What problem does it solve? Turning an edited timeline into a deliverable final video requires many fragile ffmpeg steps—normalization, concatenation, overlay compositing, subtitle burning, and BGM mixing—where a silent failure or a bad intermediate can produce a broken export that looks finished. ## Core Features & Use Cases - Five-stage render pipeline: Normalizes every clip to 1920x1080 / 30fps / yuv420p / 48kHz stereo, concatenates segments, composites annotation overlays, burns or exports subtitles, and mixes background music. - Machine-verified quality gates: Each stage leaves machine-checkable criteria and the final duration is verified with ffprobe against the timeline calculation, never trusting exit codes alone. - Incremental re-export: When only one narration line or segment changes, only the affected stages re-run while the rest reuse cached intermediates. - Use Case: A user clicks "Export" in the workbench; the Skill claims the queued request, renders the episode through all five stages, verifies the result with ffprobe, and reports the final MP4 path. ## Quick Start Export the current project timeline to a final 1080p MP4 with background music and verify the result with ffprobe.
