Relevancy of T2 HEVC encoding

Discussion in 'iMac' started by whosthis, Jul 15, 2019.

  1. whosthis macrumors member

    Joined:
    Aug 21, 2008
    #1
    I know the hardware support through the T2 chip for h.265 shows up in benchmarks pretty well.

    As I am currently not into producing videos at the moment (but that might change, of course), I wonder how big of a deal that really is, or how much you'll be missing without. I am not talking about someone who is going to transcode his complete movie collection, or who uploads his whole live on youtube.

    As I understood it, the T2 will only be beneficial for encoding to h.265 - not of much use for decoding?

    When producing videos, wouldn't that be just the last step when finishing of the whole project?

    If this is only done once per video, then I can easily wait for it or make a cup of tea or walk the dog. :) Has someone some numbers of how long encoding takes, i.e. a 10 minutes video of 1080 or 4k? All the benchmarks usually tend to tell *what* they actually do.

    Just trying to figure out how much I'm losing without a T2.

    Thank you. :)
     
  2. priitv8 macrumors 68040

    Joined:
    Jan 13, 2011
    Location:
    Estonia
    #2
    Isn't it only relevant to Intel Xeons?
    All late i5/7/9 CPUs have hardware H.265 encoder onboard (Intel QuickSync), so the T2 would not bring that much to the table.
    So far Apple's VideoToolbox does only 8-bit H.265 encodes, so 10-bit and HDR are still handled in software, although Coffee Lake has necessary hardware.
     
  3. whosthis thread starter macrumors member

    Joined:
    Aug 21, 2008
    #3
    Benchmarks show big improvements with T2 for H.265. But I've never been into video en-/transcoding so far (well, except ripping some videos many years ago).

    But if it's a "once-per-video" gain, well, then I really couldn't care less about the speed up, and I wouldn't second-guess going with the last T2-free Mac.
     
  4. Zdigital2015 macrumors 68000

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    Jul 14, 2015
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    East Coast, United States
    #4
    This video - - and this video - and this one - and finally, this one - - may prove useful to your questions.
     
  5. priitv8 macrumors 68040

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    Jan 13, 2011
    Location:
    Estonia
    #5
    The difference between hardware accelerated and CPU-only encode can be such, that even for a once-per-video speed gain, you'd want to have it accelerated.
    On my current i9 when I encode 10-bit HEVC in HDR10, it takes 9 hours to encode a 15-minute-timeline.
    Doing it in hardware-accelerated 8-bit mode decreases this time to 10 minutes...
    AVC/H.264 is naturally less taxing on the encode side than HEVC/H.265
    But a 9-hour coffee-break is a tad too long for me :)
     
  6. Trusteft macrumors 6502a

    Trusteft

    Joined:
    Nov 5, 2014
    #6
    9 hours? Are you sure it's normal?
     
  7. whosthis thread starter macrumors member

    Joined:
    Aug 21, 2008
    #7
    Thanks for the comments and links, some of which I had seen but rewatched.

    So bottom line is: base MBP is good enough. i9 beats them all. iMP rules them all. So whatever you pick, you have the best one. :p

    If you watch a lot of these videos, you cannot help but think that we are living in a huge bubble... people benchmarking videos on youtube for people doing videos on youtube...

    Anyway, finally placed my order today. It was a really hard decision, and probably the one with the most doubts in my history of Mac-buying.
     
  8. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #8
    That's a typical time for H.265 compression in software.
     
  9. whosthis thread starter macrumors member

    Joined:
    Aug 21, 2008
    #9
    Well, I think if I do come up with some instructional consumer camera filmed YouTube video in the next years, I will just skip the "10-bit HEVC in HDR10" button then. :)
     
  10. priitv8 macrumors 68040

    Joined:
    Jan 13, 2011
    Location:
    Estonia
    #10
    I think in this day and age of 4K HDR screens, one wants to capture your hobby movie on a consumer camera, using log gamma and exporting it into HDR10. The added oomph is the same as for Hollywood movies.
     

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9 July 15, 2019