Audio Sync Problem, Any Ideas?

jgourd wrote on 5/20/2001, 6:08 AM
When I render large projects of 45 minutes or more the audio gets out of sync toward the end.

By the end of a VCD MPEG-1 file it is off by a second, 4MBit Windows Media it is off by a few frames but still noticeable. Its a fast machine with Ultra 160 drives, I bump the vegas process priority up to "Above Normal" and nothing seems to work.

I would use cleaner5 to re-render from DV but it crashes more than it succeeds.

Comments

jgourd wrote on 6/1/2001, 4:29 PM
Replying just to push the topic up to the present.
chaboud wrote on 6/1/2001, 4:39 PM
You're coming from DV?

Is your camera a Canon? Your drift might be an unlocked audio problem from the source.

Are you working on an edited project, or is it just a conversion that you're doing in Vegas?

jgourd wrote on 6/4/2001, 11:46 AM
I think I have found the problem. It is the source files in MPEG-2. In this case I am taking captured MPEG-2 streams from my ATI card and just chopping out commercials (yeah, I know,Vegas is overkill for this but I use it for DV editing too.). It turns out that the ATI card looses audio sync after about 40 minutes of recording.
chaboud wrote on 6/4/2001, 5:33 PM
That kinda stinks, but you could correct the problem with Vegas. Just a simple Ctrl-Drag should take care of any regular drift.

If it's less accumulation and more an instantaneous error, then you're going to have to spot-check.

Best of luck