[GEM-dev] pbs with GEM on macpro quad

cyrille henry cyrille.henry at la-kitchen.fr
Wed Apr 18 22:24:03 CEST 2007


chris clepper a écrit :
> On 4/18/07, cyrille henry <cyrille.henry at la-kitchen.fr> wrote:
>> >
>> >
>> > Depends on what codec you use.  All of the DV codecs use multiple
>> > threads to
>> > decompress and so does Apple Intermediate Codec.
>> i made a test patch that should decompress and display about 10 DV
>> quality movie.
>> the activity monitor says that pd use more than 30 threads.
>> BUT, pd use 25% of every core, and GEM display 3 images /s.
>> there is a problem somwhere, but i can't find what.
> Which version of GEM? 
0.91-cvs, april 14 2007, from HCS installer

> There is a problem with the QT DV component looping
> the audio track that will do exactly what you describe.  I disabled the
> first audio track in any movie file in the GEM code but your clip might 
> have
> more than one audio track.
i'm quite sure there is not audio track.

> Also at a certain point you will hit the limit of what the machine will do.
> The Mac 'Pro' isn't as fast as Apple's marketing wants it to be.  The Intel
> chips have serious memory bus speed problems and the OSX kernel likes to
> destroy any CPU affinity.
hum. i don't need the fastest computer of the world, but i just want to 
use the 4 cores!

> If you do not need any pix_ objects for processing then use pix_movie.  
> That
> will improve performance quite a bit since it uses the fastest texturing
> path.
yes, that does improve performances.
i hope using pix_movie + shader will be ok.

thanks a lot

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