mp3-loop is a lightweight C program that converts any MP3 audio file into a seamless 1-hour loop. Inspired by those long, relaxing YouTube playlists that loop your favorite tracks for hours, this tool gives you the power to do the same — but offline, and with your own audio files.

You’ve probably come across those 1-hour versions of songs on YouTube — ambient tracks, game soundtracks, lofi beats, or even meme songs. They help people relax, study, focus, or just enjoy a good vibe.

So taste this medicine:

mp3_loop your-audio.mp3

...and enjoy your favorite track on loop, without ads, buffering, or distractions.

Make sure you have the following dependencies installed:

• libmpg123 – MP3 decoding
• libmp3lame – MP3 encoding
• libsndfile – (used via pkg-config)
• CMake (v3.12 or higher)
• GCC or compatible C compiler

sudo apt update
sudo apt install build-essential cmake libmpg123-dev libmp3lame-dev libsndfile1-dev

1. Clone the repository:

git clone https://github.com/zephurion/mp3-loop.git
cd mp3-loop

2. Configure and build using CMake:

mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release
make

This will produce an executable called mp3_loop inside the build/ folder.

Run the tool from the build directory:

./mp3_loop your-audio.mp3

If everything goes well, you'll get a new file:

1 hour - your-audio.mp3

It’s the same track, seamlessly looped until it hits exactly 1 hour with a subtle crossfade between loops.

Need help?

./mp3_loop help
# or
./mp3_loop -h

mp3-loop/
├── CMakeLists.txt # CMake build file
├── include/
│ └── main.h # Header for function declarations
├── src/
│ └── main.c # Main program logic
├── build/ # Build output (created after compiling)
└── README.md

Want to loop an audio meme or a soundtrack from a game? Just download it as MP3, and let mp3_loop do the rest.

MIT License — feel free to fork, modify, and share.

Enjoy looping. 🌀