On Nov 17, 2009, at 9:35 AM, Glen Ruedinger wrote:
I trying to convert a captured video frame from YUYV to YUV420P,
which on
the surface appears to be a straight forward operation. From my
research I
thought the only difference is that the YUYV is a packed format and
the
YUV420P is a planar format. So what I tried to do is create a planar
buffer, and then move the bytes from the YUYV to the planar buffer. Y
followed by V and then U
I did get a video image and brightness appears correct (the Y), but
the
colors are incorrect (V and U).
Well, yuv420 is 4:2:0 sampled, and yuvu is 4:2:2. The colors are wrong
how? Did you rescale the U and V to the correct height?
What that means is, taking for example a 320 x 240 movie, in 4:2:2,
you would have 320 x 240 of Y, and 160 x 240 of U and V. There's lots
of info about the packaging. The yuv420 version (4:2:0) has 320 x 240
of Y, but only 160 x 120 each of U and V.
Bruce
Any light anyone can shed on the difference that I'm missing would be
greatly appreciated.
And yes I know I can use libswscale to do the conversion but
libswscale is
GPL'ed and I'm trying to only use LGPL code.
Thanks
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