[mythtv-commits] Ticket #10129: Lossless Transcode Corrupting Recordings

[MythTV]

#10129: Lossless Transcode Corrupting Recordings
-------------------------------------+-------------------------------------
 Reporter:  Scott Harris             |           Type:  Bug Report -
  <snharris99@…>                     |  General
   Status:  new                      |       Priority:  minor
Milestone:  unknown                  |      Component:  MythTV -
  Version:  0.24.1                   |  Mythtranscode
 Keywords:                           |       Severity:  high
                                     |  Ticket locked:  0
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 I have had 3 or 4 occasions over the last 2-3 weeks where a lossless
 tanscode after creating a commercial cutlist has rendered the recordings
 entirely unusable.

 - Transcode runs for 3 - 4 hours instead of the usual 20 - 30 minutes.
 - Size is 5x normal, where the resulting file would normally be about 4GB,
 it's 20GB on the corrupted file.
 - Reported time is 2x normal where the resulting file would normally be
 about 40 mins, it reports as 1:20 on the corrupted file.
 - Audio is missing.
 - Video is extremely interlaced and pixelated.

 The backend logs show (taken from the last recording to be corrupted)....

 2011-10-25 06:46:16.171 Warning: partial frame found!

 2011-10-25 06:46:16.188 #0 PTS:03:51:04.030 Delta: 0.0ms queue: 1

 2011-10-25 06:46:16.490 Inserting 1 I-Frames after #2

 2011-10-25 06:46:16.585 WARNING - Unsupported FPS change from 59.96 to
 29.97

 2011-10-25 06:46:16.973 Inserting 1 I-Frames after #14

 2011-10-25 06:46:16.983 WARNING - Unsupported FPS change from 59.96 to
 29.97

 2011-10-25 06:46:17.086 Inserting 2 I-Frames after #2

 QString::arg: Argument missing: "Frame 9 > 8. Corruption likely at pos: 8"
 , 2915128

 2011-10-25 06:46:17.126 Frame 9 > 8. Corruption likely at pos: 8

 2011-10-25 06:46:17.188 Inserting 2 I-Frames after #8

 2011-10-25 06:46:17.391 Inserting 2 I-Frames after #14

 QString::arg: Argument missing: "Frame 21 > 20. Corruption likely at pos:
 20" , 3260296

 2011-10-25 06:46:17.434 Frame 21 > 20. Corruption likely at pos: 20

 2011-10-25 06:46:17.499 Inserting 2 I-Frames after #20

 2011-10-25 06:46:17.834 Inserting 2 I-Frames after #26

 With the last 2 messages (9>8 and 21>20) just being repeated over and over
 again with only the ", 3260296" part changing.

 The original recordings seemed fine.  However, perhaps if the file had
 that many issues, that perhaps that transcode should fail instead of
 ruining the recording?

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Ticket URL: <http://code.mythtv.org/trac/ticket/10129>
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