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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The problem isn't long videos, it's *short* videos. mpv by default uses non-exact seeks which are most efficient and will round your seek position to the nearest keyframe. But if your video is 8 seconds long like OP, you can only seek to one or two places. Try it with mpv.
With long videos, you can't tell that your scrubbing is only landing on seconds that are a multiple of 3. When your video is short, you can. This applies to mpv default settings too. You *can* ask mpv to do exact seeks, but then it'll eat CPU and run slowly for hi res videos.
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Hmm, you seem to be right. Consider me fooled, I thought it looked more granular than that at first.
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Keep in mind that some videos have fixed GOPs so keyframes are at exact intervals, and some don't, so you can't necessarily tell just by looking for patterns in the timestamps you can seek to.
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