Thanks,
Yes I get more FPS in asynchronous mode in fact over 30 BUT it still
is not smooth like in QT. Still has a bit of a judder. I can even see
the QT version running smoothly full size with QC version juddering in
the background! Would have really liked this to work for a video
installation I am creating for a show in a couple of weeks. I can even
see the QT version running smoothly full size with QC juddering in the
background!
On 12 Aug 2008, at 14:47, Christopher Wright wrote:
I have a video (1280 x 720 Photo JPEG) that plays back fine in
Quicktime but only achieves 18-20 FPS in Quartz Composer so I get a
jerky motion. I would really like to play this back in QC. My
Laptop is a Powerbook Pro 2.16GHz 2GB the GPU is RadeonX1600. Just
interested as to why this might be.
The Movie Loader patch has terrible performance :( (We are fighting
with this too on a project) -- for slightly better framerates, try
opening the inspector panel, and making the patch run in
"Asynchronous" mode. You'll lose the ability to jump to arbitrary
times, but you'll gain the ability to play audio from the movies --
depending on what you're trying to do, this may be completely
useless and unhelpful, or it might get you a few more fps.
<mode type="nerd">
The movie loader patch performs poorly perhaps in part because it
requires the composition's frame time each frame. Because the
composition often runs at a different framerate than the movie, the
movie loader has to wait till the next composition frame to see
exactly when it is. Because of this, it can't simply decode "the
next frame", because that's not correct with respect to time.
Quicktime has an advantage here, in that it can run at whatever
framerate it wants, and can just decode the movie sequentially
(jumping to arbitrary points is possible, but not the common case),
which is pretty cheap for most codecs. seeking to a given frame/
time though is maybe a bit more expensive, and QC effectively does
this every frame.
</mode>
--
[ christopher wright ]
[EMAIL PROTECTED]
http://kineme.net/
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