[GEM-dev] it it possible to use GPU accelerated h.264 decoding on OS X?

Roman Haefeli reduzierer at yahoo.de
Tue May 12 20:52:12 CEST 2009


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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