OK, thanks for the replies.
I ordered the LG UP870, as it's the cheapest standalone I could find (just over $100 USD here) and a different brand from either LowDead's or jdobbs' machines.
Yeah, I obviously don't know what I'm doing when reencoding, so I'm going to have to put some work into it. I had skimmed through that whitepaper and not even made a mental note of the allowable framerates.
I did find out that I can pass the uhd-bd flag to x265 via Handbrake in the "extra options" field, but I then also realized that 8-bit color is not UHD-BD compatible either:
Code:
x265 [error]: uhd-bd: bit depth, chroma subsample, source picture type must be 10, 4:2:0, progressive
So obviously I have lots more research to do to get up to speed on this. If anyone has links for noobs to try to learn x265 CLI and/or downloadable and copyright-free non-HDR 10-bit UHD video clips, that would be appreciated too.