seedance-2-prompt

Provide a structured English prompt and an output filename, then the script submits a job to the Seedance 2.0 API, polls until completion, and downloads the MP4. The default provider is OpenRouter using the bytedance/seedance-2.0 model.

OpenRouter uses a flat prompt field and returns a polling URL with the video in unsigned_urls, while Volcengine ARK and BytePlus pack inputs into a content array and return a job id polled at a constructed task URL. Both are normalized into one CLI contract selected with the provider option.

Yes, pass the same reference image as input_reference to every shot to anchor identity and style without locking the frame. Use input_image only when you need a specific literal first frame, and repeat the character's full description in each prompt.

Durations range from 3 to 15 seconds, with 3-second requests generated as 4 seconds and trimmed locally. Supported aspect ratios are 9:16, 16:9, 1:1, 4:3, 3:4, and 21:9, with resolutions of 480p, 720p, or 1080p on the Volcengine path.

Generate individual segments of 15 seconds or less, ending each on a stable handoff frame, then extend the previous output or stitch segments with a video-merger skill. Each segment should carry forward identity, outfit, lighting, and camera style.

Provider policy rejections typically come from franchise names, brand terms, or recognizable character likenesses in the prompt or reference images. The script stops immediately, writes a sanitized failure sidecar with the policy code, and never retries a paid submission automatically.