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green screen shakes and shivers

406 Views 5 Replies Latest reply: Nov 8, 2012 11:58 AM by jrllsls RSS
jrllsls Level 1 Level 1 (0 points)
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Nov 4, 2012 9:58 AM

Using the green screen filter, and slowing down my footage, I have very noticeable flickering on replay. Is there any way of eliminating this? Thanks.

Mac Pro, Mac OS X (10.6.8), 2 x 2.66 GHz Dual-Core Intel, 5GB
  • Jim Cookman Level 7 Level 7 (23,435 points)
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    Nov 5, 2012 6:45 AM (in response to jrllsls)

    When you slow down footage you are creating frames where there were none before.  I'd suggest you do this in a two step process:

    1. Slow down your footage and render it.  export selfcontained movie, do not recompress all frames.

    2. re-import the slowed down footage and apply green screen filter.

  • Michael Grenadier Level 6 Level 6 (19,800 points)
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    Nov 5, 2012 7:17 AM (in response to jrllsls)

    also, sending the clip with the slowdown applied to compressor and changing the blend mode to optical flow usually noticeably improves the quality of the speed change.  Not sure if this would have any impact on the quality of the key.   Probably a good idea to do a test.

  • RatVega™ Level 4 Level 4 (1,855 points)
    Currently Being Moderated
    Nov 5, 2012 4:52 PM (in response to jrllsls)

    I've had good luck down to 20-30% speed using Shake speed change in adaptive mode. The same basic capability is available in Motion and Compressor but it's called Optical Flow. It actually predicts and generates intermediate frames rather just duplicating.

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