pyang5166/gbro-collage-broll

gbro-collage-broll is an agent skill, meant to be dropped into an AI coding agent's skills folder, that turns a short voiceover line, around five seconds long, into a polished B-roll video clip. The visual style is a halftone paper collage look: flat colored paper backgrounds, black and white halftone photo cutouts, and bits of colored cardstock, with pieces sliding in and locking into place one at a time like stop motion, rather than a simple fade in or slow zoom. The delivered clip is a silent, vertical 9 by 16 video, five seconds long, at 720 by 1280 resolution and 24 frames per second, meant to sit directly under a voiceover. The core of the skill is not just a prompt template but a required three stage approval process, so that a person's attention goes toward judging the creative idea rather than burning money on generation costs. In the first gate, the skill proposes a visual metaphor, meaning the core idea, the key objects, the background color, and the order pieces assemble in, without generating any image or video yet. Once that is approved, the second gate generates a colored still collage frame plus a contact sheet for review. Only after the still frame is approved does the third gate generate the actual video, using Google's Gemini Omni Flash model to build an animation between a first and last frame, along with quality checks like frame by frame sampling and verifying the first frame starts empty. When processing many voiceover lines at once, only the lines that pass each gate move on to the next stage. Getting set up requires a Codex style agent environment with a built in image generation tool for the still frame stage, a Gemini API key from Google AI Studio since video generation is billed by usage, Python 3.10 or newer, the google-genai Python package, and ffmpeg for handling video frames and building the contact sheet. A setup check script runs automatically the first time the skill is triggered and points out anything missing. The README does not mention a license for the code.