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[OpenDivX] input and output format


I alway use OUT_420 mode of decore. 
Now it seems that encore() uses different input than the output of decore() 
(today's cvs). 

One (I hope it's encore) has Y,U,V in blocks: 

x*y bytes of Y, x/2*y*2 bytes of U,  x/2*y*2 bytes of V.  

And one (decore) has U and V interleaved, so it's 

x*y bytes of Y, x/2 bytes of U, x/2 bytes of V, x/2 bytes U, x/2 bytes V, 

Also output is upside down. Is that switchable? Because it's strange not 
beeing able feed output into input again. 


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