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CS4 – Audio Sync upon capture in 12 bit audio
I’ve searched this forum and across the web but have not found a solution for my specific problem…
I’m running a Mac Pro OS 10.6.3 with PP CS4.2.1
The audio on these tapes is 12 bit, so my sequences are set to 32000 sample rate (I have not been able to find a “12 bit audio” setting anywhere…only a choice between 8 bit and 16 bit audio…and all my research has led me to conclude that 32000 vs 48000 sample rate is the only setting I can adjust to capture 12 bit audio. If there is a better solution, please tell me.When I capture 1 hour tapes (as Quicktime files) from my miniDV cam, everything appears fine with audio and video sync as I watch the footage in the capture window.
Once the tape is successfully captured (without any dropped frames), the audio files “conform”, and when I play the 60 minute clip back in the preview window or drag it into the timeline (32000 sample rate sequence for 12 bit audio) the audio goes gradually out of sync with the video.
To be more specific, the audio is in sync at the beginning of the clip, but by the end of the 60 minute clip the audio is well out of sync (perhaps as much as a second).Does anyone have experience solving this issue? It seems to me that the problem arises from the audio being 12 bit, although I’m happy to be proven wrong.
Thank you in advance for any insight or help.
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4 Replies
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32k sample rate is always a bitch. I check every DV camera I use and make sure it’s set to 48k. My advice is put your captured footage in a timeline, sycn as needed then export the timeline and cut from the newly created clip with 48k audio.
Stephen Eckelberry
Film Editor -
Hi David,
Sample rate is based on time, bit depth isn’t, so this should not affect the sync, as long as you pick 32k.
But then again, who knows what Premiere is trying to do in that case.
My advice would be getting a program like HDV split that cuts your capture into scenes, then import the whole thing on the timeline, check sync, then export again if you want the footage in one piece.
That has solved all the sync issues I’ve ever had.
Vince Becquiot
Kaptis Studios
San Francisco – Bay Area -
Thanks for the responses. Much appreciated!
I’ve been trying to sync the clips manually after import, but it’s definitely a challenge (I wish there were a rhyme or reason to the sync issues, so I could just apply a uniform solution to each problem clip).
I investigated HDVSplit, but have been unable to find a version that works on a Mac (I’m running OS X).
Thanks for trying to help. This is truly a lame problem.
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Well, you could try MPegStreamClip
I’m not sure it will work the way HDV Split will. I would definitely look into getting a copy of xp in bootcamp for these kind of things, you never know when you’ll need it…
Vince Becquiot
Kaptis Studios
San Francisco – Bay Area
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