Audio pts moves backwards... and what does this mean?

Elio Blanca <[email protected]>
Newsgroups gmane.comp.multimedia.dvdauthor.user
Message-ID <[email protected]>
I'm about to author a dvd and while dvdauthor scans input mpeg2 files (these early runs are with 
`dvdauthor -n -x mystructure.xml') some warnings are printed:

STAT: Processing ep3_4.m2v...
WARN: Audio pts for channel 32 moves backwards by 108; please remultiplex input.
WARN: Previous sector: 6.770 - 10.661
WARN: Current sector: 10.660 - 10.660
WARN: Audio pts for channel 32 moves backwards by 180; please remultiplex input.
WARN: Previous sector: 175.470 - 178.542
WARN: Current sector: 178.540 - 178.540
WARN: Audio pts for channel 32 moves backwards by 164; please remultiplex input.
WARN: Previous sector: 224.950 - 226.781
WARN: Current sector: 226.780 - 226.780
WARN: Audio pts for channel 32 moves backwards by 416; please remultiplex input.
WARN: Previous sector: 465.290 - 469.374
WARN: Current sector: 469.370 - 469.370
STAT: VOBU 3582 at 1481MB, 13 PGCs
INFO: Video pts = 0.160 .. 680.000
INFO: Audio[0] pts = 0.160 .. 679.840
INFO: Audio[32] pts = 6.770 .. 588.810
INFO: Audio[33] pts = 6.920 .. 589.075

This appears several times in just a single file, have I to worry about?
Anyway, I would like to fix them. Now, I re-multiplexed this clip several times 
(video+audio+sub0+sub1) and nothing changes. If I provide dvdauthor with the same clip without track 
32 (first subtitle stream) the messages don't appear.
Channel 32 refers for sure to a subtitle track, so I'm going to assume timings are involved with 
this: are timings not good? do subtitles overlap? (I already checked them and it appears this is not 
the case) Do dvdauthor require more "pause" time between one and another?
What does "moves backwards" mean?



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