The most critical "proper feature" for an MP4 music file is its ability to act as a . Unlike an MP3, which only holds audio, a proper MP4 should support the following integrated features: Core Multimedia Features
If you are looking to create or edit these files, a "proper" feature set in editing software should include:
If your interest stems from seeing "Topic" associated with music on YouTube, this refers to :
: High-end MP4 files can include multiple audio tracks (e.g., different languages or commentary) and subtitle tracks (like .ttxt ) within a single file. YouTube "Topic" Features
: A proper MP4 allows for advanced metadata, such as artist name, song title, and album art, which allows media players like MusicBee to organize files effectively.
: Topic videos generally provide the highest audio quality available on the platform because they are generated directly from the original high-fidelity files.