Color Saturation with openGL shaders

[Matthew Waters]

On 11/08/15 11:28, Hamdi Rakkez wrote:
> Hi,
>
> I'm using gstreamer1.5.1 on ubuntu 14.04.
>
> I want to know if it is possible to have a color saturation on a video
> stream with opengl shaders.

Sure, it's possible.  Two options

1. You can write your own shader and use the glshader element.
2. You can write an element based on glbasefilter/glfilter

Here's an example shader for use in the glshader element

#ifdef GL_ES
precision mediump float;
#endif
varying vec2 v_texcoord;
uniform sampler2D tex;
uniform float time;
uniform float width;
uniform float height;

void main () {
  gl_FragColor = texture2D( tex, v_texcoord ) * vec4(0.2, 0.8, 0.7, 1.0);
}

Cheers
-Matt

> Thanks.
>
> Best,
> Hamdi

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