[mythtv-users] MGM HD recordings play back inconsistently

Steven Adeff adeffs.mythtv at gmail.com
Sun Dec 21 20:10:30 UTC 2008


On Fri, Dec 19, 2008 at 4:30 PM, Yeechang Lee <ylee at pobox.com> wrote:
> A few months ago my local cable provider (which I record from via
> FireWire) added MGM HD to its lineup. Since I love movies, this is a
> big boon.
>
> Two recent recordings exhibit strange behavior on some, but not all,
> playbacks. For example, half the time when I play these movies, I see
> the likes of the following from mythfrontend:
>
> 2008-12-19 13:03:57.335 Audio 37676978 ms behind video but already 75
> video frames queued. AV-Sync might be broken.
> 2008-12-19 13:03:57.347 Audio 37677011 ms behind video but already 75
> video frames queued. AV-Sync might be broken.
> 2008-12-19 13:03:57.379 NVP: Video is 30 frames behind audio (too
> slow), dropping frame to catch up.
> 2008-12-19 13:03:57.381 NVP: Video is 30 frames behind audio (too
> slow), dropping frame to catch up.
> 2008-12-19 13:03:57.387 Audio 37677012 ms behind video but already 75
> video frames queued. AV-Sync might be broken.
> 2008-12-19 13:03:57.397 Audio 37677046 ms behind video but already 75
> video frames queued. AV-Sync might be broken.
> 2008-12-19 13:03:57.410 Audio 37677047 ms behind video but already 75
> video frames queued. AV-Sync might be broken.
>
> As the log messages indicate, audio is unsynchronized with video,
> which stutters. The other half the time, though, playback of said
> recording is fine.
>
> Rebuilding the seektable
> (<URL:http://www.gossamer-threads.com/lists/mythtv/users/236245#236245>)
> doesn't help, but doing a lossless transcode did fix the issue on one
> of the recordings; I've kept the other untouched as a control sample.
>
> I have not seen this issue on other MGM HD recordings. The two
> recordings are old movies from the 1940s and 1950s; however, other
> vintage MGM HD recordings do not exhibit the issue.

have you checked the file for missing frames? this seems to happen to
me when firewire glitches and frames get lost, but it's never been bad
enough for me that it doesn't get caughtup almost right away.

one more reason to get an HDPVR once 0.22 is released! (well, at least
for me ;-)

-- 
Steve
http://www.jobs-khakis-chicks.com/MythTV/
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