I don't have a deep dive, but I can confirm youtube has made things worse. I came across a copy of 『the TV show』 that I downloaded in 2009. 720p, H.264, 2460kbps. Looking again a couple weeks ago, it was 720p, VP9, 1300kbps. VP9 is more efficient but at half the bitrate it looks much worse.
Poking more, there's an AV1 version that's a little less bad at about the same bitrate, but it's still significantly worse than the old encode. There's also a new version of H.264 that's 2/3 the size of the old one. It's about as bad as the VP9 version but the artifacts focus on different parts of the image.
You'd think after 15 years of storage prices dropping, bandwidth prices cratering, and screens getting bigger, youtube might decide to maintain bitrates and let new codecs increase the quality of videos. Or split the difference between quality and savings. But nah, worse.
It doesn't make much sense to compare 720p to 720p like that. What matters is the bitrate. So the better question is - does youtube offer better quality video at a given bitrate constraint now in comparison to the past?
I am comparing the maximum quality available. I don't much care that today's 1300kbps video looks better than 2009's 1300kbps video. I care that they used to offer higher quality, and now they don't. I am not bitrate-limited, or at least my bitrate limit is higher than youtube would ever consider going.
What matters is the bitrate, and they're being overly stingy on bitrate.
Ok, this wasn't clear to me. Perhaps it was a video with too few views and thus not considered worth spending storage on? I mean, popular videos on youtube have up to 4K and pretty high bitrate.
seems more like gog/yt shifted bitrate/resolution downwards because pleps demand 4k, and now the "High Definition" version that was good enough for cinemas looks like crap.
Poking more, there's an AV1 version that's a little less bad at about the same bitrate, but it's still significantly worse than the old encode. There's also a new version of H.264 that's 2/3 the size of the old one. It's about as bad as the VP9 version but the artifacts focus on different parts of the image.
You'd think after 15 years of storage prices dropping, bandwidth prices cratering, and screens getting bigger, youtube might decide to maintain bitrates and let new codecs increase the quality of videos. Or split the difference between quality and savings. But nah, worse.