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Expression to loop but trim last couple of frames?
I have about 200+ videos. Each needs to be looped X amount of times. I have an expression (see below) that allows me to do this and it works just fine for [most] videos. Unfortunately, some videos have a couple of frames of black at the tail end so when I loop them using the expression, those black frames get included therefore they flash every time the loop happens.
The only way I know to prevent this is to trim the black from the videos in FCPX and re-export them.
I’m wondering if there’s a better expression so I don’t have to trim and re-export in FCP.
I’m on a tight deadline :/
Thanks for any help!
nLoops = 100;
if (numKeys > 1){
loopDur = key(numKeys).time - key(1).time;
n = Math.floor((time - key(1).time)/loopDur);
if (n < nLoops){
t = (time - key(1).time)%loopDur;
valueAtTime(key(1).time + t);
}else{
valueAtTime(key(numKeys).time);
}
}else
value;Xavier
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4 Replies
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This is a time remapping expression, yes? One thing you could do would be to move the Current Time Indicator to the last good frame, and set a keyframe there, and then delete the last keyframe. Give that a try.
Dan
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Hi Dan,
Your solution works! Interesting though, It’s basically the same thing I was doing. The only difference is that I have to move the keyframe [before] I extend the layer. If I extend the layer first and then I move the keyframe, the black frames will show. I don’t understand why but Oh well! ¯\_(ツ)_/¯.
Thanks!.
Xavier
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You’re not actually moving the keyframe, right? You should be creating a new one a couple frames earlier than the last one then deleting the last one.
Dan
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Uhhhh… I actually was just moving the last keyframe and it works (so long as I do this first before I extend the layer)…
But I also tried (as you suggested) creating a new keyframe on the last good picture frame of the videos and this works as well.
I’m going to stick to your most recent advice.
Thanks so much!
Xavier
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