Media Encoder CC17 Renders Rec2020 HEVC files with weird crushed black levels
OK, so I made a Composition in After Effects. To keep life simple, 32 bits/channel, No Color Management, No Linearize Working Space, No Blend Colors Using 1.0 Gamma, No Compensate for Scene-Referred Files, just a bog simple as I can make it.
I made a ramp using the built in tools, rendered it out using a preset for UHD 10 bit. So far so good:
Nice and clean ramps, all good.
Now I'll use the exact same setting, just turning on Rec2020 color primaries:
Note the upper ramp's blacks - from zero to about 8%, all values have been crushed to black, and then jump to about 23%. And yes, they play back this way too (checked on a Samsung KS8000, a UHD HDR UltraHD Premium Certified set, playing back via USB stick).
So, in summary:
- you CAN render 10 bit Rec709 files OK - so that's good.
-you CAN'T render 10 bit Rec2020 files and have them look right (unless everything is above 23% - BAD.
-if you look here https://forums.adobe.com/thread/2238092
...you'll see that you can't render proper HDR files as well, because they are rendering with something less than 7 bits instead of the 10 required.
Media Encoder is hence useless to make proper UHD HEVC files. I'm going to see what's possible with H.264, but it isn't as efficient by H.265 by a long shot.
-mike
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