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Cadence Problems
I just had a few movies rejected by I-Tunes for cadence problems can someone please help? The movies are shot in HD and I receive a FCP final self contained movie. I than have to make it SD and deliver vis digi-beta. I choose Apple pro res 525 30fps and render the movie. I ‘m guessing that’s wrong. Can someone help me in this matter with my setting please. this is very new to me and need to lear on the fly ASAP.
Thanks,
Shawn -
7 Replies
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How did you remove pulldown?
Kevin Monahan
http://www.fcpworld.com
Author – Motion Graphics and Effects in Final Cut Pro -
Rejected by iTunes?
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Shawn,
When footage is shot at 24fps and then converted to 60i, it does this conversion using 3:2 pulldown (google it). Every 3 frames of 24p video is converted to 10 interlaced fields, and there is a specific pattern called cadence.
When you edit this footage in a 30fps sequence in final cut, you destroy that pattern and applications like Cinema Tools will not know how to convert it back to 24p.
Bad cadence makes video very difficult or impossible to deinterlace properly. Deinterlacing is essential for watching video on the web. Otherwise it looks like garbage.
Look at this trailer for Hancock on Apple:
https://www.apple.com/trailers/sony_pictures/hancock/Now look at the same trailer on IMDB:
https://www.imdb.com/video/imdb/vi2041708825/Notice how horrible the IMDB version looks. Apple doesn’t want their videos looking like that, hence the reason why they rejected yours.
The FCP manual does not warn of this even though tons of video cameras shoot 24p. And the vast majority of black-belt editors I know (as well as some of the floating heads you see above) do not understand this concept nor it’s importance. I’m always nagging people about this, so I feel a little more justified now.
If there was an easy answer to your problem, I’d tell you. You can check out JES Deinterlace (google for free download) which does inverse telecine with automatic cadence detection. This amazing feature could save your ass, but it doesn’t always catch them all. You may have to rebuild your project with 24p media on a 24p sequence.
FYI, there is a way to cheat. You can use JES or Compressor and convert it to 30p. Bad edits will be masked by line doubling. Unfortunately Digibeta doesn’t do 30p. Maybe you can deliver as a file?
Sean
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[Sean ONeil] “Unfortunately Digibeta doesn’t do 30p”
Well, no, but it will certainly do 30psf.
Shawn C, what format of HD do you receive?
Jeremy
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The footage is DVC pro HD? with the JES program we would convert there and then put on our FCP program and it should be fine? There is no way to render it in FCP?
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The footage is DVC pro HD? with the JES program we would convert there and then put on our FCP program and it should be fine? There is no way to render it in FCP?
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No, export your edited movie as a self-containted 1080i. Open it in JES and inverse telecine to 1080p 23.98 which creates a new QT file. You should save as ProRes HQ to preserve quality. Make sure “detect cadence breaks” is selected. When it’s done watch in Quicktime for interlacing artifacts. If you don’t see any then it worked. If you have fast cuts, it may not catch every scene change. If that happens, again there’s no easy answer. You may have to recapture your footage at 23.98 and rebuild the sequence. This is about as much as I can help you for free. You can always contact a large online finishing place that has a Teranex.
Sean
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