yup the codec is too heavy

video_tool.py

@@ -22,7 +22,7 @@ def add_subtitle_to_video(input_file, subtitle_file, output_file, start_time, en
     (
         ffmpeg
         .input(input_file)
-        .output(file_name.cut_video_file, ss=start_time, to=end_time, acodec='copy', vcodec='libx264', preset='ultrafast')
+        .output(file_name.cut_video_file, ss=start_time, to=end_time, acodec='copy', vcodec='copy')
         .run(overwrite_output=True)
     )