lh-video-gen_skill

Overview

This skill generates vertical short videos (9:16) directly from a Markdown script. It parses script sections into visual cards and speech, produces TTS audio for each segment, renders subtitle cards as images, and composites everything into a single MP4 using FFmpeg. The workflow is designed for fast, repeatable production of short-form social videos.

How this skill works

The tool parses a Markdown script that divides the video into segments using --- separators and expects fields for scene description, spoken text, and subtitle text. For each segment it generates TTS audio, creates a 9:16 subtitle/card image (or loads a provided image), then uses FFmpeg to merge the image with the audio into a clip. Finally it concatenates all clips into one vertical MP4 output.

When to use it

• Convert a scripted Markdown outline into a ready-to-share vertical short video.
• Automate production of narrated slide-style videos for social platforms.
• Batch-produce videos when you have consistent layout and pacing requirements.
• Quickly prototype short video content without manual editing tools.
• Combine with external TTS or image generation workflows for custom voices or visuals.

Best practices

• Write clear, short segments in the script so each card and TTS clip remains concise.
• Name pre-made images as slide_01.png, slide_02.png… to match script order when using --images-dir.
• Test TTS command templates locally before batch runs to confirm placeholders {text}, {output}, {voice}, {rate}.
• Keep subtitle text short and use explicit \n for line breaks to control card layout.
• Use --keep-temp during debugging to inspect intermediate images and audio files.

Example use cases

• A marketing short with a title card, three feature cards, and a CTA ending.
• Educational micro-lessons where each script segment covers a single concept.
• Repurposing blog posts into vertical videos by converting sections into script segments.
• Rapid A/B testing of voice and subtitle styles by swapping TTS commands or images.
• Archiving script-to-video outputs for batch backups or automated publishing pipelines.