DVD Ripper Improper chapter time-stamping

[Sodbuster]

I’ve noticed an issue with chapters “ChapterTimeStart” not being accurately encoded into MKV files ripped using DVDFab’s DVD Ripper. This has happened with multiple (music) DVDs with 29.97003 fps frame rates. Below is an example of what’s happening… the first list is the actual Chapter Start Times by chapter (and matches VLC when playing the DVD itself) while the second list is what DVDFab encodes.

Ch Actual Chapter Start Times DVDFab Chapter Start Times
1 <ChapterTimeStart>00:00:00.000000000</ChapterTimeStart> <ChapterTimeStart>00:00:00.000000000</ChapterTimeStart>
2 <ChapterTimeStart>00:03:59.005433333</ChapterTimeStart> <ChapterTimeStart>00:03:58.766000000</ChapterTimeStart>
3 <ChapterTimeStart>00:07:38.057600000</ChapterTimeStart> <ChapterTimeStart>00:07:37.599000000</ChapterTimeStart>
4 <ChapterTimeStart>00:12:26.946200000</ChapterTimeStart> <ChapterTimeStart>00:12:26.199000000</ChapterTimeStart>
5 <ChapterTimeStart>00:16:23.782800000</ChapterTimeStart> <ChapterTimeStart>00:16:22.799000000</ChapterTimeStart>
6 <ChapterTimeStart>00:18:50.829700000</ChapterTimeStart> <ChapterTimeStart>00:18:49.699000000</ChapterTimeStart>
7 <ChapterTimeStart>00:22:02.120800000</ChapterTimeStart> <ChapterTimeStart>00:22:00.799000000</ChapterTimeStart>
8 <ChapterTimeStart>00:24:56.928766666</ChapterTimeStart> <ChapterTimeStart>00:24:55.432000000</ChapterTimeStart>
9 <ChapterTimeStart>00:30:14.445966666</ChapterTimeStart> <ChapterTimeStart>00:30:12.632000000</ChapterTimeStart>
10 <ChapterTimeStart>00:34:32.537133333</ChapterTimeStart> <ChapterTimeStart>00:34:30.465000000</ChapterTimeStart>
11 <ChapterTimeStart>00:40:16.947866666</ChapterTimeStart> <ChapterTimeStart>00:40:14.531000000</ChapterTimeStart>
12 <ChapterTimeStart>00:45:01.498800000</ChapterTimeStart> <ChapterTimeStart>00:44:58.797000000</ChapterTimeStart>
13 <ChapterTimeStart>00:48:24.935366666</ChapterTimeStart> <ChapterTimeStart>00:48:22.030000000</ChapterTimeStart>
14 <ChapterTimeStart>00:55:29.159166666</ChapterTimeStart> <ChapterTimeStart>00:55:25.830000000</ChapterTimeStart>
15 <ChapterTimeStart>00:59:06.476266666</ChapterTimeStart> <ChapterTimeStart>00:59:02.930000000</ChapterTimeStart>
16 <ChapterTimeStart>01:02:35.551800000</ChapterTimeStart> <ChapterTimeStart>01:02:31.796000000</ChapterTimeStart>
17 <ChapterTimeStart>01:06:19.809166666</ChapterTimeStart> <ChapterTimeStart>01:06:15.829000000</ChapterTimeStart>

Any idea what’s causing this? I suspect a software bug and not some setting within DVDFab, but welcome any assistance. It sort of looks like DVDFab is using a 29.94 fps frame rate instead of the true frame rate to specify the frame corresponding to the chapter start. At the start of the file there’s just a quarter second shift at the second chapter, but the final chapter is shifted by ~4 seconds. This is a big deal for music DVDs where I want to start precisely at the beginning of the chapter/song (and not catch the last few moments of the previous song).

[Mona]

We will try to duplicate it. At the same time, please provide the dvdfab_internal log file for one of the conversions for analyzing, thanks.

[Sodbuster]

Attached intern log... not the exact same example from above, but I confirmed the issue also occurred here (the final chapter is off by ~3.8 seconds at 1 hour 12 min 50 sec into the DVD track). I had to post as a zip because the raw text file was just over the 2 MB limit.

[signals]

Sodbuster, please flush your internal log file (delete it). DVDFab will create a new one the next time you start it. You can also cut and paste the log session you need into a new text document using Notepad.

[Sodbuster]

I cut and paste the session into the .txt file below. This session uses the same ISO file that I uploaded for analysis to create the MKV file.

[signals]

Thanks, the service team will check it for you, as noted in post #2 above.