[PD] gem advanced video keying

[Py Fave]

check this

http://www.casparcg.com/

2015-09-07 19:28 GMT+02:00 hi <joson.android at googlemail.com>:
> thanks for the answer!
>
> i will need to start to use shaders one day, i know that long already **dream** For now the project goes back to the drawer
>
> I would love to see a new pd convention to find motivation for week intense pd work..
>
>
> Am 26.08.2015 um 09:46 schrieb Py Fave <pyfave at gmail.com>:
>
>> you need to use glsl shaders to do that efficiently .
>>
>> first check for existing shaders
>>
>> you will need a powerful gpu
>>
>>
>>
>> ------------
>> this is a  lumakey example  (was sent to me by chdh)
>> --------------
>> keying.frag
>>
>> -------------
>> uniform float R,G,B,K;
>> uniform sampler2D texture;
>>
>> void main (void)
>> {
>>    float d = 0.;
>>    vec4 color = texture2D(texture, gl_TexCoord[0].st );
>>
>>    d+= abs(color.r - R);
>>    d+= abs(color.g - G);
>>    d+= abs(color.b - B);
>>
>>    d*=K;
>>
>>    color.a = abs(d);
>>
>>    gl_FragColor = color;
>>
>> }
>>
>> ------------------------------
>>
>>
>> 2015-08-12 15:13 GMT+02:00 hi via Pd-list <pd-list at lists.iem.at>:
>>> Dear Pd folk,
>>>
>>> I am investigating options to improve chroma keying within pd and gem to use within a theater installation. I need more advanced keying features than seemingly possible with [pix_choma_key], like border corrections and smoother edge transparencies. The best thing i found so far is this:
>>>
>>> http://forum.pdpatchrepo.info/topic/2953/neat-chroma-keying/3
>>>
>>> very nice, but i would need more a quality like in readymade video mixers
>>> Did any of you program anything like that?
>>>
>>> Also i'm trying to find out, whether a potential setup with a computer with 4 HD-SDI inputs would be capable of keying 2 HD-live-signals at the same time and overlay that over one HD-live-background.
>>>
>>> Are there any experiences (hardware and software) from your side, you could share?
>>>
>>> I would so much love to make this happen with pd and not with an expensive video mixer i would have to buy.
>>>
>>> Any help or ideas are appreciated.
>>>
>>> Love to pd,
>>>
>>> jonny
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>