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syncing drop frame video w/non-drop frame audio?
I am beginning a multi-cam XDCam FCP edit where multi-track audio was recorded separately from the mxf files to stand alone wav files (I do have audio reference on the mxf, but not multi-track).
The video was shot drop frame, but the stand alone wav files were accidentally recorded by the sound tech as non-drop.
When I try to sync the wav files with the converted mxf>mov video files in FCP, I get a gradual audio drift, that gets worse and worse over time.
I presume that the problem is a DF vs NDF issue, but I’m not entirely sure. Anyone have any suggestions on how to correct this problem?
Thanks!
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2 Replies
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I’d make clones of the wav files and then change the timecode on the cloned wav files to DF. There should be a utility somewhere to do this. Try relaying the cloned wavs after re-timecoding and see if that helps. If not, the answer lies somewhere else.
Del
smoke, photoshopCS3, FC Studio2 -
[Jeff Schmidt] “I presume that the problem is a DF vs NDF issue, but I’m not entirely sure.”
DF vs NDF should have nothing to do with this, because 1) all the TC does is count frames, and the difference between DF vs NDF is how they’re counted and 2) there are no frames in audio files, anyway.
Most likely this is a sample rate issue. Your audio should have been recorded at a sample rate of 48kHz. Check to see that it wasn’t actually recorded at either 44.1 or 48.048.
That last one is often used on film shoots to accommodate the pulldown from 24fps to 23.976 (23.98 to us FCP folk), and is sometimes interpreted as 48k, which would automatically slow it down the correct amount to compensate for the film to video slowdown.
Arnie
Post production is not an afterthought!
https://www.arniepix.com/
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