So, when you convert the video codec you should learn your MP4 to use what kind of codec, and if other codecs not supported by iMovie like 4K UHD are applied to your MP4 files, you can't import them into iMovie for editing. You can use the following formats in iMovie: DV, HDV, AVCHD, Apple Intermediate Codec, Apple Animation Codec, Motion JPEG/A, iFrame, h.264, some, but not all, varieties of MP4, MOV. For example, what codecs are supported by iMovie? iMovie supports multiple video formats and allows you to create projects that are tailored to your specific video format. There is something you should know before solving iMovie won’t import MP4 problem. What matters is the codec inside the MP4 files. You can easily change it from one to another on your Mac. For a video editor like iMovie, the file format is not important.

IMovie supports MP4 files, but MP4 is a multimedia container format that contains various types of data encoded using one of several different codecs. If your MP4 file is not corrupt and the iMovie can import any other MP4 files except for the very one, the reason your iMovie won’t import MP4 is your MP4 file codec may not be compatible with iMovie. Guide List Part 1: Why iMovie Won’t Import MP4 Part 2: How to Add MP4 to iMovie Successfully Part 3: FAQs about iMovie Won’t Import MP4 Part 1: Why iMovie Won’t Import MP4įirst of all, you should make sure that your MP4 file is not corrupted, you can try using a media player to play that MP4 to check if it can be played normally.

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