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For IPTV or web radio, the duration in the #EXTINF line is usually set to -1 because the length is unknown.

#EXTM3U #EXTINF:240,Song Title - Artist Name C:\Music\folder\song1.mp3 #EXTINF:-1,Live Stream Title http://example.com #EXTINF:180,Local Video File /Users/Name/Videos/video1.mp4 Use code with caution. Copied to clipboard Key Tips for Usefulness

Use relative paths (e.g., song1.mp3 ) if the M3U file is in the same folder as your music. Use absolute paths (e.g., C:\Users\... ) if it is stored elsewhere.

To be recognized by most players, the file should follow the format. Each entry consists of two lines:

If you are looking to create a "useful" version of this file, it usually contains paths to local files or URLs for internet radio/IPTV streams. Structure of a "Useful" M3U File

If you have 140 files to add, you can use the Command Prompt (Windows) to list them quickly: dir /b *.mp3 > 140.m3u (Note: This creates a basic M3U without the Extended metadata lines, but most players will still read it.) How to Play It

Once saved, simply the file and select Open with... followed by your preferred media player (VLC is the most compatible choice).

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