While I've used Macs for a long time (1998) I've never got into scriping. Yes, I know, very lame. I used to have lots of computers with different operating systems and got burned out on it. When I moved to Mac I just never touched scripts. But I have done lots of things with iMovie.
He says that he created a script to do what he needs but he doesn't list the script so I have nothing to go on. And what the first reply was trying to say passed mostly over my head into making me confused and lost.
Looking at the thread again, they maybe Automator scripts. I can struggle my way through an Apple script, but still haven't figured out Automator.
Here is an Apple link to Automator 101:
When I typed automator in the support page search box there were several things listed.