[MEncoder-users] a-v synchronization problems of some NTSC DVDs with -oac copy

Corey Hickey bugfood-ml at fatooh.org
Wed Apr 27 02:04:21 CEST 2005

David Soukal wrote:

> If there's anything I could do to help localize the problem, let me know.

It would be nice if you could post a section of the movie on some public
server so we could try it out.

1. Pick a DVD that gives you desync problems early on.

2. Run 'mplayer dvd://1 -dumpstream'. You can ctrl-c mplayer once it's
dumped a little past where you start getting problems

3. Use the dd command to refine it further, like this:
$ dd if=stream.dump of=firstpart.dump bs=1M count=100
Adjust the count value to as small as you can while still including the
problematic part.

4. Encode firstpart.vob to make sure you still have trouble.

5. At this point firstpart.vob will still be pretty big. See if you can
remove some of the beginning, like this:
$ dd if=firstpart.dump of=small.dump bs=1M skip=50

6. Use trial and error to find the biggest skip value you can where you
still have trouble with small.dump.

7. Put the file on some http/ftp server and report the URL to us.


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