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

[Roman Haefeli]

On Tue, 2009-05-12 at 16:46 -0400, chris clepper wrote:
> 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.

i see. thanks for the explanation. one reason, why i was thinking, that
gem doesn't use hw acceleration was that the cpu power used is quite
similar to the ones, when the same file is played by mplayer or vlc. but
according to what you say, it would probably be still impossible to play
1080p with [pix_film] without hw accel.

roman
> 
> On Tue, May 12, 2009 at 2:52 PM, Roman Haefeli <reduzierer at 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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