Latest post Mon, Dec 19 2016 12:57 PM by mjolnarn. 10 replies.
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  • Wed, Dec 14 2016 1:33 PM

    • BenQ
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    Transcoding speed

    Hey there

    I have a question about usage of multi-core cpus in MC 8.
    I mainly edit Full HD and I just did the jump from an XW8600 to a Z840 (see specs).
    Coming from 8 cores going to 20 cores (40 with ht) and guess what - render time is almost the same.

    In task manager it seems as if only 1 core would be highly active. Even when I add a background transcoding the cpu-load does not go over 14 percent. This is a fully supported machine configuered with Config Guide Rev D and it is getting bored to death I fear.

    Is there anything I could do about it? I transcode Qt coming from a Nikon DSLR and it doesn't matter to which format I transcode. DNxHD185X or lower or DNxLR...

    Thank you for your help.

    Benjamin

    HP Z840 2xE5-2660v3 10C@2,6 Quadro M4000 8x8GB Ram Windows 7 64pro MC 8.5.3 MOJO DX HP XW8600 2x3GhzQuad 16GB QuadroFx3700 Windows 7 64pro... [view my complete system specs]
  • Wed, Dec 14 2016 2:15 PM In reply to

    • Vilem
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    Re: Transcoding speed

    I'm afraid that this is a problem in the base of the MC, which uses QuickTime as the basis for the playback and encoding MOV, MP4 ...
    QT is, for Windows, only the 32-bit version (in addition without support!), So Avid can not, in the container and codecs dependent QT fully exploit the power of the PC.


    So the main question is when will on the part of Avid, an end to dependence on the QT?

    V.

    AVID MC2020.08, HP Z620 - 2 x Intel Xeon E5-2620, Quadro P2000 - driver 442.50, RAM 48GB - DDR3, BM Intensity Pro 4k - 10.11, W10 - 64bit Professional... [view my complete system specs]
  • Wed, Dec 14 2016 2:24 PM In reply to

    • mjolnarn
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    Re: Transcoding speed

    Foreground transcode of Avchd to DNx is around 25 % of realtime with 12 x 95 % Cpu usage appr

    BG transcode is broke re the speed ( since many versions back , around rt or maybe even more ) and around the same Cpu usage as you see

    Systems specs as below , I´ve reintroduced coffeebreaks and fg transcode as in the " old " days , bg render runs fine

    Mac: 17" Macbook Pro i7 2,66 ghz with 8Gb Ram, 500gb 7200rpm drive___ PC_NEW Win10 Pro Mbo Asus Rampage IV Black CPU Ivy Bridge-E 4960X ( = 12 x 4... [view my complete system specs]

    Tomas 

     

  • Wed, Dec 14 2016 3:13 PM In reply to

    • DStone
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    • Moderator: Avid Media Composer for Liquid
      Moderator: MCA Mac
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    Re: Transcoding speed

    You might want to take a look at this thread HERE. It's a discussion by another user on a new high-end build.

    In short, it's dependent on whether or not you're using an AMA plug-in or not, and if you are whether or not that plug-in supports multi-threading or multi-processing for rendering. For MC internal transcodes, it does not appear that MC makes heavy use of either threading or MP for rendering (my opinion only, based on emperical evidence). It also makes a difference if the plug-in uses GPU processing (which is inherently multi-processing), in which case the video card is the limiting factor.

     

    DIY quad core I7-4790K, 32Gb, NVidia RTX 2060 Super 8, Win 10 Pro, MC (generally the latest or the one just before) [view my complete system specs]

    Dave S.

  • Sat, Dec 17 2016 7:14 AM In reply to

    • luca.mg
    • Top 25 Contributor
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    Re: Transcoding speed

    Can't speak for CPU usage, since Avid is very unclear about the MC internals, but for sure, even on the fastest workstation, rendering/consolidating/transcoding times hit the hard drive wall: indipendently of CPU usage those operations can't go any faster than the write speed of the hard disks involved, so even if the OP replaced the old workstation with a new one twice as fast, but render time is almost the same, the limiting factor is the hard drives performance.

    Symphony 20.06, BM Intensity Pro 4k, Windows 10, i7-5930K, 32 GB ram, Quadro K620 [view my complete system specs]

    peace luca

  • Mon, Dec 19 2016 10:15 AM In reply to

    • BenQ
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    Re: Transcoding speed

    Thanx for your replies. I know that multi-thread has never been the strongest part of Avid since I am editing for 20 years now on MC. But I thought on my own experience that there had been some progress.

