Update app.py

app.py

@@ -88,7 +88,8 @@ def get_frames(video_in, step, name, resize_w):
 def create_video(frames, fps, type):
     print("building video result")
     for j, img in enumerate(frames):
-        frames[j] = cv2.cvtColor(img, cv2.COLOR_RGB2RGBA)
+        img = cv2.imread(img).astype(np.uint8)
+        cv2.imwrite(frames[j], cv2.cvtColor(img, cv2.COLOR_RGB2RGBA))
     
     #https://zulko.github.io/moviepy/getting_started/videoclips.html#mask-clips