I need to play a movie with media_play and want the program to wait until the movie has finished before continuing with the next line of code.

Can someone tell me how to do that?

Fetch the movies handle when playing it and wait until media_playing returns zero for that handle:

http://www.conitec.net/beta/amedia_play.htm

http://www.conitec.net/beta/amedia_playing.htm