Audio Synchronization Is Off After Render

MUTTLEY wrote on 11/7/2004, 10:18 PM
Another new one for me:
Everything looks/plays perfect in the timeline of a 30 second spot I'm working on. The first twentyfive seconds are voiceover so you can't really tell anything, but the last clip is someone talking directly to the camera. Though its right in the timeline, no matter how I render its off by a good two seconds from the video in the rendered version.

I figured I'd post this without all the specs and see if maybe someone already has an answer to this one before I get all technical. I'd be happy to elaborate if this one don't ring a bell for anyone.

- Ray

www.undergroundplanet.com

Comments

GaryKleiner wrote on 11/7/2004, 10:21 PM
Commence elaborating.

Gary
MUTTLEY wrote on 11/7/2004, 11:11 PM
The video was shot in 24p with a Canon XL2. The project properties NTSC DV 24p (720x480, 23.976 fps) , Framerate 23.967 (IVTC Film).

I have tried multiple export options:

NTSC DV
NTSC DV 24p (inserting 2-3 pulldown)
NTSC DV 24p (inserting 2-3-3-2 pulldown)

All result with sound out of sync, some with additional probs with the video.

If ya need more specifics just ask.

- Ray

www.undergroundplanet.com
MUTTLEY wrote on 11/8/2004, 9:49 AM

Anyone ... ? Anyone ... ? Kinda sorta screwed here.

- Ray

www.undergroundplanet.com
MUTTLEY wrote on 11/8/2004, 10:10 AM
So I just noticed something. In the original project, if you go straight to the end where the line is spoken and play it, the spoken line is right on que. But if you watch the entire project even before rendering, the line is off. This is true even if all the effects are off and I have it on Draft ( Auto ).

Watching it play the cursor goes over the line ( waveform ) but is heard a second or two later. Same if I do a Dynamic Ram Preview.

- Ray

www.undergroundplanet.com
Jay Gladwell wrote on 11/8/2004, 10:29 AM
Although I have the XL2 and Vegas 5, I haven't done anything yet in 24p. Looks like I'd better start! Have you considered calling Vegas tech support?

Jay
winrockpost wrote on 11/8/2004, 4:07 PM
I had a similar incident with regular dv footage, rendered project to a new track, played fine in the preview, print to tape the audio was off. On a deadline and out of ideas at 3 am or so I finally put the newtrack on a firewire drive and opened in vegas 4 on another computer and all was well. Never figured it out and it has never happened again. Speculating after the deadline I think it was caused by prerenderd files ,or skf files. but who knows.
SonyEPM wrote on 11/8/2004, 5:02 PM
Muttley- the last event that's off in terms of a/v sync: Please select just that audio timeline event and render as .wav to new track. Does this new file line up with the orginial audio in the timeline?
MUTTLEY wrote on 11/8/2004, 7:39 PM

Thanks guys.

SonyEPM, pretty much what you said. Finally caved and called into tech support. I was given the voice over in mp3 format. Tech support suggested rendering it out as a wav as some mp3 codec compress different and ... um, sumthin sumthin. A little fuzzy on the details but understood the concept.

Anyway, the moral of the story I suppose is that if a client is bringing you audio, try to get it in a wave.

Thanks again.

- Ray

www.undergroundplanet.com