Extracted WAV shorter than AVI - Help

[robomonkey]

I've used vdub to extract the audio from an AVI, the the resulting WAV file is approximately 20seconds shorter.

This means when I encode in TMPG by the end of the movie the audio is out of sync, plus TMPG just closes itself without any error.

Anyone know how to fix and or what causes this problem

[ZippyP.]

You could try another program to get your wav file, I use Goldwave. Just load your avi then select save. Goldwave also has a "Time Warp" function that can stretch or shrink your wav file to fit. Good luck!

[robomonkey]

Hey thx Zippy I'll give it a go

[legionpc]

Yes, goldwave should do the trick. I find vdub often screws up like this with audio.

[robomonkey]

Man Goldwave is slooooow, it's taking nearly 20 mins just to open the file!!!

Will post again when I've extracted the wav to say how it went.

But does anyone know why this is happening in vdub?, cos its the first time I've seen it happen.

[robomonkey]

Nope Goldwave does the same, the AVI is 2:46:44 and the WAV is 2:46:23.

Does TMPG have an option that 'stretches' the audio to fit the video?, can I turn it off?

[robomonkey]

Well I tried everything now, Goldwave after about 1.5 hours ate 8GB of disk space in tempory files before crashing due to lack space.

I give up, what is causing this? is it blank frames in the movie that have no sound whatsoever. I've checked the AVI for bad frames but that was ok.

Is Goldwave my answer?, how much space and time do i need, my avi is 1.5GB and i have 1800XP how long will that take to open and then timewarp and then save out wav?

Thx for your help

[robomonkey]

Ok, I'm convinced that its not a problem with the application I'm using (i.e. Vdub), as all of the applications I've tried report the same length, yet the movie plays fine in Media Player.

Even if I do a direct copy to MP3 file (which is the correct length) and then convert the MP3 file to WAV I still get the shorter length.

I've scanned for bad frames and found none and I've scanned for freeze frames and found none.

But...

When I tried recompressing the movie using Vdub and different codecs for audio and video it gets 2 thirds of the way through and reports an error saying "cannot decode frame 88720, could be due to corrupt data, error -100".

I read loads of similar posts on the forum but none have any answers, One of you Guru's must know the answer!!!

[ZippyP.]

I have had this problem which appears to be bad frames that Vdub for some reason cannot detect. I had to cut out the bad frames manually, your error message gives you a good idea where it is. Check the Edit section on how to edit with VDub.

Goldwave should only take about 5 minutes on your machine to load the file and the same to convert/save. If your audio is still out of sync after editting, then Goldwave has several tools to help correct it. If it goes out of sync gradually then you can use "Time Warp" to shrink or stretch the sound. You can also insert an audio delay if the audio is off by a fixed amount. In my case, I had 1 part of the movie in sync and 1 part out. I had to edit the file, split it, fix the sound and then rejoin it.

Hope that gives you a few hints that might help!

[robomonkey]

Why is Goldwave crap on my computer then? Could it be down to codecs? And do I really need masses of disk space available? or is it doing something that I need not do?

Sorry for all the questions

[ZippyP.]

I suspect it's just the bad frames screwing you up. Take out the piece around frame 88720 and see if that helps. No, Goldwave doesn't normally require any more disk space than is needed for the uncompressed wav file, about 1-1.5 GB. If you're unsure about codecs then get Gspot from the Tools section, it will test and report on your file.

[robomonkey]

Yeah I guess thats what it is, but why didn't Vdub the bad frames on scan?, is there another application about for scanning for bad frames?

[2man]

i have the same problem in one avi file (DIVX)
so after many tries (2 days) i when to TMPEG and choose the avi file (directly)
then adjust my settings (128-stereo) choose only audio to encode e that´s done in 8 minutes no desync audio
2man

[onlyone]

*BUMP*