Alexander Korbanov (Clipwing) · Claude SFX skill

real-sfx

real-sfx is a Claude Code skill from Alexander Korbanov at Clipwing that sound-designs motion videos with real recorded sounds from the user's own library, not generated ones. Claude finds the moments in the picture, picks and processes recordings, places them on the exact frame and keeps the existing music and voice. The output is a new MP4 plus a separate SFX track. It works through a set of Python scripts that analyse frames, read a project's event list or timeline, mix with FFmpeg and run a critique loop. The skill cannot synthesise sound, and the README states that Claude cannot hear. It therefore chooses sounds by measured character, spectrogram images and optional YAMNet tags, and lists five moments for a human to check by ear. It ships without a sound library, though a bundled UI pack provides 78 CC0 cues. It needs Python 3.9+ and FFmpeg, and has a self-test of 189 checks that takes about five minutes. Scripts are MIT licensed and the bundled sounds are CC0. The text gives no star count or release version.