Re: Please drop 4:2:0 image support in bttv

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On Fri, 5 Dec 2003, Ronald Bultje wrote:
> Note that MPEG2 4:2:0 chroma ordering isn't the only valid 4:2:0.
> Scanline dropping is perfectly valid in other 4:2:0 cases. I'd say that

Thinking about this, aren't there two ways you could scanline drop?  Say you
have a frame made from two fields, with scanlines 1, 2, 3, 4, 5, etc.  If you
want to treat it as a single progressive frame (say because that's what the
source material happens to be) it would make the most sense to drop the chroma
from scanlines 2, 4, 6, etc. 

But if you want to treat it as two independent fields, you would want to drop
chroma from scanlines 3, 7, 11,... from the odd field and 4, 8, 12,... from
the even field.

The bt848 hardware has the capability to do both.  But it seems that the
driver only supports the former and not the latter?





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