16-core 3.5ghz computer from 2018 with 8gb GPU running software from 2020 vs 1-core 900mhz computer from 1999, no GPU, emulated at less than full speed, running software from 2002pic.twitter.com/0sbZJJHidm
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It's not possible to make scrubbing universally responsive in h.264 except post facto by caching the hell out of everything. Keyframe intervals can be arbitrarily long and smooth scrubbing requires being able to decode one whole GOP per screen frame.
At a typical GOP interval of 30, you need 30 times the CPU power required to decode a video normally for smooth scrubbing to arbitrary frames. GOPs can be even larger than that.
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the computer on the left is 500 times more powerful just in CPU than the computer on the right
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And h.264 is probably over 20 times more complex to decode than the older codec. Times 30 you're at 600. And nobody is putting exact seek into browser players because it's not going to work for HD video which multiplies the CPU usage again.
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