[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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