In fact quadrupling the number of pixels does not result necessarily in a 4x multiplication in bitrate, much less in general. That is because a movie recorded for example at 4K resolution is not at all the same as 4 different&#x2F;independent 1080p movies that you would stick together in the same 4K frame. There are correlations&#x2F;statistical properties that are exploited in the first case by the encoder and that does not exist in the second case. I have seen somewhere (though I can&#x27;t find the reference) a back of the enveloppe calculation using Fourier analysis that showed that to multiply by 4 the number of pixel you only needed to multiply by 2 the bitrate. So, if HEVC has 50% bitrate savings that would explain the claim that 4K HEVC could have the same bitrate as 1080p AVC. Of course there is much more happening in HEVC than just a Discrete Cosine Transform (motion compensation etc.) so I don&#x27;t know how this really applies in practice, and I haven&#x27;t done the tests myself...