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

[Dave Bevan]

> http://ffmpeg.org/trac/ffmpeg/ticket/437
> It is reproducible in linux I believe.
> $150 bounty!

I'm not actually sure this is a bug. RGB & YUV have differing colour
space, and differing gamut curves - conversion is NOT linear. On your
ffplay cmd output, the scale filter is inserting

[scale @ 03C06280] w:1680 h:1050 fmt:bgr24 -> w:1680 h:1050
 fmt:yuv420p flags:0x4

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. Further, within the YUV colour space, there are
different gamut curves - rec601 & rec709 for example.

Please read http://en.wikipedia.org/wiki/YUV for a more indepth
explaination.

--D.

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