X11中的Caputre OpenGL窗口具有快速帧速率 - 可能吗？

I have an OpenGL application with the size of 800x600 running on my linux machine (X11). The content of this application (the rendered image) should be exported via network to another PC. First of all, i want to know if it is possible to take snapshots of the applications window with about 30 Hz, save them to jpeg and export them to the other machine via HTTP or whatever (like the IP Cameras are doing). Is it possbile to read the graphic's cards memory (Radeon HD 5800) in a fast way so that i can get a framerate of about 30 pictures per second?I have an OpenGL application with the size of 8