Progressively worse OOS

kebrinton · Post by **kebrinton** » Sat Aug 06, 2005 8:15 pm

Okay, I have a DVD made from material originally on analog videotape which was captured to HD via a digital videocamera ("pass-thru").

As the DVD plays, an out-of-sync problem becomes worse and worse. At the beginning, the OOS is only a fraction of a second, hardly noticeable.

By the end of one hour, the OOS is much larger. At the end of nearly two hours, it is ridiculous -- my guests are commenting to each other. Embarrassing.

The source material is no longer available; all I have is my DVD. I didn't at first realize that the OOS problem got progressively worse. I imported the MPEG file into VS9 and split off the audio.

But how do I correct a problem that is increasingly worse? I can't just shift the audio forward a tad. That might be right at the start, but it won't be right for the latter parts of the video. What have other people done?

P4 3GHz HT, 1G RAM, 2 x160GB SATA HDs, WinXP Home, VS9 boxed

Keith

GeorgeW · Post by **GeorgeW** » Sat Aug 06, 2005 8:28 pm

when you used the "pass-thru" for capture, what format did you capture to your hard drive (.mpg, dv .avi, or other)

Did you capture as one long video, or break it into several smaller sections

What properties are you using for your DVD (bitrate, audio type, etc)

kebrinton · Post by **kebrinton** » Sat Aug 06, 2005 10:39 pm

Original capture: DV-.AVI

Captured as one long clip.

DVD created at 6000 kbps, LPCM audio, 48KHz 16bit stereo

NTSC DVD about 4.5GB in size

Used lower field first

GeorgeW · Post by **GeorgeW** » Sat Aug 06, 2005 11:12 pm

was that DV TYpe-1 or DV Type-2 (you might have better luck with DV Type-1).

Also, along your timeline, make a cut about every 15 minutes or so -- it helps to re-sync if there is any drift.

kebrinton · Post by **kebrinton** » Mon Aug 08, 2005 4:26 am

Thanks, George. I'll probably have to do that.

I always use DV Type 1 but this isn't relevant to my problem because at this point I'm dealing with the completed (and OOS) DVD. It's all I've got, and it's what I'm trying to correct.

GeorgeBW · Post by **GeorgeBW** » Mon Aug 08, 2005 10:03 am

Hi Kebrington,

It's a tough assignment ahead of you if you are trying to re-synch sound over two hours of video. As GeorgeW says... making re-synchronising cuts at intervals is about the only option you have.

I had this problem during linear assemble editing years ago. I was forced to insert simple mask type transitions at intervals where I could cut and adjust the soundtrack in the timeline.. It worked OK.. but was very tedious, and I'm talking about productions a lot less than two hours.

I know it's not much help, but my guess is that the audio was routed thru' a soundcard during capture process, or that the original sound was mixed with the video from an audio recording. Both of these possibilities would show a symptom of logarithmic increase in OOS with the sound lagging the picture.

Good Luck
GeorgeBW