explainer-engine — a branded video generator, built from scratch

This week's big build: explainer-engine, a tool that turns a topic into a fully branded, narration-free explainer video — kinetic text, data visualisations, glowing spheres, network graphs, all in the pangea8 neon-mint style, with its own generated soundtrack. No footage, no voiceover, no editing: it renders everything from code into an MP4. It grew into a proper desktop app over a few days. You describe an idea in a chatbot-style interface and it writes a spec, then renders the video locally on your machine. I added a Templates mode so it runs without an API key, parallel multi-core rendering for speed, a Draft quality option, and a Full/Draft selector. The soundtrack engine was the most fun part. Instead of one repetitive loop, it now has six mood palettes — emotional, uplifting, cosmic, driving, tense, playful — each with its own chords and tempo, auto-picked from the topic, in a Fred again..-ish style. I also cleaned up the audio so there's no hiss and no clipping. Then the real-world fixes: Uzbek text was overflowing the frame, so I made every text block auto-scale and wrap; added an EN/UZ language toggle so the whole video renders in the chosen language; fixed Safari downloads; and — after one render ran for a full day and filled the disk — capped video length and made the whole pipeline fail safely instead of crashing.