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

[chris clepper]

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 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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