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Building an offline audio editor in Flutter: what the platforms won't encode for you

by Johnny Nguyen dev.to

5 min read

I work on AuCut at W Lab. It is an audio editor for iPhone and Android: trim a recording, pull the audio out of a video, convert between MP3, M4A and WAV, change the volume or the speed. Everything is processed on the phone and no file is uploaded. That one rule shaped most of the architecture, and this post is about where it got awkward. One Flutter UI, two native engines, and FFmpeg The UI is F…

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