[GEM-dev] pbs with GEM on macpro quad

hello, i'm curently working on a mac pro quad (and HCS pd39-2-extended RC1). i've got 2 problems.

1 st : reading movie does create a new thread as i can see in activity monitor, but the cpu used by pd + reading movie does never exeed 100% (i.e 25% of the all CPUs). is there a solution to improve this? i would like to be able to play many movie using 4 core of this computer.

i also have a problem with pix_coloralpha. it look like pix_coloralpha does not change the alpha chanel of the movie. i test the same patch / same movie on linux where everything is working ok. is there something that i should know to use this on osX?

thanks Cyrille