Big Trouble synching in AC3 5.1...please help...

[cyberafv]

Recently i ripped a movie in DivX 5.02
Pro and AC3 (5 channels, 448 Kbps) audio.
The software i used was:
Xmpeg 4.3 (just for video stream)
DVD Decrypter 3.0
DVD2AVI (just for AC3 extraction)
Nandub

Interleaving settings i used:
"Preload" and "Interleave" to 128 ms.

But the audio stream taken from first VOB goes out of synch when muxing with video (at least 2 seconds) even when the delay is zero ms!...is that normal?

I got to use Skew correction=200 ms in Nandub, and even when it seems
in synch that AVI now, i'm beginning
to question all these AC3-Sound ripping methods that i know.
The rest of VOB files seem to be OK when muxing. My only big problem is VOB #1. I never found this issue when
muxing 2-channels (192 Kbits/sec) AC3 audio streams...what am i doing wrong?

[UncasMS]

- first of all 200ms are not 2 seconds delay but 0.2 seconds

- is there a logo/intro in the beginning of the movie like warnerbro?

[Joseph]

Mayby is better to compress the video with DVD2AVI too. In the AC3 file name, made by DVD2AVI you will find the preload in ms (mayby -80ms). For example 01 AC3 T01 3_2ch 448Kbps DELAY -80ms.ac3. The interleave of 128ms is good!

[cyberafv]

A little misunderstanding here...

Uncasm...I know 200 ms is not 2 seconds, but
the skew correction of 200 ms was the only value
that I found in Nandub to fix that bad synching.
It got nothing to do with the 2 seconds of my
AVI file. And in response to question #2: No, there
isn't a logo/intro in the beginning of the movie like warnerbro.

Joseph...Thanks for your suggestion. I never tried
before DVD2AVI for making video extractions,
because Xmpeg is more reliable is that area for me,
but is a good idea anyway...

[UncasMS]

I know 200 ms is not 2 seconds

ok, i wanted to make sure ....

have you checked if video and ac3 have the same running time in minutes:seconds?

if an ac3 codec is installed, most player will be able to play the ac3 file - on my machines bsplayer, wmp64 or zoomplayer do.

[The Maynard]

The last couple of movies I've converted, even the the delay is noted on the ac3 file it was still out of synch. So I set the interleaving to 120ms and the delay to 200 and it worked on all of them. Hope this helps.

[cyberafv]

Uncasm...I made an unexpected discovery: the AC3 audio stream is indeed shorter than the video stream.
Audio time is 25:09 and Video time is 25:10...is that normal?


Even so, i can't understand why i finally found 200 ms like a correct value to synch that AVI using skew correction.
I read somewhere on the net that DVD2AVI has a bug in its audio decoder and with some DVDs this software can drop 2 frames behind(which explains the A/V displacement) from the first VOB during AC3 extraction, generating a delay=80 ms.

Maynard...Thanks for your tips. I have never changed before
the "standard interleaving settings" for AC3 muxing. My AVI
worked fine using interleaving to 128 ms and (by coincidence) skew correction=200 ms...by the way...have you used DVD2AVI for AC3 extraction too?

[The Maynard]

That's all I use for audio extraction. Works very well because it give you the MS delay in the file name. So it's very usefull.