Andrew:  interesting testing.  We will add the 3 opts files of utvideo.qt, r210.qt, and v210.qt -- you never know who might want them.  As far as pixel formats go, you would not believe how "smart" the correlation between CinGG and ffmpeg is.  In the Video wrench for qt menu, there is Pixels textbox field with a down arrow.  When you click on that down arrow to the right, it is so smart that it shows you the legal pixel formats.