Audio synchronisation problem

[U977]

Hi all,

I can't find an explanation to this. For teh first time, I face an audio synchronisation problem.

Movie: The whole nine yards
Video codec used: XviD b. 14052003-1
XviD settings: advised by Doom9's guide for GKnot, but with VHQ set to highest value (4...).
Audio: MP3 VBR, 128 kbps as average

DVD2AVI does not report any delay after having extracted the AC3 audio channel that I want to use.

So, everything goes fine, until the end, no error reported, but the sound is not synchronised with the video. I would say I have about half a second of delay (sound too late for video).

This happens since the very first frame, and it's a constant delay.
So, I assume that DVD2AVI (1.76, I think.. From GKnot 0.28.2, latest version).

What do you think about this? Do you think it could be a DVD2AVI problem not detecting an audio delay?

I did 2 full tests, and results are the same. Once, I used Robot4rip, and once I did it the older way (encoding from AC3 to MP3 controlled by GordianKnot instead of Robot4rip).

Thanks!

[Ookami]

Did you tried CBR audio? Also, did you tried to use an container like Matroska?

Also, there are better forum to post this questions, I could name a few...

I will really start to delete threads, as I don't want that 99% of my internet time is consisted of moving threads.

Cheers,

Mijo.

[U977]

Ookami, I'm sorry.

But where was I supposed to post this question? It can be GordianKnot (since it's the tool I use), it can be DVD2AVi (since I suspect it to be the cause), or audio encoding, maybe (since it's audio sync problem)?

Sorry too for not having thought to post that to newbie forum. I thought my question was less "newbie like" than that, and less common, since I'm not new at encoding movies, and since it's the very first time in 2 years that I meet that problem.

Sorry to let you loose your time moving posts on this forum.
I know you give a lot of your time to this community, I don't forget.

I don't want to let you loose more time, please forget this question.

[OvERaCiD23]

Have you tried muxing the original AC3 just to see if it's a delay issue or an VBR MP3 issue? Try that route first and go from there. Also, did you demux the AC3 directly while ripping (in DVD Decryptor)? I've had that problem once, and when leaving the VOBs intact and extracting in DVD2AVI, the sync was fine. My best guess for the problem is the VBR audio though. HTH.

[Ookami]

@U977

Well, I didn't wanted to insult you, I was just, for the 1000 time, pointing out that people should post in the appropriate forum.

As for audio not in sync, it's a very common thing. And if you use VBR MP3 with AVI you should know that it's only "working" with some hacks and workarounds. Because of that I first thought of the VBR stuff, but it could be hundreds of reasons, if you're doing this for years you know that just as much as I.

I don't mind loosing time here, I've lost moe than I should, but I do mind when people don't conform to the owners rules and when people do ignore several other things, too.

You're right, it could be moved to several forums, but General disc. is the last in the line :) .

Please, don't take my, sometimes, harshness too personal as I really don't want to insult anyone in the real world, let alone in the virtual.

All the best,

Mijo.

[Hiro2k]

Originally posted by U977


What do you think about this? Do you think it could be a DVD2AVI problem not detecting an audio delay?



I've always wondered this too. I have has quite a few Anime's that DVD2AVI said had 0sec delay, and when I muxed the video, there was indeed a delay. So then I tried muxing in the original AC3 and it also was about of sync. So does that mean DVD2AVI is not detecting a the delay on the video? Because when I play the original DVD in my software DVD Player, the audio is in sycn with the video.

[U977]

@Hiro2k, thank you for your suggestion. Indeed, the muxed AC3 + video has a sync problem as well. I suppose it's DVD2AVI, then.

@Ookami, I understand you can be tired sometimes.
We all can have hard days :-)

However, I don't know about your own feeling, but personally I simply think logical to put my question in the general forum if I don't see a criteria in favour of a forum with a more precise topic. Since there was not more reasons to put the question to this or that forum, I've choosen the "misc" forum.
I don't pretend to be an expert, I just say I made plenty encodings (during those 2 last years), that all were using VBR MP3, than I never got any sync problem, not a single one so they are not so common to my eyes.
Here I think there is even an evidence: the AC3 itself, when muxed, produces a delayed soundtrack.

I understand you, so I'm not angry or anything at all :-)
But I hope you do understand my point of view as well.

To be moved to the DVD2AVI forum, then?

[U977]

Hi again :-)

Just wanted to let you know that I decided to use Nandub and try some delays value. -1000 ms seems to give almost synch! So I will keep my movie like this! I'm convinced there is something wong with delay detection for DVD2AVI 1.76.

Thanks for your suggestions!

[Hiro2k]

You can get a perfectly synched movie, just keep messing with the delay values. Try to find a part of the movie where there is some scene where the audio is easly timed with the video. For instance, Glass Breaking, Jumping into Water etc..

Those scenes make it easier to time the audio and so the rest of the movie will be in perfect synch. That's what I usually do to get the perfect timing.

[stax76]

@U977

don't worry, when I announce a new DVX version I don't know which forum to post as well. As for your delay issue, sure DVD2AVI can fail here, DVD Decrypter with stream processing was mentioned already but what about using BeSweet VOB input, it's the default way in DVX and works great. I think using DVD Decrypter and BeSweet is more comfortable than DVD2AVI but it seems knowbody knows what's the most reliable way. Since you tested Robot4Rip and DVD2AVI already maybe you can test BeSweet and DVD Decrypter as well and tell us if you succeed.