> Idle question time ;)
>
> y4mscaler can convert from 4:2:2 to other chroma sampling (such as
> 4:2:0). It seems though that there's more than one flavor of 422
> out there - there's YUY2, UYVY (at least). Which one should be fed
> into y4mscaler?
None of them --- those are all packed formats, and the permutations of
letters describe different packings, not different subsamplings.
As I have kvetched before, FourCC's are so lacking in meaning as to be
practically irrelevant. fourcc.org only lists one code which possibly
denotes a planar 4:2:2 mode, with the dubious description:
Y42B - Weitek format listed as "YUV 4:2:2 planar".
I have no other information on this format.
Yep, "FourCC - Information you can rely on!" I'm better off watching
a Fox News broadcast.
Getting back to y4mscaler, no matter what the subscaling is, the input
is planar Y'CbCr, with the planes presented in that order. The 4:2:2
subsampling is 'industry standard', with the chroma grids vertically
aligned on the first luma pixel.
> Hmmm, the next question would be how complete the support is for
> 422 in mpeg2enc but that can wait for another night <grin>
Do any consumer hardware MPEG players support 4:2:2 profiles? I know
they exist in the standard, but from what I remember reading, they
seemed to be discussed as whizzy super-extended modes --- so I'm not
sure where you would play them even if mpeg2enc would compress them
for you.
-matt m.
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