iMovie 4K resolution to Keynote - apparent loss of resolution

SuzuBell

macrumors newbie
Original poster
Aug 26, 2019
7
0
I exported a 4k resolution video from iMovie on my MacBookPro. I imported it into Keynote in order to crop it. I noticed that upon exporting from Keynote, the resolution of the video was markedly reduced.

In Keynote, I had exported the cropped video using File --> Export To --> Movie. Upon export, the resolution field only gave me "720p", "1080p", and "Custom". I clicked on "Custom". This gave me three "compression types" ("H.264", "Apple ProRes 422", and "Apple ProRes 4444"). I tried saving the cropped video using each of these three options. However, in each case, the video appeared to be reduced in quality (presumably resolution).

My question is: How can I crop a 4K video in Keynote and export it without reducing quality/resolution?
 

nicho

macrumors 68030
Feb 15, 2008
2,856
1,359
I exported a 4k resolution video from iMovie on my MacBookPro. I imported it into Keynote in order to crop it. I noticed that upon exporting from Keynote, the resolution of the video was markedly reduced.

In Keynote, I had exported the cropped video using File --> Export To --> Movie. Upon export, the resolution field only gave me "720p", "1080p", and "Custom". I clicked on "Custom". This gave me three "compression types" ("H.264", "Apple ProRes 422", and "Apple ProRes 4444"). I tried saving the cropped video using each of these three options. However, in each case, the video appeared to be reduced in quality (presumably resolution).

My question is: How can I crop a 4K video in Keynote and export it without reducing quality/resolution?
Why would you crop a video in keynote rather than doing it in imovie?


Also, you can't crop a video without reducing its resolution. You're literally removing pixels from the video.
 
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SuzuBell

macrumors newbie
Original poster
Aug 26, 2019
7
0
Thanks for the suggestion about cropping in iMovie. Unfortunately, it seems iMovie is restricted to cropping in only one size (16:9). I am uploading this video to Instagram, which supposedly works best (does least compression) for a 5:4 sized video.
 

nicho

macrumors 68030
Feb 15, 2008
2,856
1,359
Thanks for the suggestion about cropping in iMovie. Unfortunately, it seems iMovie is restricted to cropping in only one size (16:9). I am uploading this video to Instagram, which supposedly works best (does least compression) for a 5:4 sized video.
I see now! So your desired video file is still 2160p high, it's just not in a 16:9 ratio. In that case there's no need to be losing quality. Try using handbrake instead. https://handbrake.fr/docs/en/latest/advanced/resizing-video.html