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View Full Version : audio offset - how to correct easiest? (usual suspects)


halcyon
27th February 2002, 23:10
I started ripping DVDs just a few weeks ago, and the forums have helped a lot, but I'm still a newbie, so bear with me. I've been searching and researching for a while now looking for a solution to my problem, and it looks like pool had the same one : http://forum.doom9.org/showthread.php?s=&threadid=15567 . I've found a lot of good info, but I wanted to put it all together to apply it to my case.
The problem is the audio sync on the widescreen rip of the Usual Suspects NTSC DVD using DVD2SVCD. I believe what pool did is set the extra audio offset for bbMPEG then restart using crash recovery to the muxing step, but because the mpgs are already split for two CDs by that point (I think), bbMPEG put the audio offset onto each disc (?). What I've done so far is join the muxed mpgs left behind by DVD2SVCD so that I don't get that 8.5 sec audio delay in the second disc (hopefully) like pool did. If I get the audio sync'd up again for the entire mpg (by demuxing, adding silence to audio then remuxing), can I have DVD2SVCD finish it so I don't have to do the chapters and images manually?
Or, since getting it done quickly doesn't matter that much (I just want to do as little manually as possible), would it be possible to just start over from the vobs and set an 8.5 sec audio offset for bbMPEG? I may be a little mixed up here because I'm at work and don't have access to DVD2SVCD to check facts. Thanks!

-=<halcyon>=-

markrb
27th February 2002, 23:31
No you have the way it works wrong.
BBmpeg takes the mpv file and the mp2 file and merges them into a mpg file. After that it then cuts them into the sizes needed. The audio offset is put in during the first stage of BBmpeg.
So if you have an offset of 2 seconds it adds silence for 2 seconds and then adds the mp2 audio stream or something along those lines. This way the whole audio is delayed by 2 seconds.

I know when changing the file size to cut at you need to edit the d2s file because DVD2SVCD does not pass the new information on when using crash recovery. You may have to do something like this for the audio offset as well, but I am not sure.

Mark

halcyon
28th February 2002, 00:43
Perfect. So I should be able to set the audio offset and just crash recover to the mux step, right?

-=<halcyon>=-

markrb
28th February 2002, 05:57
That might work, but I am not completely sure.
When I need to change the file size I need to edit the .d2s file with a text editor like notepad, because the new info on size is not passed to BBmpeg when using crash recovery.
I think you have to do the same thing with the offset, but I have never tried it and I do not know what sections need to be changed.

Mark