[FFmpeg-user] bounty: fix this bug #437 $150

[Thomas Worth]

> which WILL change colours, because yuv is a compressed colour space
> (pure black is 16,16,16 and pure white is 235,235,235), always has been,
> always will be.

This is only true for Rec. 709. Rec. 601 can be 16-235 or 0-255 (per
JFIF spec), although SD broadcast is typically 16-235. In either case,
anyone can force Rec. 709 to be full range, although encountering this
would be unlikely.

It is possible to see 601 material as full range, even in HD. Canon
compresses their HDSLR footage with Rec. 601/full range. And yes, it's
HD and not SD. And yes, this is very unusual. But it's a fact.