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24p footage captured at 29.97, sync problems
Hello,
In capturing footage for a documentary, some of our 24p footage (which was shot on the Panasonic DVX100a) was accidently captured in FCP with the settings at 29.97. We captured the whole tape in one clip and the audio/video is not synched now – the audio plays for the last 12 minutes of the clip over black video. The video is playing in fast motion but the audio is not.Is this is a problem with how FCP is interpretting the footage? Do I need to recapture? I wanted to ask here before I do, since it will require recapturing about 5 hours of footage.
Thanks in advance,
Taylor -
7 Replies
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You should read up on what exactly is happening when you shoot 24p on NTSC cameras.
The short asnwer, capture 29.97 unless you shot 24pA.
Jeremy
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The other posters are right, you captured your footage at the right frame rate (unless it’s 24pA and read that link). However, I have seen significant drift on tapes like this.
What version of Quicktime are you on, what version OS and what version FCP?
I’ve seen WEIRD stuff with FCP 5.1 and later versions of QT, also when digitizing on an FCP 5.1, QT7 or so machine, and moving it to an FCP 6.x and QT7.5x machine, stuff is wildly out of sync.
I think that’s more your issue than any frame rate concerns.
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First of all, thank you for the responses.
My mistake, the footage IS 24p Advanced and was captured at 29.97. It is in a 23.98 timeline and the video plays in fast motion, audio is normal.
Here’s the odd thing. When I play the self-contained clip in quicktime, it is synced and works fine, the duration is 28:37. When I import it into FCP and watch it in the timeline, the video stops at 23:05 and the audio plays until 28:37. Basically, the video is playing fast and the audio is playing normal speed.
This seems like a quirk since it plays fine in quicktime.
FCP Version 6.0.5, Mac OSX 10.5.5, Dual-Core Intel Xeon.
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Right, that’s the sort of shenanigans we’d see with QT/FCP issues, it was boggling. Be fine in QT, but as soon as you brought it into FCP, it had fits. But it sounds like your QT is up to date if FCP is.
Anyway, nothing solved the problem other than redigitizing, wYour other clips that have been digitized, are they in sync?
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With 24pA material, it is best to log and capture rather than try and capture the whole tape in one go. There’s very specific cadence information in the video stream and FCP needs to get it right. Recapture in smaller chunks and you should be good and be sure to use the 24pA easy setup.
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Got it, I will try re-digitizing.
The DVX 24pA footage was shot for the behind the scenes footage to maybe include in the documentary, so the full tape was captured and we used DV Start/Stop detect to cut them up. I typically don’t do it this way, I will go back and just digitized the clips we need.
Another odd thing –
When I open the clip into the second FCP viewer and set my in and out points for the area I’d like to use. Then when I drag that section into the timeline, the in/out points are located about 30 seconds down the clip.Recapturing should do the trick. Thanks all for the advice.
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Very helpful, thank you for the explanation.
I will definitely continue to work that way in the future.
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