[PD] need a workaround for detecting movement in Mac OS

[Benjamin ~ 01xy]

Hello,

I don't work neither on Mac, but what about [pix_movement2], same pb ?

++Benjamin



cyrille henry a écrit :
> 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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