Weird audio problem. Please help a guy on deadline! :)

slacy wrote on 3/17/2004, 9:57 AM
I have a section of narration that is synched to relevant video. Here's my problem: each time I preview from the timeline, the audio seems to lose its synch. Sometimes a certain word will play on time, other times it's a second or so late. It's very erratic, and I haven't been able to determine a pattern.

As you can imagine, this is causing me some editing nightmares.

I do have mixed audio (44.1 and 48 khz) on the timeline but the problems only occur in one isolated section. I should point out that I'm also using the time stretch filter on the audio track that is causing the problem. My gut tells me time stretch is the likely culprit. Anyone encounter this issue before?

Comments

TheHappyFriar wrote on 3/17/2004, 10:06 AM
I had a simular problem once, but I taped something from VHS and the audio/video got out of sync. I tried stretching the audio to fix it, but it ends up that stretching (or, in this case, compressing) the video was better (no more outta sync).

I don't know if I helped, but maybe that gave you an idea or two to try.
AlistairLock wrote on 3/17/2004, 10:08 AM
If the "preserve duration" box is not ticked, that may be causing the problem.
However the mixed out audio should be correct and in sync.
slacy wrote on 3/17/2004, 10:21 AM
Where is the "preserve duration" checkbox? I don't see it in the Time Stretch filter dialogue?

It would seem to me that Time Stretch, by definition, should be consistent.
Jsnkc wrote on 3/17/2004, 10:21 AM
If it is only doing it when you play the video from the timeline that is completely normal. I would try to render out a small section that you think is out of sync, and I'd be willing to bet that it will be in sync once you render it out. Vegas has to process a lot of things when you do a preview and sometimes things can appear out of sync when they really aren't. This is usually a lot worse if you are using a external monitor to preview.