ripped eng and ger audio different length = asynchron video!

[Chetwood]

Weirder and weirder. I'm still working on some of my own Angel PAL DVDs and I've tried both Smartripper and DVD Decrypter to demux the audio streams which results in these files:

english audio: 61.253.376 byte
german audio: 61.175.808 byte

When playing them in Maestro I get about 3 secs difference so that when watching the movie with german sound the audio is a few secs before the video! How come? I mean, of course the german audio has different breaks and other words but still it should be of the same length so that both intro and outtro of an episode display with the video.

This weird occurence goes for all of the 4 eps on the DVD (all my Buffy rips were fine). When I watch from my original DVD - either in PowerDVD or on my standalone - both display the DVD correctly.

What gives?

[RB]

DVDDecrypter should have created a stream information text file. What does it say about the audio delay?

[mpucoder]

Looks like you were lucky in the past. DVDs are not like AVIs, the sound does not need to start at the same time as the video. The "audio delay" can help you with this, but also preserving the timecodes in video, audio, and subpicture streams is important.

[Chetwood]

Originally posted by RB
DVDDecrypter should have created a stream information text file. What does it say about the audio delay?

0x80 - Audio - AC3 / 2ch / 48kHz / DRC / English / LBA: 3075 / PTS: 00:00:00.053 / Delay: -80ms
0x81 - Audio - AC3 / 2ch / 48kHz / DRC / Deutsch / LBA: 3137 / PTS: 00:00:01.851 / Delay: 1717ms

So what can I do?

[RB]

You need to correct the audio delay, obviously. The original delay gets lost when you reauthor in Maestro. Follow the guide at http://www.encodinginfo.org.uk/guides/ac3delay.php . If you can live with the audio being a few (mostly not noticable) milliseconds off, it's enough to run the audio streams through AC3 Delay Corrector (http://home.t-online.de/home/520072193568-0001/) and reauthor.

[RB]

Originally posted by mpucoder
The "audio delay" can help you with this, but also preserving the timecodes in video, audio, and subpicture streams is important.
In my experience, even with preserving the original video timecode when encoding in CCE, the original audio delay gets lost upon authoring with the demuxed AC3 in Maestro. Only when using an untouched, demuxed M2V I could retain the original delay... well sort of. Thing is, Maestro rounds the delay to the next full video frame duration in this case, so for PAL if the original audio delay is -112 ms, I would end up with -120 ms after authoring.

[Chetwood]

Originally posted by RB
You need to correct the audio delay, obviously. The original delay gets lost when you reauthor in Maestro.

Damn! And I was thinking that when I demuxed stuff from the original DVD I thought I'd get everything in the format I need!

@RB

I'm authoring ep DVDs which come up with slight over 5 GB. Instead of reencoding in CCE I simply let DVD2ONE run over it and 'compress' it by 10%...