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| If you add a slider to the clip and use linear keyframes (important) to set the speeds (in percent), this time remapping expression should work: spd = effect("Slider Control")("Slider"); n = spd.numKeys; if (n > 0 && spd.key(1).time < time){ accum = spd.key(1).value*(spd.key(1).time - inPoint); for (i = 2; i <= n; i++){ if (spd.key(i).time > time) break; k1 = spd.key(i-1); k2 = spd.key(i); accum += (k1.value + k2.value)*(k2.time - k1.time)/2; } accum += (spd.value + spd.key(i-1).value)*(time - spd.key(i-1).time)/2; }else{ accum = spd.value*(time - inPoint); } value + accum/100 If you can't use linear keyframes, you're probably stuck with something like the slower method described here: http://www.motionscript.com/articles/speed-control.html#frame-by-frame Dan -----Original Message----- From: henry birdseye Sent: Sunday, January 06, 2013 2:27 PM To: After Effects Mail List Subject: Re: [AE] speed change expression Thanks, Jack, but that's the thing... I don't want to have to cut up the clips, just keyframe their varying speeds. On 1/6/2013 5:07 PM, Jack Tunnicliffe wrote: Not sure I'm understanding you completely, you can choose to just open time stretch and enter any percentage speed change. If this happens several times on the clip just cut it up and apply your new percentage to each clip. +---End of message---+ To unsubscribe send any message to <ae-list-off@media-motion.tv> |
