mythtv at cvs
Sep 4, 2010, 7:00 PM
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Ticket #8864: mythtranscode corrupting recordings when transcoding to MPEG4
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#8864: mythtranscode corrupting recordings when transcoding to MPEG4
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Reporter: nate <svndotmythtvdotorg1@…> | Type: defect
Status: new | Priority: major
Milestone: unknown | Component: MythTV - Mythtranscode
Version: Unspecified | Severity: medium
Keywords: | Ticket locked: 0
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Have seen this behavior for about a week now. Currently at r26104 on the
trunk.
When running mythtranscode on a HD recording using the "Low Quality"
profile and MPEG4, I have had a number of corrupted recordings. The
output file sizes are approximately 1/3 of their normal size for typical
recordings. The audio appears fine, however all but a few sporadic frames
of video are gone/corrupted.
Note: Some of these recordings may have been tagged for transcoding twice,
i.e. mythtranscode has been run on them twice with the same settings.
When picking shows for transcode, I sometimes accidentally re-transcode
recordings, however this has never caused any issues in the past and
typically results in an innocuous no-op. So this behavior might be
specific to transcoding twice, I cannot tell for sure.
Perhaps an option allowing myth to skip transcoding shows that have
already been transcoded could be added (will check the tickets if a
request for this has already been made)
When playing one of the corrupted recordings, the frontend streams this
output to the console:
{{{
[mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left
7FE828, score= -3)
[mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors
[mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left
7FBFA7, score= -3)
[mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors
[mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left
7F9267, score= -3)
[mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors
2010-09-04 21:47:20.850 OSD: Base theme size: 1280x720
2010-09-04 21:47:20.850 OSD: Scaling factors: 0.85625x0.972222
[mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left
7F2829, score= -3)
[mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors
[mpeg4 @ 0x70425c0] slice end not reached but screenspace end (72 left
7F2187, score= -3)
[mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors
2010-09-04 21:47:20.866 OSD: Base theme size: 1280x720
2010-09-04 21:47:20.866 OSD: Scaling factors: 0.85625x0.972222
[mpeg4 @ 0x70425c0] slice end not reached but screenspace end (66 left
6E0072, score= -3)
[mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors
}}}
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Ticket URL: <http://svn.mythtv.org/trac/ticket/8864>
MythTV <http://www.mythtv.org/>
MythTV
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