The number following the '#EXTINF' section is the audio length in seconds. M3U is misunderstood in the sense that it is actually just a computer file in the format of a text file that stores a multimedia playlist or a simple URL to the actual audio/video content, usually used for streaming music/video on the internet.Īn M3U file offers the index entries to each music, but it's not a real audio file.Īll M3U files have similarities, but also differences.