title: cv2.VideoWriter will not write file using fourcc h.264 (with logitech c920, python 2.7, windows 8)
body: <p>I am new to python (2.7) and opencv (3.0) (and video streaming/writing in general) so forgive this.</p>
  
  <p>I am using the logitech c920 as my webcam and it can stream video compressed in h264 format so I am trying to write a simple app that sets 4 properties of the VideoCapture instance (fourcc to h264; width to 1920; height to 1080; and fps to 30), and then records a video to the directory one level up named test.mp4 and shows the recording on my screen. Here is code:</p>
  
  <pre><code>import sys
  import cv2 as cv
  
  cap = cv.VideoCapture(0)
  fourcc = cv.VideoWriter_fourcc('H','2','6','4')                     
  
  cap.set(6, fourcc)
  cap.set(3,1920)
  cap.set(4,1080)
  cap.set(5, 30)                                  
  
  vid = cv.VideoWriter('../test.mp4', fourcc, 20.0, (640,480))     
  print vid.isOpened() #returns false :(                                                       
  while (cap.isOpened()):                                     
  
    ret, frame = cap.read()                                  
  
    if (ret == True):                                        
  
     #gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)          
  
  
     vid.write(frame)
  
     cv.imshow('window', frame)                           
  
     if (cv.waitKey(1) &amp; 0xFF == ord('q')):                  
      break
  
  cap.release()
  vid.release()                                              
  cv.destroyWindow('window')     
  </code></pre>
  
  <p>cv.imshow('window',frame) works just fine, and the properties are all set; however, vid.isOpened() return false so clearly I have done something wrong in the above. If I pass -1 for the fourcc, I am allowed to pick from a list of codecs and i420 is available and says (for logitech cameras) and vid.isOpened() returns true if I change the file extension from mp4 to avi (I guess that means i420 cannot be stored as .avi ?), however, test.avi is always huge and seemingly raw, 100MB for a few second test video and will not open.</p>
  
  <p>Any help with this would be great, thanks a lot                   </p>