No Apple 4K Content Download

According to Apple support, 4K video cannot be downloaded for offline viewing, regardless of your device - ‘You can download a copy of an HD movie to your iPhone, iPad, iPod touch, Mac, or PC, but you can't download a 4K version’.

Quite a shame since the 16” MacBook Pro sports a quality 3K [3072x1920] display and the 12.9” iPad Pro is not far behind with 2.7K [2732x2048]. Hell, even the 6.5” iPhone 11 Pro Max outpaces 1080p with a solid 2.6K [2688x1242].

iMac Pro 2017 Fan Noise

iMac Pro

2017, Xeon 18-core W-2195, Vega 64X, 64GB DDR4 2.6 GHz

Environment Peak Noise Level: 29 dB-A

Dual fans controlled manually with iStat Menus™ v 6.4 Measurement taken with iPhone XI Pro Max and Decibel : dB sound level meter™ v6.0.3 on iOS 13.4.5 Beta from 3’ away.

0% | 1100rpm | 29 dB-A

25% | 1450rpm | 30 dB-A

50% | 1800rpm | 32 dB-A

75% | 2150rpm | 37 dB-A

100% | 2500rpm | 41 dB-A

CPU only intensive tasks like Handbrake 1.3.1 peak all 18-cores at 100%, but even after 30 minutes of continuous rendering both fans are spinning at just 15% (barely audible). Peaking the GPU at 100% with heavy rendering such as exporting noise reduced BRAW in DaVinci Resolve 16.2 makes both fans kick up to 100% (loudly audible) in a matter of seconds. The Vega 64X has a TDP of 250W while the 18-core Intel W-2195 is only 140W, suggesting why the CPU needs less cooling at 100% than the GPU.

MacBook Pro

2019 16” i9 8-core, AMD 5500M results for comparison.

0% | 1750rpm | 29 dB-A

25% | 2700rpm | 30 dB-A

50% | 3600rpm | 34 dB-A

75% | 4500rpm | 40 dB-A

100% | 5400rpm | 43 dB-A

* MacBook Pro 16” is designed to spin each fan at a slightly different speed to cut down on cumulative noise of the same frequency. An average between each fan was taken to calculate rpm.

macOS 10.15.4 Stable release 19E266.

SMPTE ST 2086

SMPTE = The Society of Motion Picture Television Engineers

ST = Standard?

2086 = HDR static metada

"Mastering Display Color Volume Metadata Supporting High Luminance and Wide Color Gamut Images" describes static data such as MaxFALL (Maximum Frame Average Light Level) and MaxCLL (Maximum Content Light Level). 

MaxCLL = Maximum Content Light Level - the value in nits of the brightest pixel in the entire clip.

MaxFALL = Maximum Frame Average Luminance Level - value in nits of any single frame. MaxFALL is generally smaller than MaxCLL, and is a parameter used by the display to prevent damage if a frame exceeds its safe handling capability — OLED pixels, for example, can burn out if run at maximum intensity for a long period of time.

example file: The Grand Tour - Seamen

Color range: Limited

Color primaries: BT. 2020

Transfer characteristics: PQ

Matrix coefficients: BT. 2020 non-constant

Mastering display color primaries: Display P3

Mastering display luminance - min: 0.0001 cd/m2, max: 1000 cd/m2

Maximum Content Light Level: 999 cd/m2

Maximum Frame-Average Light Level: 215 cd/m2

Codec configuration box: hvcC

HDR Format: SMPTE ST 2094 App 4, Version 0 (HDR10+)