I've uploaded a 5K video to YouTube, but it doesn't show 5K in the view option (only 4K and below). What could be the issue?
5K video codec, FPS and resolution as shown by VLC (recorded by a GoPro 10):
YouTube displayed "Processing HD" at first:
Once done, the YouTube player only offers 4K and below:
I tried re-encoding the video through handbrake to downscale it to 5120x2880 and send it to YT at that resolution but that didn't work: still only 4k, no 5k on YouTube:
However, YouTube does support 5K, e.g. https://youtu.be/0aOREFhSafE is 5K: