For stubborn files, use the open-source FFmpeg tool to remux the video stream without re-encoding, which preserves the original quality. Use the command line interface to execute: ffmpeg -i input_waaa412.av -c:v copy -c:a copy output.mp4
If you need further help with this format, please let me know: The of the portable device you are using waaa412 av portable
for better picture quality. Find compatible AV cables for specific old consoles. For stubborn files, use the open-source FFmpeg tool