Re: Chapter marks not where specified.

Lawrence,
> 
> >> But perhaps there is a rounding error involved? E.g. if you’re
> >> working with NTSC video, the frame rate is 29.97, not 30 fps.
> > 
> > I also mentioned it's a PAL-DVD  :-)
> 
> OK, can you give us some example I-frame times?

Here is a list of the specified and actual (as reported by dvdauthor) times of 
each chapter mark.  Unless otherwise stated, the actual is one I-frame earlier 
than specified.

Specified  Actual
 316.08    316.00
 602.44    602.32
 920.96    920.84
1149.32   1149.00 This five I-frames early!
1589.32   1589.08
1832.04   1831.92
2145.96   2145.60
2457.88   2457.84
2737.36   2737.56 one I-frame late.
3055.60   3055.36
3369.12   3369.12
3599.12   3359.04
3968.80   3968.52
4321.44   4321.24
4719.24   4719.04
4961.88   4961.56
5246.80   5246.80 Correct
5412.20   5412.20 Correct
5710.36   5710.32
5987.20   5987.20 Correct
6335.68   6335.28
6585.68   6585.60
6879.92   6879.88
7192.08   7192.08 Correct
7482.48   7482.24
7780.28   7780.12
8100.60   8100.56
8365.52   8365.20
8708.12   8707.76
9031.28   9031.08
9302.20   9301.96
9601.80   9601.68
9873.84   9873.84 Correct

All of those times are I-frame timestamps according to avidemux.

> 
> Another thing you can do is dump out the source video with mpeg2desc to
> see whether the pts values seem to correspond to what you expect.

I tried mpeg2desc, but I couldn't see anything in the output that 
distinguished I-frames from P.

What I do have is the index file generated by avidemux (from the mpeg file 
being fed to dvdauthor), and that has the data you want: total frame number, 
timestamp (as hh:mm:ss,frame) followed by the gop structure.  It's a very big 
file, far too big to post here.  I can split out all or some of the 
interesting points, including a gop or two each side, but it's still quite 
big.  Then there's the xml file I fed into dvdauthor. And the output from 
dvdauthor which lists all the chapter marks.  I'll ask this with as straight a 
face as I can muster: how much data would you like and what would you like me 
to do with it?

Tom Brock.

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