iMovie Won't Import MP4 Files

For some reason iMovie '11 won't let me import videos. Specifically, I'm trying to add MP4 files that I copied to my hard drive from my GoPro HD 960. For GoPro users, I used the R2 (720p) format. They open properly in QuickTime and VLC but can't be imported into iMovie (or iPhoto). When I select File-->Import-->Movies and browse to the directory where I saved all the .mp4 files on my hard drive, they're all greyed out. And actually, it seems that just about no video files at all on my computer can be added (all greyed out)--even other MP4 files.


I downloaded MPEG Streamclip but that says "unrecognized file format" when I try opening the videos. I also installed Perian and rebooted.


In case it helps:

- I have an Intel MacBook running OS X 10.6.8 with iLife '11

- QuickTime info for the video format says "H.264, 1280 x 720, Millions; AAC, 2 channels, 48000 Hz"

- VLC says "Stream 0 (Video) - Codec: avc1" and "Stream 1 (Audio) - Codec: mp4a"


Any ideas? This is incredibly frustrating!

Posted on Apr 6, 2012 4:10 PM

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Posted on Sep 16, 2013 7:02 PM

I agreed, what you need to do is find a good video converting software to recorde the .mp4 video to iMovie supports formats such as MOV formats in this case, as fas as I know there are several freeware supports to converting videos of nearly any formats on Mac, FFmepg and Handbrake are all great, completely free and no other cost. Handbrake has both windows and Mac version. I have been using Handbrake to converting video for years.


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28 replies

Apr 17, 2015 10:43 AM in response to Macflustered

I have two video cameras


Oregon ATC9k and Panasonic HDC-SD9 AVCHD


I have used these for years successfully, I used them in January and February 2015 successfully and imported the movies from iphoto to imovie so that I could prepare a movie for loading to youtube and Vimeo. Worked fine.


Last night I tried to add more video to imovie so that I could modify the contents of the project file with extra video minutes.


I went round in circles but failed to get imovie to load the video.


Somebody at Apple has modified OSX latest version 10.10.3 and caused this function not to work!

When I first bought an imac in 2008 it was precisely because the imac would import Panasonic HDC-SD9 AVCHD video files!!

Feb 16, 2017 10:10 PM in response to drew879

Technically, iMovie does import MP4 video. However, iMovie only import MP4 files that are encoded with MPEG4/AAC or H.264/AAC data. And yet, MP4 is a video container format that may contain various audio and video codec (and sometimes even subtitle streams included). If the MP4 file is not encoded with iMovie support codec, iMovie will refuse to import this kind of MP4 video.

To solve can't import MP4 to iMovie, you may try the following method https://www.idealshare.net/mp4-imovie-solution.html

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iMovie Won't Import MP4 Files

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