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

Elio Blanca <[email protected]>
Newsgroups gmane.comp.multimedia.dvdauthor.user
Message-ID <[email protected]>
Il 03/09/2011 03:24, Lawrence D'Oliveiro ha scritto:
> 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?

Well, based on dvdauthor output I can highlight these:


1
00:00:06,617 --> 00:00:10,501
bla

2
00:00:10,506 --> 00:00:12,995
bla

[cut]

34
00:02:55,313 --> 00:02:58,381
bla

35
00:02:58,382 --> 00:03:00,347
bla

[cut]

52
00:03:44,799 --> 00:03:46,621
bla

53
00:03:46,626 --> 00:03:49,115
bla

[cut]

102
00:07:45,139 --> 00:07:49,210
bla

103
00:07:49,215 --> 00:07:52,375
bla

In those subs timings are next but not overlapping.

Anyway, after a fast look at the spumux code, I see there are several issue with times.
* subviewer format allows for resolution 1/1000 of a second.
* subtitle_elt struct stores times with resolution 1/100 of a second.
* DVD time markers (or whatever they are called) have resolution 1/90000 of a second.
* Finally, movie frames are displayed 23.976/25 times a second.
I got confused.

I see when rounding times at 1/100 of a second, some end markers in the sample srt subs perfectly 
overlap with subsequent start markers, so may they be the root of these warnings?

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