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Architecture

StoryCast is deliberately opinionated: one user topic in, one pitch-ready short film out.

System Diagram

flowchart TD
    A[User topic] --> B[Seed 2.0 director]
    B --> C[Structured story blueprint]
    C --> D[Seedream 5.0 scene keyframe]
    C --> E[Seed Speech scene narration]
    C --> F[Seedance 2.0 scene motion prompt]
    D --> F
    E --> G[ffmpeg scene mux]
    F --> G
    G --> H[ffmpeg final concat]
    H --> I[Final StoryCast mp4]
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Runtime Contract

Every run produces a directory under runs/<timestamp>-<topic-slug>/.

Each scene emits four artifacts:

  • scene_XX.png: Seedream keyframe.
  • scene_XX.mp3: Seed Speech narration.
  • scene_XX.mp4: raw Seedance clip.
  • scene_XX_muxed.mp4: scene clip with audio.

The run also emits:

  • blueprint.json: Seed 2.0 story plan.
  • manifest.json: run metadata, scene assets, and final output path.
  • storycast_final.mp4: stitched deliverable.

Why The Architecture Scores Well

  • The agent work is explicit. Judges can see orchestration, not just generation.
  • Every BytePlus Seed tool has a visible role in the pipeline.
  • The manifest makes the system explainable during a live demo.
  • Scene-level artifacts allow iterative debugging if one clip is weak.

Defaults Chosen For Demo Quality

  • seed-2-0-pro-260328 for stronger scene planning and tighter narrative structure.
  • seedream-5-0-260128 for richer storyboard panels.
  • dreamina-seedance-2-0-260128 for flagship clip quality.
  • 720p output to stay cost-aware while preserving a polished look.

Switch the model IDs in .env if you want a faster iteration loop during rehearsal.