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Phoronix Test Suite could be used for this easily enough. The software itself is open-source, and the test profiles used on OpenBenchmarking.org are on GitHub as well. Looking at the various video encoding test profiles, it looks like making your own would be pretty easy. Xiph has plenty of CC-BY lossless footage available for download, so one or more of those could be used for input (though I think only Sintel is available in 4K, and it's not full-frame but 4096x1774).
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