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I've also observed this myself; the other day I DLed a BBC-made 30min documentary off their official YT account (videoID=Pxozxj03l18) and though I initially wanted the 720p25 variant (in h264), I went, in the end, for the 1080p25 one (h264, ca. 1600kbps), because 720p25 was a measly 500kbps ... ... They're probably targeting ChromeOS laptops and/or Android-based UHD SmartTVs; little do they care for "legacy" OS/HW setups; and h264 still costs them patent fees, whereas their own VP9 codec (and av01) is royalty-free...

YouTube has something new on their end again. No mention of SABR at all anymore. There is new line in the app that says "Sleeping for 5 seconds as required by the site." No big deal about that. Requesting 720p or 1080p h.264 video gives extremely poor quality compared to how it was before. The bitrates for a talking head segment are 240 kbit/s and 860 kbit/s respectively. Requesting no/default format gives VP9 in extremely large size and demand for the computer. Best that they have 3840*2160 @ 30 fps, 9500 kbit/s. Google really wants to push their VP9. When nothing works, this still does.

...It wasn't working for him, but now it is : PS: The forum software doesn't send a second (e-mail) notification to thread-subscribed members after one has edited one's original post (for which an initial notification has already been sent) ... Browser profile corruption is always a possibility, so, as others have noted, regular profile back-up and back-up of important info on physical copies is always strongly recommended ... ... Probably NOT ...