Update app.py

app.py

@@ -50,7 +50,7 @@ result = {}
 
 
 vid_frames = np.random.rand(100, 100, 3)
-out = cv2.VideoWriter("static/test_video.mp4", cv2.VideoWriter_fourcc(*'H264'), 10, [ 100, 100 ] )
+out = cv2.VideoWriter("static/test_video.mp4", cv2.VideoWriter_fourcc(*'mp4v'), 10, [ 100, 100 ] )
 for j, frame in enumerate(vid_frames):
     out.write(frame)
 out.release()