Rendered audio drifts out of sync

sean@oregonsound.com wrote on 9/30/2006, 11:19 PM
Ripped a DVD to hard drive (MPEG file),, brought it into Vegas 6 for some audio enhancement, then rendered for burning in DVDA 3.0. While the audio in the original import is fine, the audio drifts out of sync with picture in the newly rendered file. Can anyone think of any reason why this would happen? Thanks for any help.

Also, any recommendations for a good, all-purpose DVD ripping program?

Sean McCoy

Comments

Grazie wrote on 10/1/2006, 12:02 AM
I'm truly listening to this. Using some form of audio enhancement eh? What was it exactly?

If you mean putting in one of my DVDs and then copying that - I use DVDShrink - so simple even I can use it! And it IS free
gordyboy wrote on 10/1/2006, 9:48 AM
Could be the audio properties of the project don't match the ripped audio... although Vegas is supposed not to be bothered by such things.

I would try setting all audio properties in Vegas and DVDA to 48khz and seeing if that makes any difference. If the audio was ripped at 44.1khz, I would resample it to 48khz.

gb
sean@oregonsound.com wrote on 10/1/2006, 10:52 PM
The whole process has been strange. I was only able to rip what I wanted (one long track) from the DVD using Roxio Media Creator, which created one large mpeg file. The mpeg file plays back fine in Vegas 6, where I did a little EQ and compression on the audio and rendered a new mpeg for re-burning in DVDA3. Since the ripped audio was part of the mpeg, it should be safe to assume it was at 48 kHz, no? But the rendered mpeg file from Vegas shows audio drift over time (I also tried an AVI render with the same problem).

What's more is that I can't re-burn even the raw ripped mpeg file because DVDA says it's too large to fit on a standard DVD---even though the DVD from which it was ripped was definitely a stock, 4.7 GB disk. (It was likely created from a VHS to a realtime DVD burner, however, if that makes any difference) I would split the file onto two DVD's, but I can only do this in Vegas (as far as I know), where the sync problem rules it out. Sheesh, what a hassle!
gordyboy wrote on 10/2/2006, 4:28 AM
Hmm...

If you right click on the audio track in Vegas, what are the audio properties reported as?

How do these compare to the project properties (ie the settings in the audio tab) you are using?

And then what are the project properties (audio tab) in DVDA you are using?

DVDA will report weird size limitations from time to time and particularly if the project properties don't match the source files. That might be part of it.

gb

GenJerDan wrote on 10/2/2006, 5:09 AM
I've had the same problem with ATI All-In-Wonder-saved television shows. The MPEGs play fine, but if I bring them into vegas to chop them down to reasonable sizes, the audio goes out of sync.

Annoying.
ScottW wrote on 10/2/2006, 5:50 AM
DVDA frequently gets size estimates wrong when dealing with things that it doesn't expect (or that aren't normal for it). Audio multiplexed with video in a single file is one of those things.

My suggestion would be to demultiplex the audio and video from the single MPEG file - you can esaily do this by going back to the original VOB and using something like VOBedit. You'll likely then need to remultiplex the video portion into a program stream (Vegas still doesn't like elementary streams). The MPEG tools available with the TMPG Encoder can do this, just use simple multiplex and don't specify an audio file. The MPEG tools do not require that you purchase the TMPGenc license.

Yes, this workflow is a bit of a hassle, but I've had good success with it in terms of keeping audio in sync with video.

--Scott