You can add MP4 files to the software by clicking on an "Add File" or "Add Folder" option, depending on the version of Mp4Gain you're using.
Mp4Gain can be a useful tool for ensuring your MP4 files have a consistent volume level. While the software and its serial key are easily obtainable through purchase, always opt for legitimate channels to acquire software licenses. This not only ensures the software works as intended but also supports ongoing development and reduces the risk of malware. Mp4Gain serial
Most people don't know that VLC can normalize audio in real-time. Go to and enable "Volume normalization." While this doesn't permanently modify the file, it solves the playback issue instantly. You can add MP4 files to the software