    The things is: when I render or transcode on my old XW8600 the cpu-usage goes up on all cores, one seems to do most of the work but the others are also busy and I get an overall cpu-load of 45 to 50 percent.

    Oh how nice this would be with 20 cores. But on the Z 840 it's between 5 and 9 percent. Some cores do nothing, some have very little activity. I wonder if it has something to do with turbo-management which seems to be able to direct the work to one special core. I will switch that off for a test.


    I am sure that disk-speed has nothing to do with it. Because I tested it with transcoding/ rendering to an internal SSD and we are talking DNxHD185 here.
    It is not much faster than real-time.

    So at the moment upgrading the machine means 6k for a little less fan noise and a little more responsiveness to me. The XW8600 was (back in the days with MC 6.5) exactly as fast and responsive with HD as the new one now. Awesome...

    HP Z840 2xE5-2660v3 10C@2,6 Quadro M4000 8x8GB Ram Windows 7 64pro MC 8.5.3 MOJO DX HP XW8600 2x3GhzQuad 16GB QuadroFx3700 Windows 7 64pro... [view my complete system specs]
  • Mon, Dec 19 2016 10:29 AM In reply to

    • mjolnarn
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    Re: Transcoding speed

    Please send me a link to a card, if possible, and I´ll tell you what I see

    Mac: 17" Macbook Pro i7 2,66 ghz with 8Gb Ram, 500gb 7200rpm drive___ PC_NEW Win10 Pro Mbo Asus Rampage IV Black CPU Ivy Bridge-E 4960X ( = 12 x 4... [view my complete system specs]

    Tomas 

     

  • Mon, Dec 19 2016 11:16 AM In reply to

    • BenQ
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    Re: Transcoding speed

    Hi Tomas

    thank you for your help.

    Here are two links. 1st one without additional background rendering, 2nd one with.

    https://www.dropbox.com/s/i74rsk0td5t385r/Qz840.jpg?dl=0

    https://www.dropbox.com/s/jco1xkspbr7srvn/Qz840wBG.jpg?dl=0

    At least for rendering effects in DNxHD I've got better news. All cores around 25 percent and render is pretty fast.

    So maybe it is really the AMA plug in?

    best

    Benjamin

    HP Z840 2xE5-2660v3 10C@2,6 Quadro M4000 8x8GB Ram Windows 7 64pro MC 8.5.3 MOJO DX HP XW8600 2x3GhzQuad 16GB QuadroFx3700 Windows 7 64pro... [view my complete system specs]
  • Mon, Dec 19 2016 12:25 PM In reply to

    • mjolnarn
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    Re: Transcoding speed

    Hi benjamin , it says one meg for one download, is that really an untouched camera card cause that´s what I need to test and help.

    Mac: 17" Macbook Pro i7 2,66 ghz with 8Gb Ram, 500gb 7200rpm drive___ PC_NEW Win10 Pro Mbo Asus Rampage IV Black CPU Ivy Bridge-E 4960X ( = 12 x 4... [view my complete system specs]

    Tomas 

     

  • Mon, Dec 19 2016 12:53 PM In reply to

    • BenQ
    • Not Ranked
    • Joined on Tue, Jul 8 2008
    • Berlin
    • Posts 36
    • Points 540

    Re: Transcoding speed

    Hi Tomas

    oops, sorry, got you wrong. These are just screenshots from what is happening in the taskmanager.
    The cards I have are much too big to upload. I could send you a single file though.

    best

    Benjamin

    HP Z840 2xE5-2660v3 10C@2,6 Quadro M4000 8x8GB Ram Windows 7 64pro MC 8.5.3 MOJO DX HP XW8600 2x3GhzQuad 16GB QuadroFx3700 Windows 7 64pro... [view my complete system specs]
  • Mon, Dec 19 2016 12:57 PM In reply to

    • mjolnarn
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    • Joined on Wed, Feb 8 2006
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    Re: Transcoding speed

    Ok, or just shoot some small files for tests .

    But one single file will do well

    Mac: 17" Macbook Pro i7 2,66 ghz with 8Gb Ram, 500gb 7200rpm drive___ PC_NEW Win10 Pro Mbo Asus Rampage IV Black CPU Ivy Bridge-E 4960X ( = 12 x 4... [view my complete system specs]

    Tomas 

     

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