it was probably encoded at a time when they didn't do 4k av1 tests but only 1080p, but since then they also did a 4k one if you wanna test it [this video]
4K AV1 test video for checking decoder performance
Videos that are submitted in 60 FPS are only available in 60 FPS. It's getting more common as the cameras as getting cheaper. Check this for example, you should only have the choice between 60 FPS options. [this video] Videos that were submitted in 30 FPS remain as they were. It doesn't make sense to create new frames out of nothing indeed.
I just did some quick testing on my XPS 7390 2-in-1 (i7 1065G7) with Wayland: * Idle @ 50% brightness, WiFI on: 3.5W * mpv + hardware acceleration: 15W * Firefox + hardware acceleration: 19W * Firefox software decoding: 29W The test video was [this video] - which is 4k 60 FPS and got scaled to 1920x1080 for display.
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