Radeon Polaris - HEVC decoding?

Discussion in 'Mac Pro' started by Susurs, Feb 12, 2018.

  1. Susurs macrumors 6502a

    Susurs

    Joined:
    Jun 18, 2010
    #1
    Hi!
    Could anyone explain whether RX560 or any Polaris Radeon in a Mac Pro 4,1, or 5,1 with High Sierra installed could benefit to hardware accelerated HEVC decoding (As westmere CPU’s do not support it)?
     
  2. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    No by default (typical Apple style). The Hackintosh group seems figured out how to activate it, but I haven't seen a real Mac Pro user report success yet.
     
  3. bsbeamer macrumors 6502a

    Joined:
    Sep 19, 2012
    #3
    No positive reports from eGPU users at the moment either. Hopeful when "official" eGPU support is announced this may change, but nothing confirmed either way yet.
     
  4. Susurs thread starter macrumors 6502a

    Susurs

    Joined:
    Jun 18, 2010
    #4
    @ h9826790

    If I remember correctly, you said on some other thread in this forum that MP with W CPU is quite strong?

    Could you, please, let me know up to which hevc test file/bitrate your mac can play without stuttering.

    http://jell.yfish.us/

    I found that VLC 4.0.0 nightly build seemed to do well when I tested HEVC in a local store on some display m3 machines (well, the CPU supported HEVC, but anyway)...
     
  5. SoyCapitanSoyCapitan macrumors 68040

    SoyCapitanSoyCapitan

    Joined:
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    Geneva
    #5

    Depends on the video file. REC 709 color profile plays well, but REC 2020 color profile is still very jerky.
     
  6. itdk92 macrumors 6502

    itdk92

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    Nov 14, 2016
    Location:
    Copenhagen, Denmark
    #6
    I am up for testing this if you’d like.

    We have all kind of cards and Mac Pro configurations.
    --- Post Merged, Feb 12, 2018 ---
    How can I do that?
     
  7. h9826790 macrumors G4

    h9826790

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    Apr 3, 2014
    Location:
    Hong Kong
    #7
    jellyfish-250-mbps-4k-uhd-h264.mkv, H264 is definitely not an issue. Easy to play the highest bitrate sample. 280-420% CPU uasge.
    jellyfish-250-mbps-4k-uhd-h264.jpg
    jellyfish-110-mbps-hd-hevc.mkv, 8bit HEVC is also not at issue. Easy to play the highest bitrate sample. 180-280% CPU usage.
    jellyfish-110-mbps-hd-hevc.jpg
    However, for 10bit HEVC, it can only smoothly play up to jellyfish-120-mbps-4k-uhd-hevc-10bit.mkv. The initial 13s is quite demanding, and use very close to 1100% CPU (overall 600-1100%).
    jellyfish-120-mbps-4k-uhd-hevc-10bit.jpg
    Anything at or above jellyfish-140-mbps-4k-uhd-hevc-10bit.mkv, only the 2nd half may able to play smoothly. The 1st 13s is shuttering because running out of CPU power.
     
  8. Susurs thread starter macrumors 6502a

    Susurs

    Joined:
    Jun 18, 2010
    #8
    Thank’s a lot!

    Which Xeon W was it?

    That was IINA as far as I understand it.
    Have you tried VLC Nightlies (4.0.0)?
     
  9. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #9
    That's the W3690.

    Oh yeah, forget to mention that's all done by IINA (as you can see in the stat info). Just try VLC Nighty build 4.0, basically provide the same result.
     
  10. itdk92 macrumors 6502

    itdk92

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    Nov 14, 2016
    Location:
    Copenhagen, Denmark
    #10
    On a 12 Core 3.46GHz + RX 580 everything is smooth, also jellyfish-140-mbps-4k-uhd-hevc-10bit.mkv, although I see the rx580 kick more with the HEVC 10bit.

    Might be the difference in CPU though.

    On jellyfish-140-mbps-4k-uhd-hevc-10bit.mkv, CPU hovers at 800% and goes down as the clip progresses

    Tried on VLC 3.0
     
  11. Susurs thread starter macrumors 6502a

    Susurs

    Joined:
    Jun 18, 2010
    #11
    Thank you! Could you, please, tell me whether there are any Apple logo issues with the RX 580. It works OOB as I understand. Are there any other issues with this card? Which brand is it? Does HDMI work?
     
  12. Susurs thread starter macrumors 6502a

    Susurs

    Joined:
    Jun 18, 2010
    #12
    Anyone has an additional info with experience on Polaris GPUs?
     

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