bytedance-seedance-2-0

name bytedance-seedance-2-0 description Generate cinematic videos with native synchronized audio using ByteDance Seedance 2.0 (Fast) via EachLabs. Supports text-to-video (bytedance-seedance-2-0-text-to-video-fast) and image-to-video (bytedance-seedance-2-0-image-to-video-fast). Use when the user specifically asks for Seedance 2.0, wants native audio with the video, realistic physics, director-level camera control, or 4–15 second clips up to 720p. metadata {"author":"eachlabs","version":"1.0"} ByteDance Seedance 2.0 (Fast) ByteDance Seedance 2.0 on the EachLabs Predictions API. Seedance 2.0 generates cinematic video with native synchronized audio (sound effects, ambient sound, lip-synced speech), realistic physics, and director-level camera control. Two model slugs: Slug Category Use bytedance-seedance-2-0-text-to-video-fast Text to Video Generate a video from a prompt bytedance-seedance-2-0-image-to-video-fast Image to Video Animate a starting frame (optionally to an end frame) The "Fast" tier prioritizes rapid turnaround for high-throughput pipelines while keeping the family's character consistency and physics. When to use User asks for "Seedance 2.0", "ByteDance video", or wants a Seedance-style look. Native audio required in the same pass (dialogue, SFX, ambience) — no separate TTS/lipsync step. Cinematic motion, realistic physics, or director-level camera language ("slow push in", "rack focus"). Durations of 4–15 seconds at 480p or 720p. Image-to-video with an end frame to control where the clip lands. For a wider video-model comparison (Veo, Kling, Sora, Pixverse, Hailuo, etc.) see eachlabs-video-generation . Authentication Header: X-API-Key: <your-api-key> Set the EACHLABS_API_KEY environment variable. Get your key at eachlabs.ai/dashboard/api-keys . Prediction Flow (Recommended) Check schema — GET https://api.eachlabs.ai/v1/model?slug=bytedance-seedance-2-0-text-to-video-fast (or the i2v slug). POST https://api.eachlabs.ai/v1/prediction with model , version: "0.0.1" , and input . Poll GET https://api.eachlabs.ai/v1/prediction/{id} until status is "success" or "error" , or use a webhook. Extract the video URL from output (string). Quick Start — Text to Video curl -X POST https://api.eachlabs.ai/v1/prediction \ -H "Content-Type: application/json" \ -H "X-API-Key: $EACHLABS_API_KEY " \ -d '{ "model": "bytedance-seedance-2-0-text-to-video-fast", "version": "0.0.1", "input": { "prompt": "Cinematic slow push-in on a lone astronaut standing at the edge of a Martian canyon at dusk, dust drifting across their boots, distant wind, subtle helmet reflections", "resolution": "720p", "duration": "6", "aspect_ratio": "16:9", "generate_audio": true } }' Typical processing time: ~120 seconds . Quick Start — Image to Video curl -X POST https://api.eachlabs.ai/v1/prediction \ -H "Content-Type: application/json" \ -H "X-API-Key: $EACHLABS_API_KEY " \ -d '{ "model": "bytedance-seedance-2-0-image-to-video-fast", "version": "0.0.1", "input": { "prompt": "Camera slowly pushes from wide to medium close-up as the lion roars at golden hour. Warm amber light rakes across the mane. Narrator (weathered British male, 50s): \"He has ruled this land for seven years.\"", "image_url": "https://your-cdn.example.com/lion.jpg", "resolution": "720p", "duration": "8", "aspect_ratio": "16:9", "generate_audio": true } }' Typical processing time: ~150 seconds . Start-to-end transition Pass end_image_url to lock the final frame and let the model interpolate motion between the two: { "model" : "bytedance-seedance-2-0-image-to-video-fast" , "version" : "0.0.1" , "input" : { "prompt" : "Smooth parallax zoom through the scene, crossfading into the second look" , "image_url" : "https://your-cdn.example.com/frame-start.jpg" , "end_image_url" : "https://your-cdn.example.com/frame-end.jpg" , "duration" : "6" , "resolution" : "720p" } } Polling curl https://api.eachlabs.ai/v1/prediction/{PREDICTION_ID} \ -H "X-API-Key: $EACHLABS_API_KEY " Status Meaning processing Still running — poll again success Done — read output (video URL) error Failed — read message / details Webhook (alternative to polling) Pass "webhook_url": "https://your.host/path" in the create body. EachLabs POSTs: { "exec_id" : "prediction-uuid" , "status" : "succeeded" , "output" : "https://..." , "error" : "" } status is "succeeded" or "failed" . Return 2xx within 30 seconds. Parameters (both slugs share most of these) Parameter Type Required Default Options Description prompt string Yes — — Text prompt. For i2v, describes the motion/action; supports timeline prompting and dialogue lines for native audio. image_url string Yes (i2v only) — JPEG / PNG / WebP, max 30 MB Starting frame. Publicly reachable HTTPS URL. end_image_url string No (i2v only) — JPEG / PNG / WebP, max 30 MB Final frame; model interpolates between image_url and this. resolution string No 720p 480p , 720p 480p = faster/cheaper, 720p = balanced. duration string No auto auto , 4 … 15 Clip length in seconds. auto lets the model pick from the prompt. aspect_ratio string No auto auto , 21:9 , 16:9 , 4:3 , 1:1 , 3:4 , 9:16 For i2v, auto infers from the input image. generate_audio boolean No true — Synchronized SFX, ambience, and lip-synced speech. Cost is the same whether on or off. seed string No — — Reproducibility hint — results may still drift slightly. end_user_id string No — — Your end-user identifier. Pricing Dynamic, charged per second of output video : Resolution Rate 480p $0.1129 / second 720p (default) $0.2419 / second Audio generation does not change cost. A 6-second 720p clip ≈ $1.45; a 10-second 480p clip ≈ $1.13. Prompt Tips Timeline prompting : sequence beats with time or cut words — "Wide shot: … Cut to close-up: … Finally: …". Seedance 2.0 respects temporal structure better than single-sentence prompts. Dialogue with native audio : write the line in quotes and describe the speaker ("Weathered British male narrator, 50s, calm authoritative voice, says: …"). Lip-sync and ambience are generated in the same pass. Camera language : use real film vocabulary ("slow push-in", "rack focus", "dolly left", "handheld", "crane up"). The model follows director-level cues. Physics cues : mention weight, momentum, and material interactions ("dust scatters as boot lands", "fabric settles after the spin") to unlock the realistic-physics behavior. Rate Limits & Limits Limit Value Create requests 100 / minute per key Concurrent predictions 10 per key File inputs Publicly reachable HTTPS URLs only (JPEG/PNG/WebP, max 30 MB). No data-URIs, no localhost. Errors Error body: { "status": "error", "message": "...", "details": "..." } Code Meaning 400 Invalid input 401 Missing / invalid X-API-Key 404 Unknown model or prediction id 429 Rate limited — back off 5xx Retry with exponential backoff Security Constraints No arbitrary URL loading : image_url / end_image_url must point to your own HTTPS-reachable storage (S3, GCS, CDN). Do not forward user-pasted URLs without validation. No third-party API tokens : never forward provider tokens through input — authentication is exclusively via the EachLabs API key. Validate before calling : resolve the live request_schema via GET /v1/model?slug=<slug> before constructing input . Parameter Reference See references/MODELS.md for the full per-slug table with defaults and options.