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23.98 audio match-2
Cow Gurus, – added clarification to first post-
Here is what seems like a standard audio/film issue that has worked in the past. Now we can not explain our problems in syncing HD dailies inside FCP- Studio 2 upgrade version.
Problem is that field audio is recorded 48.048kHz 30 NDF SMPTE timecode for pulldown to 48kHz to match film shot at 24fps and transfered at 23.98. My understanding was that 48.048k audio in a 48k should play slightly slower than originally recorded matching the slowdown to the film, but that doesn’t seem to be the case. Resampling the audio to 48k externally does allow the audio to hold sync, BUT when the editor makes subclips from the sequence the audio and video in the subclip are out of sync by several seconds (by different amounts for different subclips).
It’s also possible that it is something in the procedure of resampling, or in linking the re-sampled audio as we did the sync with the original audio and then linked to the resampled audio. BUT either way, when we resample (using Digital Performer 4.6) we loose the original TC reference of the audio track which may create issues in finding audio takes for final post, right? Is there a way to sync and keep the TC of the original audio tracks.
This is standard film to HD workflow that others have probably seen previously, what are we doing wrong? Help! (are my lips in sync?)
Thanks, Film Joe
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1 Reply
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When you open one of the original audio files in quicktime, what is the sample rate listed?
I’m currently doing a film with 48.048 sample rate, 30 ndf timecode, but it was recorded on the Sound Devices 722 using the 48.048F setting. This is a 48.048 sample rate, but the files are tagged as 48K in their header (hence the “faux” F setting). Thus the edit system doesn’t have a chance to interpret them at 48.048, instead playing them back at 48K and thus slowing them by 1/10th of 1 percent (.1%).
Not sure about your resampling issue. Another thing you could try is conforming the audio using Cinema Tools (haven’t tried this). But when you conform in Cinema Tools, it merely rewrites the timebase to the Quicktime file, leaving everything intact, and maybe this would work.
You could also try using a speed effect of 99.9 on the audio to get it to sync.
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