Best sources to stream/download 4k video?

Discussion in 'iMac' started by ileff, Oct 29, 2015.

  1. ileff macrumors newbie

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    Jun 21, 2012
    #1
    Excited to fire up the new 27" 5k iMac tonight. What are the best sources to get video to view and/or demo?

    Youtube I imagine, where else?
     
  2. Wallabe macrumors 6502a

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    Mar 15, 2015
  3. ileff thread starter macrumors newbie

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    Jun 21, 2012
    #3
    how can i watch a 2160p youtube video 1x1 in chrome? full screen must get upscaled to 5k eh? theater mode looks like its smaller than 2160.
     
  4. ileff thread starter macrumors newbie

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    #4
  5. fathergll macrumors 6502a

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    #5

    Problem with youtube is the amount of compression going on though some things look decent IF its a proper 4k source and not some 1080 source that some donk uploaded as 4k.

    decent 4k transfers are going to be like 25GB files for movies(though they can go way higher in size).

    I personally haven't found any reliable place to view material in 4k yet that isn't highly compressed for streaming.
     
  6. Sirmausalot macrumors 6502a

    Sirmausalot

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    #6
  7. florinbss2 macrumors newbie

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    Oct 30, 2015
    #7
    This is a big problem. 4K movies are compressed with HEVC (h.265) that require high CPU power expander. Usually decompression makes video card, but video cards from AMD can not do decompression HEVC. The only tiles that do this are the NVIDIA GeForce 960 and 950. Today I was in a showroom Apple and put on USB stick some demos 4k HEVC at 60 FPS and simply could not core i5 them play. Play disruptions. So do not be excited about the new 4K Blu-ray format because it comes with HEVC codec and powerful processor will consume.
     
  8. ileff thread starter macrumors newbie

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    #8
    my i5 3.3-3.9 with m395 played the 4k/60 mp4 file mentioned in post 4 flawlessly
     
  9. florinbss2 macrumors newbie

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    Oct 30, 2015
    #9
    That is H.264 video file and can be decompressed video card
     
  10. Sirmausalot macrumors 6502a

    Sirmausalot

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    Sep 1, 2007
    #10
    Yes, Blu-ray on the iMac is a pain and UHD Blu-ray on the iMac is unlikely any time soon. However, the studios will hopefully offer 4K streaming or Digital Downloads soon.
     
  11. florinbss2, Oct 30, 2015
    Last edited: Oct 30, 2015

    florinbss2 macrumors newbie

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    Oct 30, 2015
    #11
    Yes, but 4k will be compressed all HEVC. And unfortunately no imac out so far can not decompress HEVC video stream through the video card. And the processor makes it very difficult. If the video has high bitrate, Core i5 will drown.
     
  12. Wallabe macrumors 6502a

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    Mar 15, 2015
    #12
    Real, proper 4K without any encoding, basically raw, unformatted quality is not the same as youtube 4K.

    I'm curious to see how the new iMac do with uncompressed 4K quality videos. And wonder if it's really 60 FPS, especially scenaries like action movies, not just some landscape shots with some flowers moving from the breeze, but with camera pan and a dynamic shot.
     
  13. h9826790 macrumors 604

    h9826790

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    Hong Kong
    #13
    The UHD video on YouTube is highly compressed, which unable to reflect the real 4K quality.

    The demos form here are better choices.
     
  14. cynics macrumors G3

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    Jan 8, 2012
    #14
    Were they playing from the USB stick? Which software decoder were they using?

    I have been able to encode h265 with a core i5 and have the i5 software decode it in real time without a problem. If the i5 is the problem you need to revisit your encoding methods. You can make any processor stumble if you make the decoding process too complex.
     

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