Skill UI

Craft polished demo videos from screenshots or scene descriptions, orchestrating Playwright screenshots, narration via edge-tts, and ffmpeg compositing with clear story beats, pacing, and single-focus scenes so product walkthroughs and marketing teasers feel cinematic.

This utility burns an SRT subtitle track directly into an MP4 video file using ffmpeg's libass filter. It re-encodes the video (H.264) while copying the audio untouched. It supports defining custom font fallback chains (e.g., CJK fonts) and provides detailed control over font size, margins, and video encoding parameters (CRF, preset) for professional subtitling workflows.