The reality is that you have better options:
If your goal is to normalize audio in MP4 files, here are some general steps you could follow: Mp4Gain serial
An Mp4Gain serial key is a unique code provided to users who purchase the software. The serial key serves as a license to activate the full version of Mp4Gain, unlocking all its features and allowing users to utilize the software without any limitations. The reality is that you have better options: