I have seen your post. My analysis says this is impossible issue and time lost subject. At first, you answer me why you replace footage.
You will need to write a script that replaces the footage and sets the in- and outpoints. Though it is admittedly in no way clear how you even plan to define those points. The actual info would alredy have to be stored somewhere in the file and that process by all means has always been limited and unreliable. So rather than trying to force things that may not work, it might be smarter to adapt to how AE works and use pre-comps, so stuff can be replaced and trimmed inside the pre-comp without affecting the keyframed parent comp.
For example there are two placeholder, so two solids and they slide over the screen, delayed to each other and with a quick stop.
After replacing you have two different clips, for example city in daylight and city in moonshine sliding over the screen.
All with mask or alpha. So that you can see two from the clips, sometimes also side by side and so on.
But the clip sun is for example interesting after 10 seconds and then just for 15 seconds. The rest ist shaky and not useable or just not intresting, same than for the moon but after 12 seconds an then for 20 seconds.
That with the precomps is not so bad from the idea, but if i have to replace a lot of clips, it´s better to replace in a row and not to open every single placeholder comp. But in fact that maybe would solve the problem, even if its against a chill workaround.
Any other Ideas, cause script sounds a bit like there will be to many bugs or too complex to write for each situation.
1 person found this helpful
BUT not the entire real footage clip, i just want to have the clip start at a certain time, so with an in point and end after a certain time, so with an out point.
1. replace the footage with the placeholder as usual
2. activate the slip edit function for the layer by hitting Y. make sure your keyframes are not selected. now you can move the source video inside a given in and out points
if you want, you can also do this by clicking twice on the layer in the timeline and opening the layer window. you can then drag the clip by clicking in the middle of the bar and moving it.
more information here: Selecting and arranging layers in After Effects
Roel's advice here is exactly what you need.
Yes, i think this should work.
So double click, next step enter numeric preview time, make there a in point push the clip with the middle bar to the beginning again - voila.