On 4/17/07, cyrille henry <cyrille.henry@la-kitchen.fr> wrote:

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.

Depends on what codec you use. All of the DV codecs use multiple threads to decompress and so does Apple Intermediate Codec.

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?

The default colorspace on OSX is YUV so there is no alpha. You can send a 'colorspace rgb' message to pix_film which will slow everything down a lot or use a shader which will be fast.

thanks
Cyrille