Update app.py

app.py

@@ -61,7 +61,7 @@ def im_2_vid(images,fps):
     print (width,height)
     size = (width, height)
     codec = cv2.VideoWriter_fourcc(*'mp4v') #DIVX, DIVD
-    video = cv2.VideoWriter(vidName, codec, fps, size)
+    video = cv2.VideoWriter("tmp_vid.mp4", codec, fps, size)
     for img in images:
             video.write(img)
     return (video)