[mythtv-users] A/V sync 80-100mS off - HDTV

[Steve Skarda]

Is it typical to have varying audio sync on HDTV?   Roughly 50% of the shows
I record are sync'd correctly.   Another 40% typically have the video
80-100mS ahead of the audio.  Ten percent of the time, the audio is up to
800ms off.   I have to adjust the audio manually from the menu during
playback but that has to be reset after every fast forward or commercial
skip so it is pretty annoying.

Tried these configurtations:
Alsa:spdif, Alsa:default, or /dev/dsp
AC3 passthrough on or off
Use video as timebase on or off

Base system:
MythTv from SVN from couple of days ago
Pentium 3.2 w/ht, plenty of cpu available
Fusion Gold 5 HDTV cards
Ubuntu
Vanilla Kernel 2.6.15
Using realtime priority.

Here is a copy of my log when switching to watching TV.  Nothing seems to
jump out as a problem but hopefully someone that knows more about mythtv
than I do, can pick some clues out of it.

2006-02-26 17:25:27.710 Checking to see if there's a new livetv program to
switch to..
0: start_time: 5859.060 duration: -9223372036854.775
stream: start_time: 65100.668 duration: -9223372036854.775 bitrate=0 kb/s
2006-02-26 17:25:27.863 AFD: Opened codec 0x83960b0, id(MPEG2VIDEO)
type(Video)
2006-02-26 17:25:27.863 NVP: Disabling Audio, params(-1,-1,-1)
2006-02-26 17:25:27.863 NVP: Disabling Audio, params(0,-1,-1)
X Error: BadMatch (invalid parameter attributes) 8
  Major opcode:  140
  Minor opcode:  14
  Resource id:  0x1bd
2006-02-26 17:25:28.193 VideoOutputXv Error: Couldn't get the color key
color,
                        probably due to a driver bug or limitation.
                        You might not get any video, but we'll try anyway.
2006-02-26 17:25:30.318 TV: Changing from None to WatchingLiveTV
2006-02-26 17:25:30.320 New DB connection, total: 3
2006-02-26 17:25:30.320 Using realtime priority.
2006-02-26 17:25:30.320 Connected to database 'mythconverg' at host:
localhost
2006-02-26 17:25:30.541 Video timing method: SGI OpenGL
0: start_time: 5660.397 duration: 0.604
1: start_time: 5660.349 duration: 0.596
stream: start_time: 62892.770 duration: 7.233 bitrate=13142 kb/s
2006-02-26 17:25:32.794 AFD: Opened codec 0xb3870880, id(MPEG2VIDEO)
type(Video)2006-02-26 17:25:32.794 AFD: Opened codec 0xb386a970, id(AC3)
type(Audio)
2006-02-26 17:25:32.796 Opening audio device 'spdif'.
2006-02-26 17:25:32.891 NVP: Enabling Audio
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