Sync Problems After Capture

jkb242 wrote on 1/24/2004, 3:19 PM
I am archiving several VHS tapes recorded with a Sony VHS VCR to DVD for permanent records. Captures of some tapes gradually creep out of sync (video audio sync) while other tapes in this set remained in sync without any deivation.

The sync issue is between video and the associated audio track. There are two capture formats available to me that are compatible with my ATI All in wonder 7500 Radon capture card. One always seem to work better than the other so I use that one as default but for two of these tapes, using either capture driver or format will not keep the two tracks in sync. This seems very odd as the video and audio are always in sync throughout all tapes.

Can someone assist and possibly point me toward a solution as to how can keep the video and audio in sync. I have exhausted every idea I have had. I can get the sync correct at any place in the capture by ungrouping the audio and video events and moving them so that all is fine, but if I am half way through the tape the sync is out again at the beginning or at the end. There seems to be no end to this

I am sure that several folks have encountered this problem as well, how do I filx this??

Thanks so very much.

Jerry

Comments

farss wrote on 1/24/2004, 3:38 PM
The way you're capturing is the culprit. I'd suggest using an ADVC-100 or better stil the ADVC-300.

Your problem is that the speed of the audio isn't the same as that of the video. To fix that get the beginning in sync, go to near the end where there is some easy to sync thing like a door closing. Now grab the end of the audio track and holding down the ctl key drag it to get the sync point correct. This'll slightly alter the speed of the audio, its shouldn't be enough to be noticable.

Also DVD is NOT a good archive if you ever want to retrieve you video. I'd recommend splitting the avi into suitable length bits and burn them to DVD as data files. Going to DVD-Video and back again is not a lossless process.
RalphM wrote on 1/24/2004, 7:55 PM
Another possibility is the use of Scenalizer which has an option for keeping A/V in sync. It works well. Costs around $40 US. Search on the name to find the site.
jkb242 wrote on 1/25/2004, 9:55 AM
How eactly is this happening? Why does it happen on some tapes and not others?

How can an external program or device keep this from happening as you recommended?

Mush thanks for your very helpful information.