Quicktime Screen Recorder Movie Won't Import to iMove

iMovie says it doesn't support the movie.

What are the specs for the movie?

You need to update iMovie thru the Mac App Store.

Kind: QuitTime movie

Size: 3.15 GB on disk

Where: Desktop

Dimensions: 2880 x 1800

Codecs: H.264, AAC

Color profile: HD (1-1-1)

Duration: 22:31

Audio channels: 2

Encoding software: Mac OS X 10.10.3 (14D131)

What is the profile, level, fps, video data rate, and chroma subsampling? I don't normally play around wt multi-K resolutions, so I had to upscale a 2.5K file to your custom 1.60:1 2880x1800 dimensions. It ended up as a Main Profile @ L5.2 with VRF excursion of 4.0-60.0 fps for a 27.07 fps average screen capture and data rate I estimate to be only about 67% or yours but the file loaded normally to both iMovie v9.0.9 and v10.0.8 without problem. Just want to see how your file specs agree with MPEG-4 AVC standards. If encode looks normal and file opens/plays normally in both QT and third-party players but remains incompatible with iMovie, my best guess would likely be a corrupted file in the iMovie app package. If file has a problem with multiple QT apps but not third-party apps, then the problem might be a in the MOV file container.

I wish I knew how to tell you that. Where would I see that info?

I use the older v0.7.50 version of MediaInfo. E.g., here are the specs for the 1880x1800 upscaled video clip I made:

And these are the specs for the original screen recording before upscaling:

Unfortunately, I had to use QT 7 Pro to upscale which adds an additional layer codec settings. Would normally prefer to examine a sample problem file itself and test it on my own system in a known environment. Am basically trying to determine if there is anything obviously suspect about your file or whether it is more likely that your iMovie install is bad. For instance, you said that such movies imported correctly under Snow Leopard but did not indicate if the problem file will import to the older system or will import under Yosemite on a different platform if either/both options are available to you.

iMovie v. 10.0.8, released April 23, 2015?

[ I'm just double-checking because there was a known incompatibility with the earlier version of iMovie.]

What happens if you open the clip directly in QuickTime Player? Can you re-save it? Do you get a more descriptive error message?