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by 0x457 924 days ago
Yes, key frames are fully encoded, and some delta frames are based on the previous frame (which could be keyframe or another delta frame). Some delta frames (b-frames) can be based on next frame instead of previous. That's why sometimes you could have a visual glitch and mess up the image until the next key frame.

I'd assume if each thread is working on its own key frame, it would be difficult to make b-frames work? Live content also probably makes it hard.