hello,

i don't work on osX, so things are working for me.

but did you try pix_delay / pix_diff ?

anyway, i usually do every pix_* things in shader, as it is usually faster and 
more flexible.
(it's faster, even if you have to use pix_snap)

c


Le 05/04/2011 13:53, Matteo Sisti Sette a écrit :
Hi,

Bug 3191771 renders the combination pix_video+pix_movement useless in Mac OS 
unless you can lower gem's framerate to ensure it is lower than the camera's 
framerate (which is not always an option), or unless one finds some other 
workaround.

The problem is that whenever a new frame from the camera is not available, 
pix_movement computes the new input frame as a black frame, and hence the 
resulting difference is almost all-white.

Note that the problem is NOT that pix_movement computes the difference between 
two identical frames yelding a black frame as a result. It's worse: when the 
new frame is not available, it seems it considers it as an all-black frame, so 
the output is the difference between a real frame and a black frame. That 
causes white flickering, not black flickering.


Does anybody use pix_movement and pix_video on Mac OS? How do you work around 
this issue?

Ideally I would like to find a simple and easy-to-understand solution, because 
I am teaching a Pd course and I'd like to give the students (most of whom use 
Mac) a workaround they can understand.

Thank you in advance
m.

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