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jittery motion when editing to tape via blackmagic SD card
I have a situation that has me a bit perplexed, and I’m hoping one of you gurus can help. We will shoot DVCAM footage, capture into FCP (now at v5.03, but this occurred with earlier versions as well), and then export a quicktime movie (not using QuickTime conversion). I then bring the movie into After Effects, and do some compositing work, and render using Uncompressed 8 bit settings. I create a new sequence in FCP with matching settings (uncompressed 8 bit), and import the movie file I created in AE. Everything looks great on my computer monitor, but when I edit to tape, any moving objects (either effects or people in the video) jitter visibly when viewed on my broadcast monitor, and the resulting BetaSP tape. There are no unrendered sections of the sequence, and the the frame dominance is the same on the imported clip and the sequence.
I can apply the de-interlace filter in FCP, and that improves the image somewhat, but it’s still visible.
Any suggestions?
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5 Replies
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Sounds like somewhere within AE it is not rendering your fields. I use combustion much more than AE myself, but I do believe that there is a render setting that may be off a bit. Just a thought.
-Todd Beabout
Vazda Studios -
Would FCP still see the field dominance if that was the case?
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That’s what I’m not sure about. It seems that with you selecting the “Uncompressed 8-bit” codec that lower fields would be default, but I suppose it is possible that AE is adding fields to the rendered video even if it does not render those fields out. It might be rendering frames but then outputting fields. And I think I’ve just gone over my own head.
Sorry I don’t know more about AE. I know that in-house here we usually have our AE dept. send us QuickTimes with “Animation” codec. That is mainly because editors use different systems that aren’t codec-compatible, and it retains alpha. But unless in the case of a crawl or scroll on CG, the motion seems fine. Don’t know if that will help you, and it does require a render, but that’s all I’ve got. Good luck!
-Todd Beabout
Vazda Studios -
Try applying the stop motion filter with the following settings- Time lapse – 1; Steps-1; Initial opacity -100; Decay Opacity -100; Blend operator – Blend.
I’ve had some success in reducing jitters with this.
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It does sound like the fields are getting swapped around somewhere – maybe after effects is incorectly interpreting the footage your importing… I’ve seen it auto detect fields wrong before.
In Final Cut try adding the shift fields filter to your project, (it’s under video) try it at -1 and at +1. If that solves your problem then it’s definately a fields issue.
-Simmie
1 G5 – Cinewave
5 G4s – Cinewave
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