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> The more efficient a coded (perceived "quality" per bit), the more complicated the computations of decoding need to be.

That doesn’t have to be true. Only encoding is guaranteed to be more intensive.

What happens when more efficient encodings are developed though is usually not bitrate going down, but instead it is kept on the same rate to provide a higher image-resolution/quality for the resulting video.

And that means more pixels to render, and that means more work on the decoding end.



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