Hi, I'm new to MacRumors, so I'm not sure how everything works. I've been looking all day on how to import m4v into iMovie, for some free converter or something (without a watermark). Then I thought of just changing the file extension name from .m4v to .mp4 and it worked! I'm now importing the movie into iMovie. I don't know if this is well known or not, but I've been looking all day and didn't find anything, so I hope I'm helping people out there. Thanks.