Audio drift on large file from VOB

photosynth wrote on 9/10/2007, 5:02 PM
Hi Guys,

I'm a 6.0 user. I've been given this project to convert from analog tape to Digital video. There are (2) 1 hour and 30 minute videos that I've dubbed from the original 8mm analog tapes to my stand alone LiteOn DVD recorder (which appears to have split the files into 4 individual mpg. files on the resulting DVD's). When I view the resulting DVD, the everything appears to be OK.

Problem is,.... when I import the DVD into Vegas,...... by the time I am toward the end of the "hour and a half videos", there is almost a second and a helf of audio drift,..... which I just can't sell to my client.

Do you have any suggestions as to how I might otherwise correct or avoid this issue?

As a side note.......I also have a Canopus DV Storm 2 card on another certainly more powerful computer that I have not yet integrated into my studio, but I have not brought it online as a working part of my studio because of the imminent due date of this particular project.......... Even then, Vegas doesn't directly support capturing with a DV Storm 2 card, so I might just be opening up a whole new can of worms there.

Unfortrunately, Canopus( at the time I purchased the DV Storm 2 "2001" was paired up with Adobe Premiere,..... which I have since abandoned because of my wish to be a Vegas guy instead) has no easy conduit of import with Sony( that I'm aware of). ughh!!!!

In any event, I really respect you guys and humbly ask for your help.

All suggestions are welcome. I'm confident someone here can stear me in the right direction.

Thanks in advance for your help.

Comments

MPM wrote on 9/10/2007, 6:04 PM
I've read complaints about Lite-on DVDRs, but never used one so can't really say much about if your recording could be way or not. Regardless, if you've got it on DVD & deadline's approaching...

Your DVDs are not likely in regular DVD format -> use PgcDemux to strip m2v & ac3. If you plan on any audio edit, convert ac3 to wav. If you want to use DVDA, convert m2v to mpg video-only file. If you want to edit m2v in Vegas 6, optionally consider DGIndex & VFAPI as an alternative -- creates a proxy avi that might render better from Vegas -- and otherwise convert as for DVDA (TMPGEnc's MPEG Tools works well). Audio length should be good, but if problems stretch in Vegas & render audio file -- DGIndex method works well as something to gauge audio against in Vegas for audio only work.

Pros: DVDR = *maybe* better filtering. Analog Capture to DV = better initial quality & if you're going to edit, enough quality to take the hit from mpg2 encoding.
Chienworks wrote on 9/10/2007, 6:15 PM
My experience has been that sync is always poor when importing a VOB. Sometimes i can partially correct it by Ctrl-dragging the video to match the audio or vice versa, but even with the beginning and end lined up there will be spots along the way that are far out of sync. I finally just gave up on the idea completely.

Now when i want to use DVD material i play it in my settop DVD player and capture the analog S-Video and audio outs with an external A/V->DV converter box. Sure, it's only a real time capture so it can take a long time, but the time i save trying to fix the sync more than makes up for it.
photosynth wrote on 9/10/2007, 8:15 PM
Hmm... thanks guys!

Not sure what to make of this yet. What a pain in the brain!

I have the original tapes and i have the DV Storm 2. But was really hoping not to have to scramble to get that whole sytem going so fast. At this point,.... I'm wondering if I have a choice.

Audio drift is such a huge pain in long pieces.

Fixing it appears to potentially take hours...which may or may not work.

I am most grateful for the input given thus far. I welcome additional slants on this issue before I pick my road of fate.

Thanks!!
photosynth wrote on 9/13/2007, 4:38 PM
Bump!!

Hi Guys,

still looking for insight here. Give me your opinion on what works best. Thanks!!!!!

Pat
marks27 wrote on 9/13/2007, 5:34 PM
Dealing directly with MPEG2 (DVD) files is often frustrating.

I think the demux'ing suggestion presented above by MPM.

DVD/MPEG2 is a highly compressed format, so there is a high level of data loss, which includes timing information used in maintaining audio/video sync. I would re-encode to uncompressed AVI, do your editing and then re-encode.

A pain, but it will probably give you the best results.

Ciao,

marks