[mythtv-users] Mytharchive DVD creation: sound loss part-way through a recording
John Pilkington
J.Pilk at tesco.net
Mon Oct 26 21:56:13 UTC 2009
I routinely archive DVB recordings to DVD. Under 0.21-fixes recently
this rarely failed, but during the past week, under 0.22 fixes, the
sound on two films has vanished part-way through the conversion. The
original recordings played well. Here are short sections of the 516KB
mythburn.log
---------------------
read 13%
read 14%
video PTS inconsistent: 0:17:15.6400 0:17:15.6400 0:17:15.7200
0:17:15.4400 diff: 0:00:00.0800
video PTS inconsistent: 0:17:15.6800 0:17:15.6800 0:17:15.7600
0:17:15.4800 diff: 0:00:00.0800
video PTS inconsistent: 0:17:15.7200 0:17:15.7200 0:17:15.8000
0:17:15.5200 diff: 0:00:00.0800
video PTS inconsistent: 0:17:15.7600 0:17:15.7600 0:17:15.8400
0:17:15.5600 diff: 0:00:00.0800
video PTS inconsistent: 0:17:15.8800 0:17:15.8800 0:17:15.6000
0:17:15.3200 diff: 0:00:00.2800
fixing audio PTS inconsistency - diff: 0:00:00.1200 - need to add 5
frame(s)
encoding an MP2 audio frame
read 15%
read 16%
read 17%
Wrong audio frame size: 968
read 18%
fixing audio PTS inconsistency - diff: 0:00:00.0240 - need to add 1
frame(s)
encoding an MP2 audio frame
read 19%
read 20%
read 21%
------------------
STAT: fixing VOBU at 391MB (1105/6456, 17%)
STAT: fixing VOBU at 396MB (1121/6456, 17%)
STAT: fixing VOBU at 400MB (1137/6456, 17%)
STAT: fixing VOBU at 404MB (1153/6456, 17%)
STAT: fixing VOBU at 409MB (1169/6456, 18%)
WARN: audio sector out of range: -8271 (vobu #1168, pts 1283.680)
WARN: audio sector out of range: -8433 (vobu #1169, pts 1284.880)
WARN: audio sector out of range: -8594 (vobu #1170, pts 1286.320)
WARN: audio sector out of range: -8767 (vobu #1171, pts 1287.520)
WARN: audio sector out of range: -8947 (vobu #1172, pts 1288.720)
WARN: audio sector out of range: -9135 (vobu #1173, pts 1289.920)
and so on to the end of the file, with a report every 5MB or so that a
VOBU has been fixed.
--------------------
The 'inconsistencies' appear to be unimportant - there are often lots
like this - and the killer in this case seems to be the wrong audio
frame size. The recording had been through one pass of mencoder and
then commercial-stripped with lossless mpeg2 mythtranscode. More
passes through mythtranscode didn't help when I tried them on the
earlier problem file.
Have there been changes to mythtranscode that might account for what
seems to be a new problem? And can anyone suggest how to detect and
remove what seems to be a single defect, in an apparently good
recording, that defeats dvdauthor?
- and no, I haven't tried it with ProjectX. I don't have it on this
box. Myth native mode archives the file OK but may not be so portable.
TIA
John P
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