I created an animated horizontal line (which widens outwards from the middle).
Here it how it looks with a black background:
To do this:
A. In SC, I put a white colour clip on V2. I made it 10 seconds long
B. I used Size/ Position filter to make it 8 pixels high and 1920 pixels wide (full width), positioned half-way down the screen, then I animated it using Size /Position keyframes so it begins in the centre and widens out to full width.
Use these coordinates:
Start: Position: 960*, 540**; Size: 0, 8
End: Position: 0, 540; Size: 1920, 8
NB *960 is half of 1920 (full width in HD), **540 is half of 1080 (full height in HD).
Make the animation short - ie less than 1 second.
C. I exported the animation as a Quicktime Animation (.mov). (Tip : colour clip on V2, make sure there is no clip on V1). The background will look black in the preview but when exported will turn out transparent.
How to use it:
Importing the .mov file to the timeline and applying a Size/Position filter to the clip (make sure it’s set to “distort”) allows you to instantly make it any width by dragging the boundary box widthways - and also by dragging the boundary box in a vertical direction it allows you to make the line quite narrow.
I used it in the following sample video title: