

MPEG-4 movies recorded with these devices may not be shown. If your camcorder has captured video footage in both formats, iMovie may only recognize the MPEG-2 movies when accessing the footage from the Camera Import window.

Some hybrid camcorders can capture video footage in both the MPEG-2 and MPEG-4 formats. So what's the matter? Well, this depends.

But the problem with MP4 is, when you plan to edit the MP4 file with iMovie, you may be able to do this but may be unable to. As a quite hot file extension, MP4 is widely used for saving media data and can be found in lots of places online or offline, which means, you may download MP4 videos from video sharing sites such as YouTube and Fox or shared some MP4 videos from others.
