[mythtv-users] Tips for fixing prebuffering pause and WriteAudio:
mythtv at mattp.name
Mon Mar 28 02:41:17 UTC 2005
On 28/03/2005, at 9:15 AM, Michael Carland wrote:
> 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
> many "prebuffering pause" messages, and an occasional "WriteAudio:
> 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
> 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%
> 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
I had a very similar problem which cropped up after switching to ALSA
output. After a long saga of list-trawling, it turned out to be an
error with an uninitialised variable in Myth's ALSA audio module (I so
wish C++ would regard this sort of thing as an error). After grabbing a
patch from CVS and rebuilding, all is fixed.
The patch against 0.17 is attached. Since we have the same frontend hw,
I could look into making the (RPM) binaries available if there's
somewhere to drop them.
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