we are trying to read back realtime video data from the graphics card on a
quadcore G5. unfortunatly, we have the cheapest card in currenlty and we
expect the Quadro FX 4500 to perform _much_ better on this task. Probably
the 7800 GT would already perform better, but were not sure and we can't
afford them unless we know that they really are much faster... .
we are trying to get the QCTV-app to run as fast as possible, as we want
to stream the video after manipulation to disk in realtime. as QCTV uses
glGetTexImage and we believe that this is the bottleneck of the app, we
would like somebody with acces to a computer with a Quardo FX 4500 or a
7800 GT to give us a speed-estimate on that card.
if you have such a card and xcode installed, we would like to ask you to
run this test for us:
and compile it with xcode. then start the app and set a resolution of
1280x800 and enable the export to Qucktime movie in the upper right corner
of the app. select 'Photo JPG' as compression type. Set it to export 60
frames per second. further open the 'paramaters inspector'-window and
enable the FPS-display and tell us, how many FPS you were able to export
to the movie file.
our Quad-G5 with the 6600-card we can read 19 frames per second to disk
and we believe that the glGetTexImage is the limiting factor to and
exactly this routine should run faster on the Quadro FX 4500.
