reel-builder_skill

Overview

This skill builds multi-scene animated reels from AI-generated images using Fal.ai tools and ffmpeg. It produces a style-consistent set of stills, morphs scenes using Kling start/end frame interpolation, and assembles a normalized final video ready for vertical platforms. The pipeline is optimized for Instagram Reels, TikTok, Shorts, or any short-form multi-shot content.

How this skill works

Generate an anchor image that establishes the visual style, then produce matching scene images with Kontext Max (or flux-general as fallback). For each scene transition, submit a Kling start/end interpolation job that morphs Scene N into Scene N+1 with a short motion prompt. Normalize clip dimensions with ffmpeg, concatenate clips, and add text overlays after assembly.

When to use it

• Creating vertical reels (9:16) with consistent character or art style
• Converting a storyboard into smooth animated transitions without frame-by-frame animation
• Producing short multi-shot promotional or narrative videos from AI images
• Rapidly iterating on social video concepts with low cost per reel

Best practices

• Always generate an explicit anchor image in the target aspect ratio (e.g., 768x1344 for 9:16).
• Use Kontext Max with the anchor image for style/character consistency; fall back to flux-general with reference_strength 0.7 if Kontext times out.
• For Kling transitions, prompt the CHANGE between frames (1–2 actions per 5s clip) rather than re-describing both frames.
• Normalize every Kling output to 1080x1920 via ffmpeg before concatenation to avoid mismatched resolutions.
• Do not bake text into images or Kling prompts; add overlays after assembly using ffmpeg or an editor.

Example use cases

• A 5-scene children’s story reel with consistent watercolor characters and smooth scene morphs.
• A product demo reel that shifts from product close-ups to lifestyle scenes with fluid transitions.
• A marketing short that stitches multiple mood shots into a single vertical video for Instagram/TikTok.
• Batch-generate multiple short variations of the same storyboard for A/B testing ad creatives.