[mythtv-users] Audio / Video sync problems when watching liveTV

Grégory Trélat gregory.trelat at lolitech.fr
Wed Apr 4 15:50:59 UTC 2007


Hi,

I have several problem with the audio / video sync when i watch LiveTV 
or Recorded programs.
The symptom are :

- deceleration on the video  near every five minutes
- audio and video out of sync sometime

I think these symptoms are binded.

My config information :

Gentoo with 2.6.20  kernel
1 giga of RAM
AMD Sempron 3000+
TV card Asus MyCinema P7131 hybrid ( i use only the analog part with the 
last v4l-dvb driver)
Signal format is SECAM (i'm french)
nvidia-drivers 1.0.9755-r1 with  dualhead
Xorg 7.1
mythtv-0.20_p12801
Frontend + Backend on the same system


So I start the frontend with  "-v playback > /home/debug" and i notice, 
many time in the log :



TV: StartRecorder(): took 570 ms to start recorder.
2007-04-04 12:08:45.384 detectInterlace(Ignore Scan, Interlaced Scan, 
25, 576) ->Interlaced Scan
2007-04-04 12:08:45.388 Opening ALSA audio device 'default'.
----------------------------------
Using deinterlace method kerneldeint
2007-04-04 12:08:46.138 Using realtime priority.
---------------------------------


2007-04-04 13:31:24.464 NVP: Video is 6.58475 frames ahead of audio,
            doubling video frame interval to slow down.
2007-04-04 13:31:24.466 A audio timecode 4953721
2007-04-04 13:31:24.466 A audio timecode 4953753
2007-04-04 13:31:24.547 NVP: Video is 5.65105 frames ahead of audio,
            doubling video frame interval to slow down.
2007-04-04 13:31:24.549 A audio timecode 4953785
2007-04-04 13:31:24.630 NVP: Video is 4.64453 frames ahead of audio,
            doubling video frame interval to slow down.
2007-04-04 13:31:24.632 A audio timecode 4953817
2007-04-04 13:31:24.697 NVP: Video is 3.65838 frames ahead of audio,
            doubling video frame interval to slow down.
2007-04-04 13:31:24.699 A audio timecode 4953849
2007-04-04 13:31:24.782 A audio timecode 4953881
2007-04-04 13:31:24.782 A audio timecode 4953913
2007-04-04 13:31:24.855 A audio timecode 4953945
2007-04-04 13:31:24.894 A audio timecode 4953977
2007-04-04 13:31:24.915 A audio timecode 4954010
2007-04-04 13:31:24.974 A audio timecode 4954041
2007-04-04 13:31:24.974 A audio timecode 4954073
2007-04-04 13:31:24.999 A audio timecode 4954105
2007-04-04 13:31:25.056 A audio timecode 4954137
'video_output' mean = '66960.09', std. dev. = '21013.18', fps = '14.93'
2007-04-04 13:31:25.094 A audio timecode 4954169
2007-04-04 13:31:25.115 A audio timecode 4954205

A bug in the NVplayer or NVrecorder ?
Problem with timing method ?

Am I alone with this problem ?
Someone can help me to find an issue ?

Thanks all







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