Huh? Nothing in AV Foundation about Windows or color handling on any platforms besides mac. "The AV Foundation framework provides an Objective-C interface for managing and playing audio-visual media in your Mac app." Great for mac owners and idevice owners. Not great for content creators that need to target devices used by the other 80% of the computing population.
What is the container format of the future that will provide a consistent viewing experience across all platforms? What is the low-bitrate codec that will enable half-hour or longer content to be viewed on wireless streaming devices, and over http wired connections?
Try it yourself. Choose a 30 minute piece of content - any tv show will do. Get as close to an uncompressed source as you can so that the full color range is present - deep blacks and pure whites. Encode it once in the container and codec of your choosing using any tool you like - a single file. View it on 3 windows machines of 3 friends without changing their setup or installing anything. View it on 3 iOS devices, 3 android devices, and 3 mac laptops without changing their setup or installing anything. Is the color accurately represented in all viewing environments? Pay special attention to the contrast and black and white levels. Is the black BLACK, or washed out grey? Is there aliasing? Is there aliasing at fullscreen? Is the file streamable? Can it be downloaded in a reasonable amount of time on a common home connection? hotel connection? airport wireless? 3G connection? Which OS platforms provide an experience closest to the original? Which OS platforms vary the most?
You probably won't do these tests. I do, every single day. There is a problem. The cross-platform color handling in quicktime is already badly broken, but at least users can play back something - even if it makes directors cringe and cry. No apple supported quicktime player on windows is going to make things worse.
