[jitter] cc.uyvy2rgba.jxs and optimization

I posted the patch earlier in this thread:
http://www.cycling74.com/forums/index.php?t=msg&goto=121838&rid=0&S=d8d9e7b93c064870c613751e65b06833&srch=cc.uyvy2rgba.jxs+and+optimization#msg_121845

have a look at it. it explains pretty good what I am doing.

Photo Jpeg is a YUV Codec? and I was was convinced it stores RGB Data. I 
will have to do my homework on that.

But if this is so: a Photojpeg file with dimensions x, y, decompressed 
with jit.qt.movie @colormode uyvy decompresses way slower than a x/2, y 
sized argb movie with jit.qt.movie @colormode argb. Why is this so. 
(again, have a look at the patch to see what I mean).

John.

vade schrieb:
> Hm, I must be missing something? What do you mean "store" a uyvy 
> "within" argb? UYVY has 3 planes to ARGBs 4? Youre going to loose 
> something somewhere.. unless you are being really tricky! (do share!)
> 
> Official UYVY codec? dont know, but any YUV codec should do, from my 
> understanding. Uncompressed 10 and 8 bit 4:2:2 YUV from Apple, 
> MJpeg/PhotoJpeg , DV, DVCPro, DVCProHD and so on
> 
> http://www.fourcc.org/yuv.php
> 
> On Jan 3, 2008, at 4:16 AM, John Dekron wrote:
> 
>> HI Vade,
>>
>> vade schrieb:
>>> Hm. Unless I am mistaken, UYVY does absolutely nothing with the alpha 
>>> channel what so ever. That information is lost to the ether unless 
>>> you use the alphaglue shader and read in the alpha via other means. 
>>> UYVY has no alpha channel, and I dont think that jit.qt.movie 
>>> premulitplies alpha for you while doing the conversion?
>> That is right. I was referring to the method where I store an uyvy 
>> movie in the argb animation codec. the alpha channel stores the u 
>> component.
>>
> 
> _______________________________________________
> jitter mailing list
> jitter at cycling74.com
> http://www.cycling74.com/mailman/listinfo/jitter
>