Update app.py

app.py

@@ -86,10 +86,11 @@ def get_frames(video_in, step, name, resize_w):
 
 def create_video(frames, fps, type):
     print("building video result")
+    imgs = []
     for j, img in enumerate(frames):
-        frames[j] = cv2.cvtColor(cv2.imread(img).astype(np.uint8), cv2.COLOR_BGR2RGB)
+        imgs.append(cv2.cvtColor(cv2.imread(img).astype(np.uint8), cv2.COLOR_BGR2RGBA))
 
-    mediapy.write_video(type + "_result.mp4", frames, fps=fps)
+    mediapy.write_video(type + "_result.mp4", imgs, fps=fps, codec='hevc', encoded_format='yuv420p')
     return type + "_result.mp4"