It should be possible to create a 4k60 video with gops set up so it can be decoded as a 30 fps video by just skipping every other frame.
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I co-authored an Mpeg2 encoder a bit more than a decade ago which was capable of doing IBPBPBP...so oldschool mainstream really..
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Just did a quick PoC. Works fine, totally trivial to implement.https://gist.github.com/marcan/9e33fedbf1a5386378b7fa00cdcc0695 …
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Of course you'd actually want encoder support for constraining the output while allowing more flexible GOP structures, for efficiency.
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