[brazen1]

Remember, Leia is in alpha/beta.  It's good we are noticing some quirky things and hopefully the dev(s) building Leia pick up on this feedback.  I don't mind that it's here limited and I don't know of a Leia thread for bug reports but it would be a good idea to start one elsewhere if one doesn't exist.  Usually that sort of thing is suggested to open up a ticket anyway.  Afaik, Leia should be introducing UHD compatibility and if so I'm sure that in itself is a challenge.  Without knowing anything about it, before a hardware solution from a GPU can be applied, the basics probably start with software decoding via a CPU.  Consider the dev may be limited to a device such as an NUC also where Intel processing and graphics are combined.  Perhaps this is the reason when you eliminate DXVA2 hardware decoding and thus switch to the CPU software decoding your judder straightens out?  Maybe Leia development has made it this far but not as far along to satisfy Nvidia users yet?  Unfortunately, that will eliminate many systems that were working previously.  So I would think that in time, hardware decoding for all GPU's would be developed as well.  I've heard reports that UHD was working for some using Leia.  I never got it to though.  Probably my hardware since pressing play on a title resulted in nothing and logs showed nothing.  I never pursued how others are using it.  I assume you are playing SDR?  If UHD, I'm interested in all the particulars.  After my revisit to Leia today and discovering HEVC x264 crashes, I'm pretty much in the dark.  Btw, no you're not losing out on anything playing software vs hardware as long as your CPU can handle it.