[GEM-dev] gem framerate acuracy

[marius schebella]

chris clepper wrote:

>     I have experienced that using a wrong codec or color mode can strongly
>     affect the cpu. even if you are on a mac, gem does not support all the
>     driver features of other mac native programs (as far as I know).
> Like what features?

I was thinking Gem does not support all codecs.


>     the
>     fastest codec for me was fotojpeg. 
> 
> 
> There are many more efficient codecs but most are specific to a 
> standard.  DVCPro-HD at 1080 or 720 is far faster than P-JPEG

with "faster" do you mean less cpu consuming? I thought the fastest/less 
cpu consuming is a frame by frame codec like photo-jpeg because the gfx 
card can just take the jpegs and texture them onto a geo???

>     uyvy would be the fastest colormode,
>  
> 2vuy is just as efficient and better supported which is why GEM uses it 
> on OSX.

maybe I was thinking of the isight, which uses uyvy, and a conversion 
slows the process down.

> Apple Intermediate is more efficient than Photo-JPEG.  It is fully 
> supported by GEM.

since you are probably the only one who knows that, can you explain how 
gem deals with the codecs? only if you have time... I do not understand 
why the apple intermediate should be faster for example when using the 
movie as a texture for a rectangle than the frame by frame jpeg compression?

marius.