Adding Time offset to Marker expression

[macklad]

Hello guys,

I have below expression on time-remap property which triggers transition based on the markers set on Action layer.

Is it possible to add certain frames of pre-roll to this expression?

so if the maker is set at 1 sec the transition start at 0.5 sec.

I have added n=1 so that it skips first marker as it does not require transition.

I have already tried replacing 

 t = m.key(n).time-0.5; or t = m.nearestkey(time+0.5).index 

 which for some reason does not work.

Ae file attached if that help to understand my problem.

AE File 

m = thisComp.layer("Action").marker;
n = 1;
if (m.numKeys > 1){
n = m.nearestKey(time).index;
if (m.key(n).time > time) n--;
}
if (n > 1){
t = m.key(n).time;
time - t ;
}else
0 

[Mylenium · Accepted solution]

Chances are your add/ subtract messes with the nearestKey() logic in that some keys may "flip over" to the other side and then you get wrong results if they are less than a certain time apart.

Mylenium

[macklad]

Thank a lot man !!! that works ...removing 

if (m.key(n).time > time) n--;

get the job done for me.

Final expression here 

m = thisComp.layer("Action").marker;
n = 1;
if (m.numKeys > 1){
n = m.nearestKey(time).index;
}
if (n > 1){
t = m.key(n).time-.5;
time - t ;
}else
0