Scandy wrote:
BTW, there are not any video sources that use 12 bit yet, so there is no advantage to setting 12 bit color. You should set it to 8 bit for now.
Well, yes and no. 
To my knowledge there’s still nothing available commercially as 12-bit, but there is some 10-bit anime around now.
But, the issue remains that the Sigma chip driving the WDTV can’t decode 10-bit streams (or 12-bit streams, were someone to produce one).
The 8655 and 8654 only have inputs for 8-bit YCbCr video (as far as I can see in Sigma’s documentation).
So yes, you can only feed the 8655 and 8654 8-bit streams.
It converts them internally into a 12-bit colour space, and processes the video in a full 12-bits, and can output in “12-bit”, but as you say, the picture isn’t any “better”. There isn’t any extra colour… there’s still only 256 steps to each colour value. It just takes the 8-bit values and multiplies them by 16 to move them into a 12-bit space.
So yes, there’s no advantage to setting the output to 12-bit for watching 8-bit encodes (and 10- and 12-bit encodes physically can _ not _ be watched at all). If the box won’t “remember” a 12-bit setting (or it’s been disabled in some cases), you aren’t losing anything visually by sticking with 8-bit output.
Getting 12-bit “working” again would appear to be at the lowest priority, since it has no discernible effect on output.
