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Old March 13th, 2007, 03:36 PM   #1
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Mini-Disc Why does the sync drift?

I use a mini disc recorder with a tie clip mic on occasion. I capture it as a wav file.

What I find is that, if I sync it up in Vegas it gradually drifts out of sync with the camera audio and I end up having to chop and re-sync throughout the piece.

Anybody care to explain to me whats going on?
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Old March 13th, 2007, 04:52 PM   #2
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See my posts in this thread, should explain somewhat -

http://www.dvinfo.net/conf/showthrea...t=canopus+sync

Be sure to follow the canopus link, it'll give you more info... Steve
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Old March 13th, 2007, 05:14 PM   #3
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I also use mini disc recording. I have had similar issues with long recordings. And I think the recording and capture (apparently using analogue capture) probably introduces a time variation. I also have a HiMD which allows direct conversion of the digital capture files to .wav, eliminating the analogue conversion, but if I recall right, I can occasionally get off a bit there too. So I adjust as I go. The simple matter is that the two recording devices are not synched, so they will not be exactly on during a one hour recording. I did use the HiMD recently to record a musical play, and shot with the VX2000, and I was amazed I didn't have to do much adjusting, once I matched things up.

I also seem to recall that in Vegas you can adjust the length of the sound or video clip to match.
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Old March 14th, 2007, 08:44 AM   #4
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Quote:
Originally Posted by Chris Barcellos
I also seem to recall that in Vegas you can adjust the length of the sound or video clip to match.
You certainly can. With a minidisc, it's usually the audio that's a wee bit slow so here's two workarounds.

#1. Make sure the audio and video are lined up at the beginning.
Go to the the end and place your cursor on the right hand edge of the audio clip. There should be a straight line in the icon.
Hold down the CTRL key and it should change to something like ~.
Whle holding the CTRL key down, drag the audio to match the video.

#2. Right click on the audio track, select Properties, Audio Event tab, Time Stretch/Pitch Shift "classic", check "pitch change lock to stretch", and enter the new time duration (longer or shorter than existing, as needed).

BTW, these suggestions are from the Minidisc recorded audio sync drift? thread on the Sony Vegas forum.
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Old March 19th, 2007, 04:28 AM   #5
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Cheers for the posts. I just had a sudden thought.

My camcorder I think records at 48kHz as does my mini-disc.

My soundcard is a creaky old Audigy that has a known glitch in that it can't handle 48Khx and i have to set project properties to 44Khz.

Could this be relevant?

New PC is on the cards soon, so this will be dealt with at that point.
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Old March 19th, 2007, 08:38 AM   #6
 
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yes, that could be an issue.
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