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Flickering at the top of the screen
Hi guys,
I keep getting some sort of crazy bug happening. The top black boarder of the video keeps randomly wobbling up and down. You can get rid of it by changing the speed of the part, then changing it back to 100%.
But, I then apply a load of filtering and a composit and it’s back with a vengeance. It’s for a montage, and completely takes away from the mood of the piece. I’ve tried loads of bouncing to try to sort the problem but if it fixes it at one stage of the process, i.e before the compositing, you can bet your arse it’s back again after it.
I thought about pulling the image in, so as to get rid of the top line, but this will diminish the quality! What’s a man to do?!
Has anyone encountered or worked through this problem?
many thanks,
Jack -
2 Replies
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I wasn’t sure if you mean field flicker, or that the whole top black area in widescreen mode is flickering?
Do you have a third-party slow mo plug-in filter in the flickering clips?
Some of them do cause flickering because they work their magic thru some field doubling techniques etc. If so, you need to apply FCP’s shift fields effect before the slow mo effect (at least that I can remember, the right order that is…). If you put them in wrong order, result might be really stuttering video, so you need to switch the order.
Also, vignetting effects can cause strange flickering with some plug-in slow motion effects. You need to put vignettes or other effects after the slow-mo effects, not before them.
What you’re describing is typical field related problem, that could come from badly executed effects. Also, old analogue video tapes (when digitized), might have some field flickering, I think…
If nothing else works (for some reason), you can set the picture scale to 101 in the Basic motion tab, so it zooms in 1%. This does degrade normal DV-size video a little, but it’s hardly noticeable I think. With HD formats that get converted down to 720 or SD, you can’t tell at all if few scan lines are missing from the top and bottom.
If you do not want to degrade the quality, you can always mask the video with a widescreen matte, and set the parameters so, that it just covers the flickering part, usually just one line is enough.
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Thank you Juha!
That all sounds like gold dust! I tried making a quicktime movie of the slowed down one, then adding the vignettes, filtering and defocus. It seemed to be the defocus that was causing the flickering. Then when I compositied that with the filtered part, it went nuts.
But, yeah, that shift fields thing sounds cool. Will give it a go.
Thanks so much for your post! 🙂
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