![]() ![]() ![]() From the figures you provided, I’d say your original video wasn’t produced using a profile equivalent to iMovie’s High setting. They just use different encoding profiles/levels, with varying bitrates. ![]() Lastly, I should point out that Low, Medium and High Quality settings all encode in H.264. I suggest you voice your concerns to Apple. In fact, in iMovie 10.0, 480p was still available, but as of iMovie 10.1, it’s gone. However this will still produce a video with 2.25× the number of pixels, so the resulting video may or may not still be larger.Īs to why you can’t output in 360p, this appears to be a design decision by Apple (possibly to steer us towards Final Cut Pro), because earlier versions of iMovie allowed more granularity. You'll want to output in 540p instead (960×540). This alone would account for a huge jump in storage size. 720p resolution is 1280×720, which equates to quadruple the number of pixels vs. ![]()
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