video transfer instead of NFS, and that is why live tv
doesn't work as well as playing prerecorded video?
-Michael
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