Quicktime 10 - export in original size, not 4k, 1080p, 720p etc? I do a lot of non full size screen recordings, e.g., they could be small such as 320x240 or in completely non-standard sizes and proportions like 1500x300. I want to save them using HEVC (rather than the default H.264).

In QTP HEVC is only available using File -> Export but that way I can only use a couple of standard dimensions (4k, 1080p, 720p and 480p).

How can I use both HEVC and a non-standard format in QTP10?
There is no way to export in any other sizes other than 4K, 1080P, 720P or 480P, according to this post here (it's in Mandarin, but I translated it) You could, however, export it in a higher resolution (such as 4K or 1080P) and then use another program to save it in your preferred recording.

Why do you need these strangely sized videos, by the way?