Audio / Video sync issue with a 30 minute 1080i capture at DVinfo.net

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Old January 12th, 2006, 06:32 AM   #1
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Location: Melbourne, AUSTRALIA
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Audio / Video sync issue with a 30 minute 1080i capture

Hi all,

I did a search for this problem and saw a few people have had it happen but I'm curious as to solutions.

Today I recorded 30 minutes of footage on my Z1 at 50i without pressing stop. I now want to capture all of that 30 minutes to my PC using Aspect & PPro at 25i.

So first I tried it with Scene Detect off - (given that there are no scene breaks anyway). And the result was a sync problem. In fact, the audio was clearly out of sync with the video from the very start of the clip.

After my research on the forums today I am currently trying it again with Scene Detect on but I doubt it will work, given that I did not press stop.

So I have a couple of questions here:

1. Why does the problem occur in the first place? (In my case the video was ahead of the audio - which seemed the opposite of what I'd have expected)
2. What is the maximum amount of footage I can capture before sync issues start to pop up?
3. Do I need to always be thinking of this problem when I'm capturing so that I make sure I press stop every few minutes on the camera so that when I capture with Scene Detect on I avoid the issue?
4. Or do I make more work for myself in Post by manually capturing 10 minutes (or whatever the maximum is) at a time?

This is quite an annoying problem and I forsee many problems in the future - I had planned to use my Z1 as an analogue->DV convertor and transfer all my home movies to my PC - but now I can see it may not be just as simple as plug it in, press record and go have a beer, come back in 2 hours and it's done...
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Old January 12th, 2006, 09:57 AM   #2
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If think you will find the re-capture will be fine. There will be not drift over time as the video and audio are locked together. If there is a fault with scene detection off that hasn't been reported, other than issues that can occur in MPEG that our scene detection code will handle. Try the recapture and report.
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Old January 17th, 2006, 01:48 PM   #3
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Location: Denton, TX
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Was there a resolution?

I would like to know if capturing long recording is an issue for Aspect HD. I just purchased an FX1, and am debating with myself the format in which to record. My typical recording scenario is 45 minutes to 1 1/2 hour, non-stop. Will capturing HDV with PPro/AspectHD in such a situation cause sync drift?

Thanks,
Matt
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Old January 17th, 2006, 02:02 PM   #4
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Matt,

It will work fine. If you have any doubts please use the free trail.
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