Audio synch troubles again from VV4 into DVDA...does it end?

AVERAGEJOE wrote on 2/2/2004, 8:05 PM
Man, when will they fix this?

Help!
I render a live video of a band playing to NTSC DVDA from VV4.
I sync the same DAT audio track to the video and render to AC3.
Then burn the DVD in DVDA

I get sync problems..cymbals/drums/words being hit/sung, but the audio comes out about a half-second later near the 60minute mark and only gets worse as it gets later...VERY unprofessional product to present to people.

All OK at beginning and middle..the audio track sine waves are 100% in sync, every audio 'spike' lines up 100%, etc.

I am getting tired of doing fade-outs around the 60 minute mark on EVERYTHING I do to re-align the video/audio tracks.

I have seen suggestions on here to render both video/DAT to a new track in VV4, but that takes way too long, a lot of space, and double the work.

What are we ALL doing wrong? What other suggestions does anyone else have?

XP/AMD1.4/1GigRAM

Thanks
Joe

Comments

wobblyboy wrote on 2/2/2004, 8:33 PM
There is no reason to expect that your DAT tape is running at exactly the same speed as your video tape. Check in Vegas to see if your wave file is in sync all the way through the video. You may have to strech or condense the audio slightly in Sound Forge to get it to match up exactly. How are you capturing your audio to your computer? Are you using the same DAT Deck. Using a different DAT deck can cause slight variation in speed. Once you get everything in sync in Vegas, I would render to MPEG 2 and let DVDA make conversion to AC3. Remember a very slight variation in speed between your DAT and Video decks will get large as you get furthur into the video.
AVERAGEJOE wrote on 2/3/2004, 3:03 PM
I am using a Sony DAT and JVC MiniDV. The sync is 100% for the entire time on the Vegas timeline. Even when I play it, it is 100% sync in the preview window.

It seems that when it renders into DVDA compatible files, that's when the breakdown occurs. I really don't want to do MPEG2 and let DVDA make AC3 only because that will degrade the video; DVDA re-renders it.
AVERAGEJOE wrote on 2/3/2004, 3:19 PM
Tonight I realized that my thru-soundcard-captured-audio is '44.1', while the video's audio track that I am trying to eliminate/overdub/overwrite/whatever is '48'...i will try to resample it to '48'.
AVERAGEJOE wrote on 2/4/2004, 10:35 AM
No good...anyone any other clues?
nolonemo wrote on 2/5/2004, 5:20 PM
This isn't the answer you're looking for, but you didn't say if you had actually tried rendering to an .avi after putting your raw video and audio on the timeline (IIt would take more space, but shouldn't take that long even to render a couple hours worth of timeline.) Does the sync go off it you do that?
wobblyboy wrote on 2/5/2004, 10:20 PM
I haven't heard of any else having sync problems if audio and video is in sync in Vegas. I would contact Sony and see what they have to offer.
SonyEPM wrote on 2/6/2004, 6:53 AM
The DVD you made: Are you playing it back in a software player, or a hardware, set-top player?