With 14MHz you will have just over 3MHz left for the application.Perspective: ... Just over 3 MIPS left...
RayAdded after reading forward 2 posts:
I Think this is indeed a great effort. Not being a video-dude (I did work on tube TVs back in high school and did get zapped painfully by a green-screen mono monitor for an Apple II), I am impressed that the little AVR has any bandwidth left.
My 3 MIPs remark is A positive statement, 21% of the uC cycles are still available! I have not compiled and profiled SRAM and Flash remaining, but with RISC chips my belief is that there is enough left here for some fun!