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When a developer builds a video editing tool (let's call it "VideoMaster Pro"), they build it against the version of FFmpeg that is current at the time. If they built it in 2022, they used FFmpeg 5.x, which produces avformat-59.dll .
For developers interested in using Avformat-59.dll in their free and open-source projects, we recommend: avformat59dll free
scoop install ffmpeg