Ok, I missed this one, and I just tried playing it in smplayer.
If I full screen it on my FHD monitor, I get 300 Frame dropped on output over the 52s, so 5 fps are dropped.
If I repeat the test on the 4k monitor I get 1750 frames dropped, so 33fps (original video seams to give 59.4 fps ).
If I watch the same video in 2K and set my 4k monitor resolution to 2k, I have no frame drop on this video with smplayer, but still a lot with firefox.
Maybe I misunderstood something, but freetube statistics shows a total of 4922 frames for the 52 seconds clip. 60FPS on 52’ would be actually 3120, but I guess there are some frames for signaliting or whatever.
But how can mpv drop 15k frames ? Are we maybe looking at different things ?