whats the diff cause in gradual out of synch vs constantly out of synch?

[Rudyard]

In converting old VHS to PC to DVD I have been having no problems with quite a few captures.
However there is 1 tape I have and it has the age old problem of audio synch.

I captured to a seperate HDD via my VIVO on my graphics card in uncompressed AVI like I did all my others and edit/render in VEGAS 5, but this one tape has caused the problem of the captured file when played through WMP having no audio synch problems but once I import it into Vegas it is instantly out of synch.

Ive noticed when reading the forums that people ask if it gradually goes out of synch or if it is out straight away.

Well mine is out straight away and I actually fixed the problem by moving the video so it started after the audio until it was in synch.

I dont understand why the file when played in WMP plays in synch but once in vegas when both previewing and after render it is out of synch.

So when asking if it goes out of synch gradually or instantly what is the different approach to finding the problem?

Also could it just be something wrong with the tape as it only happens on this tape (so far), but then it plays fine in WMP before it goes into vegas.

p.s. just off topic also when trying to move the audio or video seperate from each other in vegas, they both seemed to move together. I had to render the audio of the AVI to a wav, delete the audio from the track and replace it with the wav before I could move them seperately.

How do you move them seperately without rendering the audio to a new track?

[Scorpion King]

Your constant out of sync sounds like offset. When I use MMC to capture AVI with my ATI card this happens every time. The AVI file plays perfect in WMP but will encode out of sync. A nightmare before I understood what was happening. In my deal the audio and video are not the same length and an offset value must be used. WMP will use this offset value I suppose because they play fine in it, but the offset value is lost during encoding so I must provide (input) the value into the program. To find this value I use VirtualDub. If my AVI files play good in VD then they are in sync. If they are out of sync then VD will show it. You can enter the correct value of offset in VD - Audio - Interleaving - Audio Skew correction ms. A value of 1000 = 1 second. You can also enter negetive numbers to offset the audio the other way.

My AVI offset is easily corrected in VD. I can simply note the length (in time) of the audio and the length (in time) of the video, determine the difference, then enter that number in the Skew box. You're offset may not be so simple to find, I don't know.

Audio that appears to be in sync at the begenning of the movie then seems to gradually go out of sync is more difficult to determine the reason for, and the correction steps necessary to repair. It might be a simple fix, then again, maybe not.

Good luck.

[Rudyard]

Thanks scorpion king, the audio and video lengths do seem to be different when i import them into Vegas (I cant understand why as the audio and video are recorded from the same source at the exact same time...when I press start and stop on the vcr I would assume the video and audio to be identical in length).

I will test in virtual dub and then try to find a way to do it in Vegas.