[PD] gem advanced video keying

[Marco Donnarumma]

Hi there,

perhaps this Pd project below may be of some help.
I remember the presentation in Weimar and it was very well done.

https://puredata.info/downloads/extended-view-toolkit

It's not about keying, but, if I recall correctly, has a very nice setup
for blurring edges and combining multiple video streams for panoramic
projections using shaders.

Not sure whether it's still maintained or compatible with newer Pd version.

sorry if someone pointed it out already, I haven't followed the whole
conversation.

best,
M


   3. Re: gem advanced video keying (Py Fave)
>
>
> Date: Tue, 8 Sep 2015 16:44:46 +0200
> From: Py Fave <pyfave at gmail.com>
> To: hi <joson.android at googlemail.com>
> Cc: "pd-list at lists.iem.at" <pd-list at lists.iem.at>
> Subject: Re: [PD] gem advanced video keying
> Message-ID:
>         <CAAQHdpBr7j0RNwzDU+fMgy=
> q37ioY+haZw-CMYB42g4XCN-cZQ at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> 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
> >>> _______________________________________________
> >>> Pd-list at lists.iem.at mailing list
> >>> UNSUBSCRIBE and account-management ->
> http://lists.puredata.info/listinfo/pd-list
> >
>
>
> ****************************************
>
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