Seedance：動画生成 API

"content": [
  { "type": "text", "text": "草原を走るオレンジ色の猫、カメラが追う" },
  { "type": "image_url", "image_url": { "url": "https://example.com/cat.png" }, "role": "reference_image" },
  { "type": "video_url", "video_url": { "url": "https://example.com/ref.mp4" } },  // role 省略時は reference_video
  { "type": "audio_url", "audio_url": { "url": "https://example.com/ref.mp3" } }   // role 省略時は reference_audio
]

{
  "task": {
    "id": "vtEXAMPLE",
    "model": "dreamina-seedance-2-5-260628",
    "status": "pending",
    "outputs": [],
    "error": null,
    "created_at": "2026-09-23T08:00:00Z",
    "completed_at": null
  }
}

{
  "task": {
    "id": "vtEXAMPLE",
    "model": "dreamina-seedance-2-5-260628",
    "status": "processing",
    "outputs": [],
    "error": null,
    "created_at": "2026-09-23T08:00:00Z",
    "completed_at": null
  }
}

{
  "task": {
    "id": "vtEXAMPLE",                       // HopBase のタスク ID
    "model": "dreamina-seedance-2-5-260628",
    "status": "completed",
    "duration_seconds": 5,                   // 自動の長さのタスクは完了後に読む
    "outputs": ["https://api.hop-base.com/example-signed-video.mp4"],  // 文字列の配列。{url} オブジェクトではない
    "last_frame_url": "https://api.hop-base.com/example-signed-last-frame.jpg",  // 任意。末尾フレームがあるときのみ
    "usage": { "completion_tokens": 1000, "total_tokens": 1000 },  // 任意。金額ではなくトークン数
    "error": null,
    "created_at": "2026-09-23T08:00:00Z",
    "completed_at": "2026-09-23T08:03:10Z"   // 完了前は null
  },
  "usage": { "cost": 3.4, "currency": "CNY", "cost_cny": 3.4, "cost_usd": 0.5 }
}

{
  "task": {
    "id": "vtEXAMPLE",
    "status": "failed",
    "outputs": [],
    "error": { "message": "<English failure reason>" }
  }
}

# 型と値
duration must be an integer                    # priority / execution_expires_after も同様
watermark must be a boolean                    # generate_audio / return_last_frame も同様
Seedance 2.0 duration must be an integer in 4-15 or -1, got 20
Seedance 2.5 duration must be an integer in 4-30 or -1, got 40
model dreamina-seedance-2-0-hc does not support parameter seed   # 拒否フィールド。リクエストしたモデル ID が入ります
model dreamina-seedance-2-0-hc does not support ratio 2:1
model dreamina-seedance-2-0-fast-hc does not support resolution 1080p
request body must not exceed 64MB
priority must be within 0-9, got 10
execution_expires_after must be within 3600-259200 seconds
callback_url must be a valid http(s) URL
safety_identifier must be an ASCII string of 1-64 characters

# content の構造
missing content                                # トップレベルの prompt だけを送った
content[0].image_url must be an object         # image_url を文字列で送った
content[0].type does not support image         # type を image / input_image にした
content[0].text must not be empty
multi-image scenarios must specify first_frame/last_frame or reference_image roles
images in a multimodal reference scenario must set role=reference_image
first/last frame image-to-video cannot be mixed with the multimodal reference scenario
Seedance 2.0 supports at most 9 reference images

# モデルとプラン
domestic doubao-seedance-2-0-fast-260128-a only supports 480p, 720p, got 1080p
model seedream-5-0-pro is an image generation model, use POST /v1/images/generations instead

content[1] media URL returned HTTP 403        # 取得を拒否された(直リンク防止、署名期限切れなど)
content[1] unable to fetch media file, make sure the URL is publicly accessible
content[1] media URL hostname could not be resolved
content[1] media URL must point to a public address, not a private or reserved one
content[1] too many redirects for media URL
content[1] unable to parse media metadata of the video asset   # ファイル破損または形式違い
content[1] media data URL must be base64-encoded
content[1] image data URL does not support MIME type image/svg+xml
    # 許可: image/jpeg png webp bmp tiff gif heic heif; audio/wav audio/mpeg
content[1] reference image width and height must be within 300-6000 px, got 200x200
content[1] video asset duration must be within 2-15 seconds, got 16.000 seconds
total reference video duration must not exceed 15 seconds, got 18.000 seconds

media validation timed out, please retry later

content[1] reference asset is not ready yet, current status is Processing  # 照会を続け、Active になってから送信
content[1] requires a image asset, got Video       # AssetType が image_url / video_url / audio_url と一致しない
content[1] references a retired Seedance 2.5 EP asset; ...  # asset25-* は廃止済み。元の公開 URL を渡す
... cannot be mixed in one task                    # 同じ回に登録した素材だけを参照するか、公開 URL を直接渡す

OutputVideoSensitiveContentDetected / OutputAudioSensitiveContentDetected  # 出力が審査を通過せず。PolicyViolation は著作権
rejected by content moderation                                             # 生成動画・プロンプト・参照素材がコンテンツ審査を通過せず
InputImageSensitiveContentDetected などの Input…Sensitive…                  # 入力素材が審査を通過せず(実在人物のプライバシーを含む)
InvalidParameter / is not valid / missing required / identified your task as  # パラメータまたはタスクモードが不正
task no longer exists                                                        # タスクが存在しない、または削除済み
task expired / timed out / did not finish within 24 hours                     # タイムアウトまたは期限切れ