Mofi – Content-aware fill for audio to change a song to any duration
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…
In plain words
Mofi is a web service that adjusts songs to match a specific duration by identifying and removing or repeating audio patterns. Users import a track, set a target length, and can mark sections to prioritize or skip. The tool analyzes songs on the server, then allows preview and adjustment entirely in the browser using WebAssembly. It's designed for creators who need songs to fit video lengths or performance times precisely.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
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!
Does the same job
all alternatives →- ITI trained an AI model on 120M+ songs from iTunes2023 · maroofy.com · ▲753
Hey HN! I just shipped a project I’ve been working on called Maroofy: https://maroofy.com You can search for any song, and it’ll use the song’s audio to find other similar-sounding music. Demo: https://twitter.com/subby_tech/status/1621293770779287554 How does it work? I’ve indexed ~120M+ songs from the iTunes catalog with a custom AI audio model that I built for understanding music. My model analyzes raw music audio as input and produces embedding vectors as output. I then store the embedding vectors for all songs into a vector database, and use semantic…
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