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

[Steve Skarda]

On 2/26/06, Steve Skarda <steveskarda at gmail.com> wrote:
>
> 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
>
>
Does any one else had this problem and been able to resolve it?   I have
made no progress on tracking this one down.
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