Claude Skills by mrieck

Assembling and rendering a demo video with Remotion and ffmpeg — the timeline, transitions, captions, zoom-to-click, audio ducking, and diagnosing a render that comes out wrong. Use when rendering the final video, customising its look, or fixing timing, black frames or missing audio.

Craft and mechanics of capturing software on screen for a demo video — rehearsing a flow, staging a window, the action-script format, pacing to narration, and macOS permissions and coordinates. Use when recording an app, driving a UI for a video, debugging a capture that looks wrong, or when clicks land in the wrong place.

Writing the script and shot list for a demo video, and the demo.json manifest schema. Use when planning what a product video should say and show, writing voiceover narration, structuring scenes, or editing demo.json.

Cut a vertical 9:16 Short (YouTube Shorts, Instagram Reels, TikTok) from a demo video project in one of four named styles — listicle (rapid numbered beats), cohost (split screen with presenter), flashcard (typographic interstitials), or glide (immersive pan). Use when the user asks for a "short", "shorts", "vertical video", "TikTok", "Reel", "9:16", or a social cut of a demo.

Make a demo video of a piece of software: drive the app on screen while narrating what it does, generate an AI voiceover and optional on-camera presenter, and assemble everything into a finished MP4. Use when the user asks to "make a demo video", "record a demo", "create a product video", "show off this app", "make a walkthrough video", or runs /create-demo-video. Handles web apps, dashboards, websites, macOS desktop apps, and CLI/terminal programs (including demos of Claude Code plugins).