I have a bunch of video files (mp4). I need to insert some title information at the beginning and some credits at the end. I'm currently using iMovie.

Since the title could be extracted from the filename and the credits are always the same, I'm wondering how could I make all this process as automatic as possible.

I was thinking about Automator, but I'm open to any other solution. iMovie is the preferred tool so far, but I could use anything else (as far as it doesn't require additional licensing/cost).

Any idea?