Re: Chapter marks not where specified.

Hi Lawrence,

> 
> > 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?
> 
> I have downloaded hundreds of megabytes in times past, just to check
> out a bug, so I’m game to do it again, if I can get it from somewhere
> without jumping through too many hoops. Whatever you think is
> sufficient to demonstrate the problem.
> 
> One option I’ve thought of, but never tried, is doing a point-to-point
> torrent: you create a .torrent file at your end, e-mail it to me while
> you start seeding with a BitTorrent client at your end, and I download
> it with a BitTorrent client at my end, and once I’ve got it all, I let
> you know, and you can stop your BitTorrent client seeding.

Sounds like a piece of cake.  I've never used a torrent in my entire puff, but 
I'll see what it takes.

In the mean time, I've been trying to reproduce the problem with a shorter 
clip, and I've managed just that, plus a bit extra.  I ran chaplin on a DVD I 
created with dvdauthor 4 years ago: the very first chapter mark in the first 
title is not as specified (295.12 s when 295.2 s was specified).  If I 
remember correctly, ffmpeg didn't have the '-force_key_frames' option in those 
days.

That was interesting enough.  I then ripped the DVD just mentioned, pulled the 
first vob file into avidemux and checked that the chapter marks specified in 
the xml file (I never throw anything away) really are I-frames.  I also 
noticed that the the frame at 295.12 s is *not* an I-frame.  That was a bit of 
a surprise.

I then downloaded and build the latest source (d2701dc); got avidemux to make 
a copy of the first title on the DVD as a single mpeg; ran that through 
dvdauthor and noted where (it said) it put the chapter marks. The very first 
(non-zero) mark was in exactly the same wrong place as four years ago.  
However...

I noticed that dvdauthor had warned of having no default video format defined, 
and appears to have ignored the xml file in this regard, and only in this 
regard, if you discount the occasional wrongly placed chapter mark.

tomb@debian8:~/avidemux_projects/test_2012_03_30$ ./make_dvd.sh
DVDAuthor::dvdauthor, version 0.7.0+.
Build options: gnugetopt iconv freetype fontconfig
Send bug reports to <dvdauthor-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>

INFO: no default video format, must explicitly specify NTSC or PAL
INFO: dvdauthor creating VTS
STAT: Picking VTS 01

STAT: Processing /home/tomb/avidemux_projects/test_2012_03_30/episode_1.mpeg...
STAT: VOBU 6048 at 1226MB, 1 PGCs
INFO: Video pts = 0.184 .. 2902.984
INFO: Audio[0] pts = 0.184 .. 2903.128
STAT: VOBU 6048 at 1226MB, 1 PGCs
CHAPTERS: VTS[1/1] 0.000
CHAPTERS: VTS[1/1] 295.120
CHAPTERS: VTS[1/1] 558.640
CHAPTERS: VTS[1/1] 860.560
CHAPTERS: VTS[1/1] 1196.080
CHAPTERS: VTS[1/1] 1513.840
CHAPTERS: VTS[1/1] 1798.000
CHAPTERS: VTS[1/1] 2151.280
CHAPTERS: VTS[1/1] 2399.920
CHAPTERS: VTS[1/1] 2694.160
INFO: Generating VTS with the following video attributes:
INFO: MPEG version: mpeg2
INFO: TV standard: pal
INFO: Aspect ratio: 4:3
INFO: Resolution: 720x576
INFO: Audio ch 0 format: ac3/2ch,  48khz drc

STAT: fixed 6048 VOBUs                         
INFO: dvdauthor creating table of contents
INFO: Scanning dvd/VIDEO_TS/VTS_01_0.IFO
ERR:  no video format specified for VMGM
tomb@debian8:~/avidemux_projects/test_2012_03_30$

The xml file in question is as follows:- 

<dvdauthor dest="dvd">
<vmgm />
<titleset>
<titles>
<video format="pal" aspect="4:3" />
<pgc>
<pre> jump chapter 1; </pre>
<vob
file='/home/tomb/avidemux_projects/test_2012_03_30/episode_1.mpeg'
chapters="00:00.00,04:55.20,09:18.72,14:20.64,19:56.16,25:13.92,29:58.08,35:51.
36,40:00.00,44:54.24"
/>
</pgc>
</titles>
</titleset>
</dvdauthor>

This problem *did not* occur with the 33-chapter single-title DVD which was 
the subject of my original post.  The only differences between the two xml 
files are the aspect ratio, the input file pathname and the number of chapters 
(they both started life as copies of a template).  The aspect ratio specified 
in the xml *is*, in each case, evidently read and respected.  I've got around 
it, of course, by building dvdauthor with PAL as the default format.  I didn't 
try specifying the format on the command line: there's only so much time.

Tom.

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