Modify Brighness/Contrast, RGB, Gamma of a Video-Stream

vvvv beta general
1

Hello!
How can i modify these parameters of a video stream?
Thats how i patched it:
VideoIn(DS9)–>Videotexture–>Quad–>EX9 Renderer

And is there definetly n way to split this stream to 2 independent outputs? (not in span mode)

Thanks!

2

And is there definetly n way to split this stream to 2 independent outputs? (not in span mode)

there is a method, unknown performance though, make a flash file that captures the video and play in vvvv using the Renderer(flash) > GDI texture > quads. GDI textures can be shared across quads.

3

The VideoIn(DS9)–>Videotexture part made your video into a texture.

You can now do anything with it with it you could do with a normal filetexture (picture).

For example, getting 2 of the video halfs on 2 quad is a mather of doing a transform to the texture transform pin of that quad. (play with the scale to see results)

By default a Quad is white, so if you make the color of the quad grey, you have some kind of simple brightness controll.

For Alpha/Gamma you should look at some shaders. Options are endless.

4

http://vvvv.org/tiki-download_file.php?fileId=613
That does colour correction, contrast and luma keying in a shader.

5

Hello West,
exactly there’s the proble.It seems to be not possible to distribute a video feeted quad to two Video Outputs… with Filetexture no problem…but with video… :(
When i push the second renderer to my second screen(not in span mode, extendet desktop…)it stops and fades to gray.

Best regards
Olli

6

see FAQ Multiscreen and the links there.