HEVC / H265 with Alpha Support in AME

Doesn't work for me. Input is ProRes 4444XQ with alpha, plays fine everywhere, but Export to H265 removes the alpha channel even when "preserve transparency" is ticked.

I can confirm that encoding via finder works but there are limitted options:

• Resolution can't be manual, must be FHD or UHD
• Can't control quality
• No progress bar or queue
• No controls for frame rate or audio

You can follow along in activity monitor but all it really tells you is that the encoding process is active and it only uses the CPU, which is a damn shame. 

If you select multiple videos and right click to encode, it will convert all of them - but one at a time, and you cannot track progress at all. 

For my test I did a 20 second video, conversion from APR4444+A. The video was just animation of a grid in AE. It took 2 minuts to render, To convert it took 6 minutes for that same file. So it's VERY slow. The codec extension is .mov. 

The size of the file went from 250 MB to 2 MB and the frame rate defaults to the target video. So that's great. 

After Effects and Premiere does not recognize the alpha channel, so this codec really only works as a delivery codec - not a storage codec or editable codec. Though, I suspect Final Cut X does support it - I just haven't used it in 5 years. It's attached to an old apple ID so I need track down that p/w so I can test it. 

I also wante to check to see what programs that I regularly use support the codec with Alpha in playback:

• Quicktime YES
• Finder YES
• MadMapper 3.7.5 YES
• VLC YES (but can't check for transparency)

Did Unity change something since 2018?  Freelancing at a small all Windows shop, they had to pick up a Mac Mini to import Apple ProRes 4444 with Alpha into Unity.