Captured audio is 50% slower than video

earthrisers wrote on 3/1/2006, 6:08 PM
I use Scenalyzer Live for my captures from camcorder to computer, and am generally very happy with it.
But this has now happened to me twice, and I can't yet figure out WHY:
In the captured AVI file, the AUDIO track is (not quite exactly) twice as long as the video track -- the speed of the audio is about 50% what it should be, and the pitch is correspondingly lower than it should be.

The captured program is about 75 minutes long. I "monitored" it occasionally during the capture, and it sounded right. I just now captured a very short sub-clip of the program, to see if the problem happens again, and the audio on the short clip is exactly right; in synch with the video and exactly as long as the video.

Anybody have any ideas whassup here???

Comments

farss wrote on 3/1/2006, 7:06 PM
That's a curly one. If you right click on the media what does it say about the audio stream's properties?
johnmeyer wrote on 3/1/2006, 7:29 PM
I don't have an answer that I can give to you from experience. However, I'm looking at the Scenalyzer options now. I'll give you my settings for things that might make a difference:

File-type: Type2 DV-avi (default; for Premiere; Vegas)
Time Lapse-capturing: No
Auto-capture from live-camera: No
Keep DV-Audio in-sync: Yes
Audio-mode for all .avi files written: Automatic (same as on tape)
Audio-channel to capture: first channel
Write other audio-channel to separate wav file: No

My bet is that it is the file type or you have enable time lapse.
earthrisers wrote on 3/1/2006, 10:28 PM
In the original shoot, I had paused the camera twice, when the program presenters were fiddling with their projector.
I have now RE-captured the tape in Scenalyzer, starting from right after the second instance where I had paused it, and this time the capture was perfect, with the video and audio righteously in synch.

I didn't change any settings in Scenalyzer, between the capture that got the funny audio, and the re-capture that came out right...
Most puzzling, but at least now I have the files I need to work with.

Ernie