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The footage was shot without a greenscreen (as I'm still saving up for one) and I have completed a quick test shot. The test shot uses a background plate and above it, the footage of my actor running and jumping with his hands in the air. At the point he jumps, I drew a mask around his body and each frame, I moved the quad upwards and made small adjustments to the mask. This worked ok, but when rendered he shot into the air far too fast!
I want to be able to leave several frames "gap" between each quad movement upwards. This gives a problem where the take off footage isn't long enough i.e. the actor only stays in mid air with arms extended for less than a second. By trying to stretch out the timing a bit, the footage shows his returning to the ground and his arms coming back down.
Ideally, I want to be able to "snapshot" the frame where he takes off, then use that on subsequent frames to move him upwards. I've looked for ways of exporting as an image file and have even tried a 1 frame .avi export but I can't get it working (my footage is interlaced and I get problems with jagged lines).
Can anybody offer any advice on how best to accomplish this effect? Am I thinking on right lines to "freeze" the shot or is there a better way?
Thanks in advance!!