Mp4gain is a software application that allows users to adjust the gain (loudness) of their MP4 video files. This is particularly useful for content creators and video editors who need to ensure their videos meet specific loudness standards for platforms like YouTube, Netflix, or other streaming services. Mp4gain supports batch processing and can adjust the loudness of multiple files simultaneously, making it a convenient tool for professionals and hobbyists alike.

: Patched versions often crash or fail to process files correctly, leading to corrupted media.