After Effects is very picky when it comes to real time previewing. It wants us to select a zoom level that correspondents with the resolution, does not like >8bits color, and is slow when a color workspace is selected for the project.
Why not give the user the option to ignore these and let it preview without workspace and in 8 bits or whatever we slect for the preview? Maybe even the codec?
Now we can only select Resolution and framerate.