The video might be using hardware acceleration for the h.264, but getting no benefit.  Quicktime player just displays the movie and nothing else, while GEM requests the fully decoded pixels in RAM.  The video might be getting uploaded to the GPU, decoded, then bounced back to RAM and then uploaded again.  Apple has some new optimized ways to play video, but they are far too limited for use in GEM.

On Tue, May 12, 2009 at 2:52 PM, Roman Haefeli <reduzierer@yahoo.de> wrote:
hi all

somehow related to frank's question, but i would like to achieve the
opposite: _more_ hw acceleration (instead of less).

i found, that on new macs, playing even full-hd h.264 quicktime files
doesn't eat any noticable cpu processing. on a macbook pro unibody, it
takes around 13% (says 'activity monitor') playing it with quicktime
7.X.X.  the same movie played by [pix_film] from Gem from
pd-extended-0.40.3 takes ~60% (of one core). if it is correct to
believe, that gem makes use of the quicktime API on os x, is there a way
to make it use of the gpu accelerated h.264 decoding feature?

hm.. i should have checked, whether the plain decoding uses much cpu or
if probably some significant chunk is used for displaying. i'll test
tomorrow, when i have access to a mac again.

any hints about the topic are welcome.

roman




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