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Audio sync problem
I haven’t been able to find a post for my specific problem, though it may be out there.
I recently used Premiere Pro 1.0 to capture video from an SVHS VCR deck. This is the route the capture took:
SVHS deck –> Sony TRV50 mini DV camcorder (using AV to DV pass-through) –> firewire (both audio and video) –> PPro 1.0 capture
However, when I placed the, roughly, 60 minute DV video into the timeline, I noticed that the audio and video began to lose sync. By the end of the video, it was off by several seconds. I also get this problem when I pass through the camcorder with other inputs such as from a DVD player and regular VHS deck.
What could be causing this issue? I do not have this issue when I am capturing DV video straight from my DV camcorder.
Here are some specs:
Windows XP Home
2.53 GHz Intel
1 GB RAM
built in firewire (on the motherboard)
Sony TRV50 camcorder
JVC SVHS deckThanks.
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7 Replies
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Try dubbing to a DV tape and see if the same happens, also make sure the camcorder is set for 48khz and the same with the project.
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I have thought about doing that and will give it a try and let you know the result. Also, I will check the camcorder’s audio settings to make sure they match with the capture and project settings on PPro. One side question on that…if the settings on the camcorder do not match those on PPro, wouldn’t that also cause sync problems with capturing straight from DV tapes as well? Thanks.
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Here’s an added note: I checked the manual on the Sony TRV50. It says that under the 16-bit audio setting, the audio records at Fs 48 kHz stereo. I have it set to the 16-bit setting and the PPro project is set to 48 kHz. Is it possible the analog audio signal is 32 kHz or below and is being passed through the camcorder as such (I have no idea on this one or even if analog audio would have those kHz settings). Thanks.
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I know I keep posting to my own question, but I did learn just now that the audio on my captured video is set to 44.1 kHz which would explain the problem. I don’t know how I missed that. Is there anyway that audio can be fixed/converted in Premiere? Also, how to I prevent this from happening in future analog to digital pass through captures (why does it record at 44.1 kHz)?
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Alright…last post before any more responses, I promise. I made a mistake…the file is 48 kHz. I was looking at the wrong file (working too fast). I played it on Windows Media Player and the audio and video are out of sync on that as well. The video is lagging behind the audio and it gets more and more out of sync as the file plays.
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[Paul W] “the file is 48 kHz. I was looking at the wrong file (working too fast). I played it on Windows Media Player and the audio and video are out of sync on that as well.”
Usually DV audio doesn’t go out of sync unless the audio is unlocked from the video or the recorded sample freq is off.Did you check in the VCR mode and see if you were 12bit or 16bit, the default on most Sony cams is 12bit.
You need to make a analog->DV dub in the VCR mode and then see if it captures OK.
If you don’t have this problem with tapes you recorded in the camera mode, but have it with tapes made in the VCR mode the sample freq maybe drifting while in the VCR mode -
Thanks for the response. I know that I’ve had 16-bit audio setup under the VCR mode of my camcorder since the day I bought it. So, there must be another mechanism at play. However, I am going to try to record it first on mini DV tape (making sure the audio and vido are sync’d) and then capture from the mini DV tape. I will post the results as soon as possible. Thanks again for your help.
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