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HP and Dell disable HEVC support built into their laptops’ CPUs (arstechnica.com)
submitted 11 months ago by to c/technology@lemmy.world
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[–] 3 points 11 months ago* (2 children)

Yeah, because of the ASICs built into them to enable that decoding.

Without that, a 4K HEVC video is in upwards of 100+ billion operations/s to decode on the CPU. Which limits you to high end CPUs getting capped out on something you essentially get for "free" otherwise

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  • [–] 1 point 11 months ago (1 child)

    I meant without dedicated circuits, obviously. Can't it be parallelised? Many cpus have a lot of relatively idle cores at a given time...

    I remember that my 486 had trouble with mp3 files, but soon enough, I got a new machine with many more spare cycles.

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  • [–] 2 points 11 months ago

    That is parallelized... I didn't make mention of threading being the concern here.

    The 100+ billion operations per second isn't exactly easy.

    4k 60fps = 498 million pixels per second

    Each pixel takes a couple hundred logical operations with HEVC.

    A modern high end 4GHz, 8 physical core CPU at 4 instructions per cycle, at maximum capacity, can handle 128 billion operations per second.

    You probably wouldn't even get your realtime framerate in this scenario.

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