Minor annoyance with captured clips.

farss wrote on 9/19/2004, 3:08 AM

Don't know if this starts out as a Vegas problem but it doesn't handle it that well anyway. After capturing 3 hour tapes with DV scene detection on I find in some of the captured clips the audio overruns the video by a couple of frames.
No big deal except when I go to trim the clip, Vegas decides to only trim the video. If I extend the clip (i.e. loop it) then trim it all is well or else if I use the Shuttle to trim one frame at a time also all is well.
Hardly the worst thing I've had to 'keep a watch out for' but I'm just wondering if anyone else has seen this and how does the audio overrun for a couple of extra frames.
Bear in mind these are DVCAM tapes (And yes recorded in DVCAM!) so the audio should be locked me thinks.

Bob.

Comments

Erk wrote on 9/19/2004, 5:57 PM

farrs,

I often see the same thing. My understanding, as Chienworks once explained it, is that while our video falls on frame boundaries, audio is bound by samples (I'm probably garbling some of the technical niceties here). Re: the trimming problem, I think I"ve experienced that as well. Whenever I see the audio extending past the video, I try to remember to grab the audio portion when trimming, then its associated video clip trims correctly.

Chien's fuller explanation was in a post here some months ago; I can't remember the subject header for a search, but maybe he or someone else more knowledgeable will chime in here.

Greg

farss wrote on 9/19/2004, 8:46 PM

Thanks,
glad to see others have noticed it, that's mostly all I wanted to know. Having blown the budget on a DSR-1,1 I just wanted to be 100% certain it didn't have some odd glitch in it.

Bob.

rmack350 wrote on 9/19/2004, 8:49 PM

I've never noticed it going whole frames past the end of the video stream but it definitely extends partial frames past the video (for me).

This is also DVCam tape. Captured with a DSR11.

Also, Vidcap always sets the time code as drop frame even though it was set as non-drop in the camera (DSR500). Probably not a factor here but it doesn't inspire confidence in anyone at the shop I work at.

I wonder if there's a difference, though, in material captured from DV and DVCAM?

Rob Mack