PPT Audio To Video

Use this skill when the source video has narration audio but no usable slide visuals, and the final deliverable should be a slide-based lecture video.

Resolve bundled scripts relative to this skill directory. If the runtime has already opened this SKILL.md, prefer paths like scripts/extract_slide_outline.py and scripts/render_from_timing_csv.py instead of machine-specific absolute paths.

Core workflow

1. Inventory inputs.

   • Confirm which of these exist: audio-only mp4/m4a/mp3/wav, ppt/pptx, pdf, and any pre-rendered slide images.
   • Prefer an existing pdf or image directory for rendering. Treat pptx as the source of slide text and as a fallback for export.

2. Prepare tools.

   • Required for deterministic steps: ffmpeg, ffprobe, pdftoppm.
   • Required for transcription: whisper-cli from whisper-cpp plus a multilingual model such as ggml-small.bin.
   • If only pptx exists and no pdf/images exist, prefer Keynote or PowerPoint export on macOS. Use soffice only as fallback because profile or rendering issues are common.