Update app.py

app.py

@@ -16,6 +16,11 @@ def transcode_video(video_file, output_file, output_format, output_fps):
     The path to the transcoded file.
   """
 
+  # Create a folder to save the transcoded video file to.
+  output_dir = os.path.dirname(output_file)
+  if not os.path.exists(output_dir):
+    os.makedirs(output_dir)
+
   # Transcode the video file.
   ffmpeg.input(video_file).output(output_file, format=output_format, fps=output_fps).run()