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photo jpeg frame rate differs in quicktime and fcp
I’ve posted this problem in the Apple forum as well, so my apologies if you’ve been through it already.
I’m working in fcp 6.0.3.
I’m working in a 1920×1080 ProRes 422 project at 23.98 fps. We’re receiving Photo JPEG files from Europe via ftp at half resolution (960×540) for review and approval. The files are playing back at 24 fps when opened in Quicktime. Upon importing into my project, the frame rate switches to 30.97. If I open the clip into the viewer, it will play back and some of the clips then go black at the end. Some of the clips will have one flash frame of white before going to black, others just go to black (this is just in the viewer). It seems to make mathematical sense – that is, a 1 second clip will have 6 or 7 frames of black which would account for the 30 or 31 frames of the 1 second clip with a frame rate of 30.97. But other sense, it does not make.
If I drop the 30.97 clip into a 23.98 sequence, these black frames don’t appear. (Also, the black frames do not appear when playing back in the quicktime player)
Is this an issue with the original file export, an issue with how quicktime calculates fps or is this a final cut pro bug?
I tried creating a photo jpeg fcp project with resolution set to 960×540 and 23.98 fps. The clips still import as 30.97 fps.
I tried exporting the 30.97 fps clip from the viewer as 1920×1080 ProRes 422 clip at 23.98. This results in a clip with jerky playback (from the frame rate conversion, I’m assuming) and the black frames I mentioned are included.
As a temporary fix, we’re dropping these photo jpeg files directly into the timeline (which appears to somehow jostle them into the 24 fps mode seen by quicktime) and rendering out.
Would still like to get to the bottom of this kooky frame rate issue. Any ideas?
Thanks in advance.
jack
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