Why does Apple insist in 50Hz?

Discussion in 'Apple TV and Home Theater' started by Sheza, Apr 14, 2018.

  1. Sheza macrumors 68000

    Sheza

    Joined:
    Aug 14, 2010
    Location:
    Cambridge, UK
    #1
    So both at set-up and now after the TV updated itself overnight to tvOS 11.3, it said my region uses a different refresh rate and wanted me to change it.

    Problem is, that refresh rate (4K HDR 50Hz) causes bad motion effects on Netflix. Also, I'm pretty sure my TV is 60Hz (per https://www.displayspecifications.com/en/model/3051574) like basically everywhere in the world because we're not in the age of CRT anymore.

    So why does Apple think that 50Hz is better for me when my TV is apparently 60Hz and performance is actively worse in 50Hz?

    When I manually changed to 60Hz my TV didn't make a fuss, supported it fine. And the motion issues went away (presumably because it was doubling 30fps source video in Netflix to 60Hz).
     
  2. -Gonzo- macrumors 6502

    -Gonzo-

    Joined:
    Nov 14, 2015
    #2
    It’s not insisting as it gives you the choice, you can set it to whatever you like.
    Just set it and forget about it.
     
  3. steve23094 macrumors 68020

    steve23094

    Joined:
    Apr 23, 2013
    #3
  4. cynics macrumors G4

    Joined:
    Jan 8, 2012
    #4
    It defaults frequency (hertz) to the region you are in. This is done because a TV's frame rate capabilities aren't sent / reliably sent to set top boxes. Although they are rare anymore but sending 30/60 fps to a 50 hz display can be problematic. Its a safer bet to just use your regions broadcast format, which was initially based of the frequency of the mains power for a variety of reasons.
     
  5. danieleilertsen macrumors regular

    danieleilertsen

    Joined:
    Jun 1, 2016
    Location:
    Oslo, Norway
    #5
    Still,

    Stuff filmed in the US is 60 hz right? it does not get changed because of my region? Or does it?
     
  6. -Gonzo- macrumors 6502

    -Gonzo-

    Joined:
    Nov 14, 2015
    #6
    Stuff filmed in the US plays back at 24hz if Match Frame Rate is enabled.
     
  7. Anonymous Freak macrumors 603

    Anonymous Freak

    Joined:
    Dec 12, 2002
    Location:
    Cascadia
    #7
    Stuff filmed in the US is usually either 24 FPS or 30 FPS. Very little is produced at native 60 FPS.

    It stems from the fact that old standard-definition, as well as 1080 broadcast HD, are in 60 *interlaced* fields per second, producing a 30 complete-frame-refreshes per second. For fast-moving things, you get 60 updates, but with jagged interlaced lines. So lots of content was produced at 30 FPS, so that the alternating interlaced frames just add together to appear more like single 30 FPS full resolution frames.

    But much content, especially more "epic" content, like HBO series, or many of Netflix's series, are produced at a film-like 24 FPS; either by filming on actual film, or just digital at 24 FPS. (It also means fewer frames to produce CGI for.)

    60 interlaced frames per second have the benefit that 24 FPS can map directly to 60 interlaced frames to show "full resolution 24 FPS". (5:2 pulldown it's called.)

    Sadly, it means that neither 24 FPS nor 30 FPS translate nicely to Europe's 50 Hz.
     
  8. danieleilertsen macrumors regular

    danieleilertsen

    Joined:
    Jun 1, 2016
    Location:
    Oslo, Norway
    #8

    Thank you so much.

    Thats what I mean, you have to choose 60 hz, or go for match content. 50 hz is a no go
     

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