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Green Screen Flicker
I recently shot some footage against a green screen using a PD-150 and after keying the footage in after effects (using a dvmatte pro filter), the subsequent render now flickers around the edges whenever previewed on a tv monitor (and the problem is increased whenever the subject is moving).
Could this be something to do with the compression? or is it an after effects issue?
Hopefully you can help resolve this problem.
Thanks.
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2 Replies
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I also have the PD150 and whilst it does capture nice video, it is DV and thus has a small colorspace versus other formats.
To help when keying this type of footage, I have always found that the key is to try and keep the footage as clean as possible….by this, I mean keeping the footage in it’s native state as much as possible. Do not convert it to to QT or any other format….any proccessing will affect your final outcome.
Now, hopefully your lighting and every other element is ok…. Check to make sure that your composition settings match your footage (720×480) and that your fields on your footage are properly interpreted (lower field first in NTSC land). Also, Barend has an excellent tutorial on procedural matte creation, and Andrew Kramer’s DVD has excellent examples of keying using the keylight plugin.
Mark
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Combination of compression and noise.
Try adding ‘Remove Grain’ to the clip before applying a keyer. Enable ‘temporal filtering’ and lower that value (I think I usually use 0.3 or so).
Renders dead slow, but gives smoother edges.
Barend
Raamw3rk – digital storytelling and visual effects
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