@Andrew
@Andrea, for some reason I can't download attaches from forum (because I have no login there?), can you add CMS.txt as attachment to email (again)?
I'm opening a new email because color has nothing to do with the Vdpau/Vaapi issues. It was just an attempt to put together all the information on how CinGG treats color. Lately I found emails from Hermann Vosseler that are very indicative. However, the fact remains that each plugins of CinGG treats the color in its own way, so we should find a way to understand how all the native plugins act, one by one (if I'm not mistaken, the plugins of ffmpeg clip everything to 8-bit and sRGB). Only with this information can we reconstruct a chain of steps that accounts for color transformations and, perhaps, keep them under control. Sorry, I've been pushing too much color lately, it's best to let it go. Hermann already knew in 2012 that it was not possible to treat it in CinCV and that's also why he went for Lumiera.