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  • M1 v i7 on video conversion.

    From Alan Browne@21:1/5 to All on Thu Dec 16 11:31:15 2021
    A quickie test of the M1 v the i7 on a hard CPU job.

    i7: Quad Core (Hyper threading), 3.4 GHz - not using GPU.
    HD -> HB -> Ramdisk.

    M1: 8 core (4+4)
    SSD -> HB -> Ramdisk.

    Conversion: a 1.4 GB .MP4 h.264 1080p --- to ---> .MP4 h.265 720p

    Copied the presets from the i7 to the M1 Handbrake and checked all
    settings were the same.

    (HB is a universal binary for the M1; downloaded latest version for both
    Macs (1.4.2)).

    Because of the h.265 conversion this is hard on the i7 as it has no
    dedicated h/w for it. The M1 does.

    The files came out the same size, ... almost ... 2.5 kB difference
    (about 1/1000 of a percent v output file size). While all the settings
    were the same, there must some differences in the M1 and i7 handbrakes
    even though both were the same and latest version. Perhaps the h.265
    encoding in i7-version-s/w and the M1-h/w differ in some way.
    Or I missed some minor setting.

    Per the "intel Power gadget" the clock on the i7-3770 was in "Turbo" at
    ~3.6 GHz. (3.4 GHz normal, 3.9 "max Turbo"), so appears to have been
    slightly thermally limited in this run - no surprise given the loading).

    Results:
    i7: 32:17 s. 23.66 fps
    M1: 19:42 s. 38.77 fps - 64% faster.

    On the M1 all 8 cores are used by HB (all 4 performance and all 4
    efficiency cores) per iStat. 4 cores saturated, 4 not (I assume the
    "right 4" cores on the IStat display are the efficiency cores, they were
    at 100%).

    The GPU cores on the M1 were not used per iStat.

    There are only very limited GPU-model cases where HB uses the GPU and
    only on Windows and Linux.

    Not pleased with Handbrake for not taking advantage of the GPU cores on
    the M1. Future maybe. (It's mainly volunteers and very little funding
    so can't complain about $/performance too much).

    If I have time I'll try a render in DaVinci Resolve next.

    --
    Beginning in the 1970's, all birds in North America were replaced by
    drones made to look and act like birds. By 2004, no real birds are to
    be found. They are all drones. They all belong to the government.
    They spy on everyone. All of the time. Birds are not real.

    --- SoupGate-Win32 v1.05
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  • From Alan Browne@21:1/5 to Alan Browne on Thu Dec 16 11:34:07 2021
    On 2021-12-16 11:31, Alan Browne wrote:

    A quickie test of the M1 v the i7 on a hard CPU job.

    i7: Quad Core (Hyper threading), 3.4 GHz - not using GPU.
    HD -> HB -> Ramdisk.

    To be clear this is the 2012 iMac (27"). Forgot that in the post.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)