[mythtv-users] Performance issue on 0.24-fixes - Playback stalls when a recording starts/ends

[Martin Andersen]

Hi list

I've just upgraded from 0.23 to 0.24-fixes, but I'm having problems with
playback which I didn't have on 0.23. Playback often pauses for a second or
two - apparently when a recording start or stop.

I have a fairly capable Core i5 as a backend and a ION-based frontend on a
gigabit network. The backend log doesn't give any errors and the frontend
gives me:
2011-03-16 17:06:03.446 VDPAU: Added 2 output surfaces (total 4, max 4)
2011-03-16 17:30:01.611 ALSA, Error: WriteAudio: buffer underrun
2011-03-16 17:30:01.881 Player(1): Waited 100ms for video buffers
AAAAAAAAAAAAAaALL
2011-03-16 17:30:01.887 Player(1): Waited 100ms for video buffers
AAAAAAAAAAAAAaALL
2011-03-16 17:30:01.898 Player(1): Waited 100ms for video buffers
AAAAAAAAAAAAAaALL
2011-03-16 17:30:01.903 Player(1): Waited 100ms for video buffers
AAAAAAAAAAAAAaALL
2011-03-16 17:30:02.008 Player(1): Waited 100ms for video buffers
AAAAAAAAAAAAAaALL
2011-03-16 17:30:02.024 Player(1): Waited 100ms for video buffers
AAAAAAAAAAAAAaALL
2011-03-16 17:30:02.666 RingBuf(myth://
192.168.1.10:6543/1000_20110316173000.mpg) Warning: Not starting read ahead
thread, already running
2011-03-16 17:30:02.694 Player(1): Forcing decode extra audio option on
(Video method requires it).
2011-03-16 17:30:02.775 AFD Warning: ScanATSCCaptionStreams() called with no
PMT
2011-03-16 17:30:02.775 AFD: Opened codec 0x7fee30e62c30, id(MPEG2VIDEO)
type(Video)
2011-03-16 17:30:02.775 AFD: codec MP2 has 2 channels
2011-03-16 17:30:02.775 AFD: Opened codec 0x7fee3009def0, id(MP2)
type(Audio)
2011-03-16 17:30:02.799 AFD: Resetting byte context eof (livetv 1 was eof 0)
2011-03-16 17:30:02.889 [mpegvideo_vdpau @ 0x7fee57f515a0]warning: first
frame is no keyframe
2011-03-16 17:30:03.032 [mpegvideo_vdpau @ 0x7fee57f515a0]warning: first
frame is no keyframe

MythTV Version   : v0.24-211-g785ea1b
MythTV Branch    : fixes/0.24
Network Protocol : 63
Library API      : 0.24.20101129-1
QT Version       : 4.6.2

I've tried to search the list, and it seems like quite a few users are
affected by the issue:
http://www.gossamer-threads.com/lists/mythtv/users/474214#474214

Does a bug report exist or has anyone identified/fixed the issue?

Does anyone know if the issue is the same in trunk?

Thanks
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