Dear list,
this archived list entry:
http://lists.apple.com/archives/quartzcomposer-dev/2007/Apr/msg00066.html
says the Video Input patch has a setting for frame size, which would
be *exactly* what I need.
Am I missing something here?
I don't find the setting, neither in QC3 nor QC4.
Thanks in advance.
Take care, Oli
On 28.01.2010, at 14:57, Oliver Busch wrote:
Dear list,
long time no see.
I've been working on some (really basic :) augmented reality stuff
for the last few days which I want to be presented in a POS style
fashion, e.g. a portrait oriented display with a hidden, mounted
(USB) camera.
After reading a few reviews I opted for an Logitech QuickCam Vision
Pro.
The camera and is especially suited for OSX and the image quality in
QT based apps ist amazing (2 MP sensor, Zeiss lens, AF, low noise,
good low-light and whatnot).
But:
For some reason Quartz Composer captures the signal of the Logitech
camera in its native video size, e.g. 1600x1200 pixels.
Which - assuming this is an uncompressed (YCrCb or the like) video
stream - easily saturates the USB bus.
Which leads to a frame rate of 5-6 fps.
As this is a driverless "USB video class" camera there's no
preferences app to setup or fiddle with.
The image of the built-in iSight is captured at 640x480 pixels in
QC, even though the iSight has a higher native video size (1280x1024
if I remember correctly).
So, pretty long story, two short questions.
1. After I returned the Logitech camera, what kind of external (UVC)
video cam can you recommend for use with QC?
I'm thinking XBox Live Video Cam (which seems to be 640x480 native).
2. Is there an alternative video input patch where you can modify
the capture/output size?
Thanks in advance,
Oliver
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