Slow HandBrake conversion on 2011 i7?

Discussion in 'iMac' started by 88 King, Jul 5, 2011.

  1. 88 King, Jul 5, 2011
    Last edited: Jul 5, 2011

    88 King macrumors 6502

    88 King

    Joined:
    Jun 18, 2011
    Location:
    London, UK
    #1
    I'm currently converting some films to ipad format using HandBrake. The CPU is going full speed according to Active monitor at 720%, and istat menu is reporting 97% usage with all 8 threads.

    However, I'm only getting average 60 fps in handBrake. With my old i7 960 (3.2GHz) Windows 7 PC, I'm used to getting 80 to 100 fps at only 30% CPU usage. In fact I use to open 3 separate HandBrake conversions at the same time with higher fps than I'm getting now on the imac. :confused:

    I don't have Bootcamp installed at the moment so can't test HandBrake in Windows. Does everybody else also getting the same fps or are your's is much higher?

    Thanks

    Edit: I'm mainly converting from 720p films around 8 to 10 Gb.
     
  2. gmanist1000 macrumors 68030

    gmanist1000

    Joined:
    Sep 22, 2009
    #2
    I have the 3.4GHz i7 Model. Mine fluctuated between 80-150FPS, but occasionally it was below 80, and sometimes down to 60.
     
  3. Nanker/Phelge macrumors regular

    Joined:
    Dec 6, 2010
    #3
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

    It will depend on what you're encoding and what preset you're using.

    I can tell you that my 2.93 Nehalem i7 does 40 FPS from a Blu-ray MKV to an "Apple TV 2" preset...
     
  4. thebignewt macrumors regular

    Joined:
    Jun 10, 2011
  5. aliensporebomb macrumors 68000

    aliensporebomb

    Joined:
    Jun 19, 2005
    Location:
    Minneapolis, MN, USA, Urth
    #5
    Thinking...

    -How much memory do you have installed?
    -What does your machine geekbench? www.geekbench.ca and run the app.

    Curious.
     
  6. 88 King thread starter macrumors 6502

    88 King

    Joined:
    Jun 18, 2011
    Location:
    London, UK
    #6
    The video files does not have copyright protection, they all are ripped from DVDs.

    This imac with i7 @ 3.4 GHz and 8Gb of RAM gives geekbench score of 11300.

    My old Windows 7 PC with i7 960 @ 3.2 GHz and 6Gb of RAM @ 1600MHz gives geekbench score around 8500. With the CPU overclocked to 4.2 GHz and RAM @ 1400MHz, geekbench score was about same as my current imac.

    I'm going to swap the stock HD with a SSD today and install Bootcamp, first thing I'll do is to test HandBrake under Windows 7.
     

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