FollowCut

FollowCut: type who the video is about, get a beat-synced vertical edit that follows them. Live demo: https://dylancc5.github.io/dev-meta-ai-events-global-hackathon/ I came back from three days in Portland with 23 clips and 56 minutes of footage, and edited none of it. That's every trip. The clips I care about are the ones of the people I was with, and the auto-editors I tried cut on faces, on speech, or on whatever is biggest in frame. None of them can do "make this about her." You type who the video is about: "the woman with long hair", "the man", "the man in sunglasses". SAM 3.1 segments that concept in every clip, so you see straight away which clips they're in and which they aren't. Muse Spark then gets the candidate moments as keyframes, with SAM's pick boxed in each one, plus a reference crop of the person. It throws out look-alikes, like a stranger at the airport gate who also counts as "the man", and returns a shot list on a 120 BPM grid with a reason for each shot. The renderer cuts a 9:16 edit where the camera follows that person and they stay in color while everything else fades to gray. Type a different prompt and the same footage becomes a different video about someone else. Who it's for: anyone with a camera roll full of trips they never got around to editing. You get hours of footage back as the moments worth reliving, centered on the people you love. What's next: re-identifying people across clips with embeddings, captions placed behind the subject using the mask, SAM 3.1 video tracking in place of per-frame linking, and a phone app where you pick an album, type a name and share the reel. Built with AI assistance (Claude Code). Footage is my own; music is royalty-free Apple Loops.