[Dan Fredley]

There doesn’t seem to be much texture on the green screen to track, unfortunately. If there was something to track, the offscreen corners wouldn’t be much of an issue.

[Dan Fredley]

Do a search in Finder for file name “after shortcuts” and add the filter “System files” “are included”. The file you’re looking for should be “”Adobe After Effects 10.5 Shortcuts”–drop the txt extension. I’ve never used Mavericks before so I’m not sure what to tell you beyond that.

[Dan Fredley]

Here’s one way: Apply the Exposure effect and change the dropdown from “Master” to “Individual Channels” in order to adjust the channels separately. Press “Option/Alt+1” to match the red channel by adjusting just the red channel parameters in the Exposure effect panel. Then “Option/Alt+2” to match the green channel and “Option/Alt+3” to match the blue channel. It’s easier to match the grayscale values this way. To get back to the regular image just use the same key combination twice.

[Dan Fredley]

It would be a lot easier to export an alpha channel out of your editing program instead of black than to write a script for that. An expression can turn down the opacity of the layer by using sampleImage(), but it renders pretty slow.

This script might help to a certain degree:

https://aescripts.com/magnum-the-edit-detector/

[Dan Fredley]

Trial and error. It was just a lucky guess and it worked.

[Dan Fredley]

Is this what you’re talking about?

https://www.redefinery.com/ae/view.php?item=rd_Slicer

[Dan Fredley]

Try this:
//user-defined values
durInFrames = 20;
txt = 'Move45';
addValue = 45;

//AE-calculated values
m = marker.nearestKey(time);
str = m.comment;

if(str === txt && m.time <= time) {
start = m.time;
end = m.time + durInFrames*thisComp.frameDuration;
startValue = value;
endValue = value + addValue;
ease(time, start, end, startValue, endValue);
} else {
value;
}

[Dan Fredley]

It sounds like a motion blur problem — try turning it off for the layer. This happens usually because motion blur is turned off for the composition during RAM Preview, but turns on at render time when you select ‘Best Quality’.

[Dan Fredley]

You need to use a track matte. Think of it this way:

The lower third doesn’t actually move in, instead it is already there, but you have a separate rectangle shape that comes in and makes the lower third appear. You can just create a solid and animate it in from left to right. Place the solid above the lower third and choose “Alpha Matte” in the track matte dropdown.

[Dan Fredley]

Very cool, Dan. It’s good to know you can access some of these “non-pickwhipable” properties with their index number.