Markers triggers layers

[Jean Livenais]

Hello,

Can you help me to build an expression where one layer shows up each time the playhead reaches its marker’s name and fades out when the playhead reaches the next marker with an 1s ease transition between each layer? The fade in and the fade out of 2 consecutive layers would occur simultaneously. You can see in the example, the layers can appear randomly one after another.

Thank you

MARKER-EXAMPLE.png 37 KB Image File — Click to view

• Copy Download Link

[Filip Vandueren]

Although it may need some extra logic if two consecutive markers have the same name, which they don’t in your example… Something like this:

m = thisComp.marker;
nk = m.nearestKey(time);
pki = nk.index - (nk.time > time && nk.index>1 ? 1: 0);
k = m.key(pki);
if (k.comment==thisLayer.name)	{
	linear(time,k.time,k.time+1,0,100);
} else if (pki>1 && m.key(pki-1).comment==thisLayer.name) {
	linear(time,k.time,k.time+1,100,0);
} else {
	0;
}

[Jean Livenais]

Thank you Filip, it works great.

Is there a way to start the transition before and end the transition after each marker, so that the marker is half way of each transition?

I tried to modify the code but it didn’t turn as wished.

[Filip Vandueren]

I think you only need to change line 2 into nk = m.nearestKey(time+0.5) ; but I haven’t tested.

[Jean Livenais]

I tried and the transition stay the same.

Maybe with some negative value with the posterize function.

Thanks