[mythtv-users] Playback problems after upgrading from SVN 13635 to 13769

[Matt]

On 6/27/07, Matt <skd5aner at gmail.com> wrote:
> I just upgraded to latest SVN yesterday on both my frontend and
> backend.  I did experience some issues with sound after the upgrade,
> so I also upgraded Alsa from 14RC3 to 14 final.  Other than that,
> nothing else changed.
>
> However, watching recordings is now almost unbearable.  Every few
> seconds the video and audio stutters.  Here is my frontend log with no
> extra verbosity turned on.
>
>
> 2007-06-26 21:24:14.738 TV: Changing from None to WatchingPreRecorded
> 2007-06-26 21:24:14.828 Video timing method: USleep with busy wait
> 2007-06-26 21:24:16.014 WriteAudio: buffer underrun
> 2007-06-26 21:24:16.035 WriteAudio: buffer underrun
> 2007-06-26 21:24:16.082 NVP: prebuffering pause
> 2007-06-26 21:24:16.376 WriteAudio: buffer underrun
> 2007-06-26 21:24:16.397 WriteAudio: buffer underrun
> 2007-06-26 21:24:16.426 NVP: prebuffering pause
> 2007-06-26 21:24:16.418 WriteAudio: buffer underrun
> 2007-06-26 21:24:16.748 WriteAudio: buffer underrun
> 2007-06-26 21:24:16.769 WriteAudio: buffer underrun
> 2007-06-26 21:24:16.806 NVP: prebuffering pause
> 2007-06-26 21:24:17.151 WriteAudio: buffer underrun
> 2007-06-26 21:24:17.171 WriteAudio: buffer underrun
> 2007-06-26 21:24:17.209 NVP: prebuffering pause
> 2007-06-26 21:24:21.198 AO: Using time stretch 1.05
> 2007-06-26 21:24:21.739 AO: Changing time stretch to 1.1
> 2007-06-26 21:24:22.148 AO: Changing time stretch to 1.15
> 2007-06-26 21:24:22.592 AO: Changing time stretch to 1.2
> 2007-06-26 21:24:23.123 AO: Changing time stretch to 1.25
> 2007-06-26 21:24:23.751 AO: Changing time stretch to 1.3
> 2007-06-26 21:24:24.113 AO: Changing time stretch to 1.35
> 2007-06-26 21:24:24.967 AO: Changing time stretch to 1.4
> 2007-06-26 21:24:25.671 NVP: prebuffering pause
> 2007-06-26 21:24:27.302 NVP: prebuffering pause
> 2007-06-26 21:24:28.601 NVP: prebuffering pause
> 2007-06-26 21:24:31.304 NVP: prebuffering pause
> 2007-06-26 21:24:33.023 NVP: prebuffering pause
> 2007-06-26 21:24:51.670 NVP: prebuffering pause
> 2007-06-26 21:24:53.298 NVP: prebuffering pause
> 2007-06-26 21:24:53.317 WriteAudio: buffer underrun
> 2007-06-26 21:24:53.589 WriteAudio: buffer underrun
> 2007-06-26 21:24:53.646 NVP: prebuffering pause
> 2007-06-26 21:24:54.031 WriteAudio: buffer underrun
> 2007-06-26 21:24:54.051 WriteAudio: buffer underrun
> 2007-06-26 21:24:54.094 NVP: prebuffering pause
> 2007-06-26 21:25:01.213 TV: Attempting to change from
> WatchingPreRecorded to None
>
> Prior to the upgrade, I didn't have any prebuffering pauses or buffer
> underruns (at least not since way back in the .17 days).  Any ideas?
>
> Thanks!
> Matt
>

I should also mention, that CPU utilization for myth averages 1%
during playback (SD) and when I see these buffer underrun/prebuffer
pause it only goes up to 5%.  The overall utilization is fairly idle.

I also tried the agressive sound card buffering option and it didn't
make a difference on or off - previously, it had been off.

Thanks!
Matt