Isengard + HEVC / 4K displays and Ultra HD TVs with your Mac
#1
Lightbulb 
The question is, do you actually need HEVC Hardware decoding when you can just throw CPU cycles at the problem for 4K video at up to 30Hz ?

So...just been doing some testing on my old 4 core 2.7Ghz i5 iMac (Mid 2011) using ff-hevc software decoding and Kodi Isengard 15.2 RC2

2160p Tears of Steel (4096x1712) decodes and plays just fine even if it downscales and outputs at 1080p on my old iMac, due to my lack of a 4K TV.

Users with recent - mid level 4 core i5/i7 Macs should be able to software decode 4K video. Mini DisplayPort (Thunderboltâ„¢ Port Compatible) to HDMI adapters are available for max 3840x2160p output at up to 30Hz & 4096x2160p @24Hz on Macs lacking a HDMI connector.



Officially - video output at 4K, max 30Hz over HDMI 1.4 is supported by Apple.

Supported displays and configurations:
========================

You can use 4K displays and Ultra HD TVs with these Mac computers:
MacBook Pro (Retina, Late 2013 and later)
Mac Pro (Late 2013)
iMac (27-inch, Late 2013 and later)
Mac mini (Late 2014)
MacBook Air (Early 2015)
MacBook (Retina, 12-inch, Early 2015)

HDMI:
====
You can use 4K displays and Ultra HD TVs at the following resolutions and refresh rates when you connect them to the built-in HDMI port on your Mac:
3840x2160 at 30 Hz
4096x2160 at 24 Hz (mirroring is not supported at this resolution)

https://support.apple.com/en-au/HT202856

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