However the upscaling-downscaling is sure to lower your video quality by some token amount. How to Change Video Aspect Ratio in iMovie on Mac Part 1: Best Way to Change Video Aspect Ratio to More Than 16:9 As we said before, iMovie is far from the perfect tool for changing the aspect ratio.
If you still can’t keep your file size down encoding in 540p and using a lower profile, you can still down-sample it through Handbrake. So you’ll probably want to try Medium or even Low. 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. Facing problems when importing MP4 files to iMovie for editing If so, follow the simple tutorial, guanranteed to get MP4 and iMovie (iMovie 11/09/08) to play nicely. 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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