title: XNA to render 3D video (fixed FPS!)
body: <p>i have to develop an application in wich the final step is to export a video (or a single frame) of  a 3D animation generated by my software calculating the user input parameters.</p>
  
  <p>I want to use XNA and for this. i need that the software can export FIXED FPS video (or also all single frames of the video separately). It's not a matter the LIVE FPS. I don't need to view on the screen the frames at a fixed fps. As the animation could be very complex, i could accept if the software take 1 minute for each frame.</p>
  
  <p>The important is that i can see the frame while it render and that is not skipped any frame. 
  eg. if the video is 1 minute long, it have to export 24 frames at 24fps also if it will take 20secs to render each frame. After rendered the first frame (so after 20sec) it haven't to render the frame at 21sec. it have to render the frame [2/24 of the first minute]</p>
  
  <p>How can i obtain this?</p>
  
  <p>Thanks!</p>