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Old 15th January 2019, 23:57   #4  |  Link
FranceBB
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Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
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I believe that x265 is more optimized for this kind of resolution, while x264 was fine-tuned for HD and later FULL HD.
Some of the useful tools available in x265 have been backported to x264, but still it's not as efficient as x265 for very high resolutions.
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