Editing 4K video on iMac is slow

Discussion in 'Digital Video' started by alstar, Oct 27, 2016.

  1. alstar macrumors newbie

    Joined:
    Jun 12, 2012
    #1
    Hi Guys,

    I am experiencing major issues while editing my 4K videos coming from my iphone 7 plus. I have a late 2012 imac with 16GB of Ram and a i7 Intel core proc but the lag when editing the clips in Final Cut pro x 10.2.0 is so bad that the frames drop.

    I am using an external thunderbolt drive to work out of but the issue is kinda bad, any suggestions?
     
  2. Gwendolini macrumors 6502

    Gwendolini

    Joined:
    Feb 5, 2015
    Location:
    random
    #2
    Are you using the original files, proxies or optimised media?

    And why have you not updated to 10.2.3 when there was still the chance?
     
  3. e1me5 macrumors regular

    e1me5

    Joined:
    Jun 11, 2013
    Location:
    Cyprus
    #3
    Does your iMac have an SSD or a traditional hard drive? And where do you store those videos?
    I have a 2012 i7 15" non-retina Macbook pro and I have no problem editing 4k videos of different formats.

    FCPX 10.3 was also released yesterday, it should perform even better with 4k now.
     
  4. joema2 macrumors 65816

    joema2

    Joined:
    Sep 3, 2013
    #4
    Editing H264 4K can be challenging on almost any machine and editing software. It is four times the data as 1080p, but your computer did not magically become four times as fast.

    The best solution is transcode those clips to proxy, which can be done during import or after import: https://support.apple.com/kb/PH12702?locale=en_US&viewlocale=en_US
     
  5. 3568378 Suspended

    3568378

    Joined:
    Dec 30, 2015
    Location:
    Orlando, FL
    #5
    What kind of hard drive is in your Mac? If it's a spindle drive or the slower fusion drive (or probably any fusion drive for that matter) I would say good luck. You might be able to work around that with an external SSD via Thunderbolt?
     
  6. sevoneone macrumors 6502

    Joined:
    May 16, 2010
    #6
    A single stream of 4k h.264 should not saturate an external HDD connected via Thunderbolt. If you making ProRes 422 optimized media it is probable. if it is a spinning disk you will want to use Proxy. Also, are you applying any sort of filters or processing to the video? If so, your gfx card and/or amount of video memory could be a bottleneck. What graphics chip and amount of video memory is in your iMac?
     
  7. northernmunky macrumors 6502a

    northernmunky

    Joined:
    Jan 19, 2007
    Location:
    London, Taipei
    #7
    Guys seriously, just tell the guy what he needs to know, theres nothing wrong with the hardware.

    Buddy, heres your answer. 4k natively will not playback at speed on a your machine, you need to edit using proxy files. That way you edit fast, by working with small managable file rather than the very large 4K footage natively.

    Assuming you are using FCPX then this is easy.

    More info here:
    https://support.apple.com/kb/PH12702?locale=en_GB&viewlocale=en_US
    And if you havent already done so make sure you create proxy media:

    [​IMG]

    And are using them (if you are set using 'original', then that is why your edit is slow):

    [​IMG]
     
  8. alstar thread starter macrumors newbie

    Joined:
    Jun 12, 2012
    #8
    Thanks this helps and yes I will use the proxy media capability of FCPx and it does make life better!
     

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