Apple neglected a very simple method in QTMovie, that it actually supported in NSMovie: isPlaying. It just returns whether or not the movie is currently playing.

Header File

@interface QTMovie (SimpleAccessorsAdditions)

• (BOOL)isPlaying;

@end

implementation file

@implementation QTMovie (SimpleAccessorsAdditions)

• (BOOL)isPlaying { return [self rate] != 0; }

@end