[noggin]

Just tested your video on 4 different players: Fire TV 4K Stick, Vero 4K+, nVidia Shield TV, and Odroid N2. All played the clip smoothly, w/o stutters (all my players are wired, playing over SMB or mounted shares), but only the Odroid N2 got my projector to engage HLG HDR mode. Colors looked great, while washed out as expected on the other players. I also have a couple of VP9 Profile 2 HLG videos and none of the players enable HLG HDR mode for them. Looks like only HEVC HLG works w/N2, not VP9.

I'm surprised why Fire TV 4K Stick won't engage HLG HDR mode w/local files via Kodi as both Smart YouTube TV and the new official YT app do.

BTW, what drone/camera combo do you have? Nice 4K PQ.

The colours are mostly washed out because it's Rec 2020 not Rec 709 gamut - rather than because it's HLG. (HLG displays pretty well if played with an SDR EOTF, it's one of the reasons it exists, but only if the playback is correctly triggering the display into Rec 2020)