Show HN: Mofi – Content-aware fill for audio to change a song to any duration

mofi.loud.red

708 points

3 years ago

I worked on a web service that allows you to import a song and define a target length that the song will be shortened or lengthened to. It does this by analyzing the song and finding repeating audio patterns. This is helpful for making any song match a video or performance with a set duration. You can also specify areas of the song to prefer or avoid. An example is available here: https://mofi.loud.red/edit/8bd3fdf780f8c3927e41029f3b957f8a7...

The cool thing is that after the song is analyzed on the server, the client can recompute and preview the results completely client-side through an implementation that uses Web Workers and WebAssembly. The audio previewing uses Tone.js. I am thinking of writing up some more details about the implementation in the future.

I'm still working on a way to explain this easily, but I like the idea of carrying over the concept of content-aware fill from images to audio.

Please let me know if you have any comments or questions!

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