Audio Sync from SVHS capture

okay, my head is about to explode. We have captured about 8 hours of SVHS footage using an AJA IOLa, using the DV/NTSC preset, 29.97fps, audio at 48K, no one can remember if we set it for non-drop or drop frame. The problem we have is that the audio drifts out of sync very badly. Any ideas?
BTW, running 10.4.8, 5.1.2, everything is up to date on this machine(G5 DP, 1.5 gigs, G-Raids, etc.).
K

Any idea why this is happening?< </div>
You can search here for hundreds of threads on drifting audio. The causes are way too numerous to attempt to diagnose from where I sit but here are some.
The problem is usually caused by your transcoding or input system. If you are patching your VHS into a DV camcorder and coming in on FW, things should stay locked. If your deck is from Canon, you have a BIG probme right there and you must use my method to make the clips the same length. Canon's DV codec is non-standard. You can easily correct the issue with my previous post by rendering the audio.
If you are coming in through a capture card, you need to talk to the mfr of the card.
The other question is why are you trying to bring that much material into FCP? Try dubbing it to a DV tape and capture only what you need.
bogiesan

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If it syncs ok using the camera and using the DSR-11 it does not, there is something in the way the canon wrote the data that the sony is having difficulty reading.
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report back

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i deleted the captured material, created a new project with the same settings as before, captured with the same settings to the same harddisk, and now everything is fine ....
i have not changed any settings, used the same hardware, i have not even restarted the machine ...
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still got me stumped ...

Our group commonly shoots instructionals that require 4 tracks of audio on the camera, thus 32 KHz/12-bit source in DV NTSC.
I have recently found that after capturing at matching settings, that the first clip, and only the first clip of the batch capture, is out of sync by about 1.5 seconds. All the following clips are in sync. It's gotten to the point where we need to log a short "dummy clip" to capture first in the batch, just to fool the system to getting our first real clip in sync.
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Thanks, Len
I hadn't thought about this option. It seems like a
lot of work. I wish there was an easier way. I have
archived ("Shared" to full dv quality) to DVD-ROM
discs all the raw .dv clips AFTER extracting the
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derekha wrote:
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Message was edited by: Russ H to add PS

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1) Operating System: Windows XP
2) I am capturing the video on an external drive with 40 GB of available space. The external drive is connected to a PC via a USB connection.
3) Computer CPU: 2.4 GHZ
4) Computer RAM: 1.25 GB
5) Video tape is about one hour long.

Hello Bill and Steve,
Your responses are very helpful. Although I was not able to fix the problem yet I do seem to think from what you both say that my system may be too slow to capture the one hour video. In any case I will copy below more details about the system as you requested:
1) Results from running Gspot:
The audio section of the Gspot window was blank. That is, no information was there. The File and Container sections say:
File Size: 12.6 GB
Note: 7.63 GB unneeded bytes at the end of the file
DV Type1 AVI
2) I did run the Gspot on another good avi file (captured to the PC with same camcorder) and says:
Codec PCM Audio
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5) The external drive I am using is formatted to NTFS.
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Thanks again,
ronel_8

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http://support.apple.com/kb/TA25603?viewlocale=en_US
http://discussions.apple.com/thread.jspa?messageID=8113985
Message was edited by: SDMacuser

Audio Sync from SVHS capture

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