Downsampling 4K footage for an increase in chroma sub-sampling We have a Lumix GH-4 camera, which can shoot in 4K with 4:2:2 color space.
I'd like to be able to convert the footage to 1080p 4:4:4 color space.
I've read that there some ways of doing this:

http://www.dvxuser.com/V6/showthread.php?330608-GH4-Downsample-4K-to-1080p-10-bit-4-4-4
https://forums.adobe.com/thread/1483696

But I can't find a definitive step by step way of doing this.
I have the following tools:  

Adobe CS6 After Effects &amp; Premiere.
Final Cut X or 7.
Davinci Resolve v10
As I understand it, ffmpeg creates a raw image buffer with the input files it is given, then applies effects such as scaling and then encodes. So if you use ffmpeg to do the scaling and encoding to a 4:4:4 codec it should do what you want:

ffmpeg -i "my_gh4_422_4k.mov" -vf scale=1920:1080 -c:v prores -profile:v 4 -c:a copy "my_prores_444_1080.mov"


It would be interesting to test this, but I don't have any 4:2:2 4k footage on hand. I believe ffmpeg also does dnxhd 444, but I can't find any documentation on how to specify it.