title: How to simulate a webcam device
body: <p>I am working on a project which I need to synthesize a video from existing frames and then format it exactly like a webcam device and make it available to external computers.
  In other words, this USB output should look exactly as if it was generated by a webcam.
  Can someone provide some hints about any existing library or any methodology to do this?
  The target system to create "webcam" output via USB is UBUNTU.</p>
  
  <p>Thanks</p>