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

On Fri, 02 Sep 2011 10:21:58 +0200, Elio Blanca wrote:

> 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.

There is a bug in that it’s saying it’s to do with “audio” when in fact
it’s a subpicture stream in this case.

But what it’s checking for does seem to be legitimate, namely that the
packet timestamps are monotonically increasing. Otherwise how is
playback supposed to work?

Having said that, the actual amounts of overlap seem minor—on the order
of milliseconds. I assume this is some kind of rounding error from
computing the subtitle durations.

What do the relevant parts of your subtitle file (around those
overlapping times) look like?

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