[mythtv-users] Dvico FusionHDTV5 Gold Plus - A/V sync

[Steve Skarda]

If you have this card, can you tell me if you have any issues with A/V sync
on OTA, ATSC HDTV programs?

I have had an ongoing issue with audio 200-300mS behind video on most HDTV
shows.   I have considered several sources of the problem (kernel, playback,
Alsa) but have come to the conclusion that it must be in the recording.   I
could very well be wrong but I think it is the tuner card because the
problem is consistently worse on some channels (PBS).   If it were a kernel
latency, Alsa, or Myth sync issue, I would expect the problem to show up
more consistently across channels, programs, and formats.  Not to metion,
this doesn't
seem to be a widespread problem and the Dvico Fusion card does not seem to
be that common.

Any guidance on how to troubleshoot this issue or comparative experience
with this card would be greatly appreciated.

List of troubleshooting steps I've tried with no impact on the problem:
-Reload Alsa from cvs
-mythfrontend -v audio (nothing unusual)
-spdif, analog, alsa, no alsa, passthrough, no passthrough.
-standard kernel, prememptive kernel
-realtime priority, rtlimits, run as root
-Myth 0.18, 0.19, svn
-Ubuntu Breezy, Ubuntu Dapper

Info on my system:
Two Dvico FusionHDTV5 cards (considering getting third HD3000 just to
compare)
Intel Motherboard with on-board sound
Latest Ubuntu Dapper kernel

Other potential:
-I read somewhere that a weak signal can create a/v sync issues.  95% of
shows record OK with no obivous problems or bad fragments listed in the log
but I will occasional miss a show due to weak signal/weather or see bad
fragments show up in log.   Any experience or knowledge to confirm that as a
possiblity?

One last item:
As long as I have the attention of Dvico owners, can you tell me if you
typically see this show up in your syslog?  I don't think it is a problem
but am surprised that I have it logging in the system log.

May  3 08:00:02 localhost kernel: [4513310.340000] cx88[0]/2: queue is empty
- first active
May  3 08:00:02 localhost kernel: [4513310.340000] cx88[0]/2:
cx8802_start_dma w: 0, h: 0, f: 2
May  3 08:00:02 localhost kernel: [4513310.340000] cx88[0]/2: setting the
interrupt mask
May  3 08:00:02 localhost kernel: [4513310.340000] cx88[0]/2: [d8fd2a80/0]
cx8802_buf_queue - first active
May  3 08:00:03 localhost kernel: [4513311.061000] cx88[0]/2:
cx8802_restart_queue
May  3 08:00:03 localhost kernel: [4513311.061000] cx88[0]/2:
cx8802_restart_queue: queue is empty
May  3 08:00:03 localhost kernel: [4513311.063000] cx88[0]/2: queue is empty
- first active
May  3 08:00:03 localhost kernel: [4513311.063000] cx88[0]/2:
cx8802_start_dma w: 0, h: 0, f: 2
May  3 08:00:03 localhost kernel: [4513311.063000] cx88[0]/2: setting the
interrupt mask
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