Added example to record screen of Windows OS

examples/record_windows_screen.py

@@ -0,0 +1,22 @@
+import ffmpeg, time
+
+#Setup for recording windows desktop to mp4 file
+process = (
+			ffmpeg
+			.input(format='gdigrab',framerate=30,filename="desktop")
+			.output(crf="0",preset="ultrafast",filename="./output.mp4",c= "libx264" )
+			.overwrite_output()
+			)
+#Launch video recording
+process = process.run_async(pipe_stdin=True)
+
+
+#Let it record for 20 seconds
+time.sleep(20)
+
+#Stop video recording
+process.communicate(str.encode("q")) #Equivalent to send a Q
+
+# To be sure that the process ends I wait 3 seconds and then terminate de process (wich is more like kill -9)
+time.sleep(10) 
+process.terminate()