XLib and Xvfb: capture screen

[Ilya Anfimov]

On Wed, Feb 08, 2017 at 01:16:18PM +0300, Alex Sviridov wrote:
>    Hi all
> 
>    This is my c++ code which I use to capture screen:
>        Display* display = XOpenDisplay(NULL);
>        Window root = DefaultRootWindow(display);
>        XWindowAttributes attributes = {0};
>        XGetWindowAttributes(display, root, &attributes);
>        int width, height;
>        width = attributes.width;
>        height = attributes.height;
>        XImage* img = XGetImage(display, root, 0, 0 , width, height,
>    AllPlanes, ZPixmap);
>        ...
>        XDestroyImage(img);
>        XCloseDisplay(display);
> 
>    When I run it without Xvfb I get a normal screen picture. However, when I
>    use it in Xvfb is not not normal. For example I tried to capture youtube
>    in firefox as a result I see some green/blue image with you tube pieces.
> 
>    This question was asked on stackoverflow
>    [1]http://stackoverflow.com/questions/42110050/xlib-and-xvfb-capture-screen
>    and there can be seen the result image.
> 
>    How to fix it?

 Try
Section "Extensions"
  Option	"XVideo"	"Disable"
EndSection

in xorg.conf, or -extensionXVideo in Xvfb command line.