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Sum Marker Values
I’m using the expression below on the Source Text stopwatch of a text layer display the marker text:
try{timeout = effect("Timeout (secs)")(1) + thisComp.frameDuration; alignBottom = effect("Align Bottom")("Checkbox");
nextTime = marker.nearestKey(time).time;
if(time>=nextTime) indx = marker.nearestKey(nextTime).index else indx = marker.nearestKey(nextTime).index -1;
if(indx>0) if(time < marker.key(indx).time+timeout) subtitle = marker.key(indx).comment else subtitle = "" else subtitle=""; if(alignBottom==true){if(subtitle.indexOf(String.fromCharCode(13))==-1) subtitle = String.fromCharCode(13) + subtitle;}} catch (e) { subtitle="Create markers with comments" }I will be using numbers as my marker text and want the text layer to display a cumulative sum of the value. If this can't be done only on the Source Text stopwatch of text layer, would it be possible to also use a Slider to assist with the counting process?
Thanks so much for your help. BTW, am I the only one that thinks Dan Ebberts needs a PayPal Donate button?
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8 Replies
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This expression should display the sum of all markers up to the current time:
total = 0;
n = marker.numKeys;
if (n > 0){
markerIdx = 1;
while((markerIdx <= n) && (marker.key(markerIdx).time <= time)){ newVal = parseFloat(marker.key(markerIdx).comment); if (! isNaN(newVal)) total += newVal; markerIdx++; } } total Dan -
If there were an After Effects Superhero…his name would be Dan Ebberts.
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This expression worked flawlessly.
I would like the markers to trigger an additional event. I need to have the opacity fade down about 30 frames before the marker and fade back up about 40 frames after the marker.
I know the marker fades are traditionally measured by milliseconds, frames would be preferred if possible.
-Andres
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I meant to be more specific…I should have specified the need to have control over when the fade-out begins and when the fade-in begins in relation to the marker. It will not be timed evenly on either side, i.e., the fade-out would probably begin more like 200 frames before the marker and the fade-in would begin about 60 frames after the marker.
Thanks again,
Andres -
Something like this, maybe:
fadeDownFrames = 30;
fadeUpFrames = 40;if (marker.numKeys > 0){
t = marker.nearestKey(time).time;
if (t > time){
linear(time,t-framesToTime(fadeDownFrames),t,100,0);
}else{
linear(time,t,t+framesToTime(fadeUpFrames),0,100);
}
}else{
value
}Dan
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This is good. The only thing it’s missing is a fadeWidth variable to control how many frames to hold the opacity at zero.
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So there’s 3 parts to this:
1. A fade out that lasts for 20 frames that begins -10 frames from the marker (or 10 frames before the marker)
2. hold the opacity at zero until 50 frames after the marker.
3. A fade in that lasts for 20 frames and begins 50 frames after the marker.
The expression below doesn’t exactly achieve this:
startOutDown = -10; // frames from marker
fadeOutFrames = 20; // duration of fade
startFadeUp = 50 // frames from marker
fadeUpFrames = 20; // duration of fadeif (marker.numKeys > 0){
t = marker.nearestKey(time).time;
if (t > time){
easeOut(time,t+startFadeOut+framesToTime(fadeOutFrames),t,100,0);
}else{
easeIn(time,t,t+startFadeUp+framesToTime(fadeUpFrames),0,100);
}
}else{
value
}This approach may be more robust:
1. A fade out that lasts for 20 frames that begins -10 frames from the marker (or 10 frames before the marker)
2. hold the opacity a specified number of frames, then begin a fade in that lasts for 20 frames.
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May be this is closer:
fadeOutBegin = 10; // frames before marker
fadeOutDur = 20; // duration of fade out
holdDur = 40; // duration of fade hold
fadeInDur = 20; // duration of fade inif (marker.numKeys > 0){
t = marker.nearestKey(time).time;
t1 = t – framesToTime(fadeOutBegin);
t2 = t1 + framesToTime(fadeOutDur);
t3 = t2 + framesToTime(holdDur);
t4 = t3 + framesToTime(fadeInDur);
if (time < t2){ ease(time,t1,t2,100,0); }else if (time < t3){ 0; }else{ ease(time,t3,t4,0,100) } }else{ value } Dan
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