> ## Documentation Index > Fetch the complete documentation index at: https://docs.aiohub.org/llms.txt > Use this file to discover all available pages before exploring further. # Get video ยท Vertex AI project path > Check task status, handle failures and find the completed video. Use the same project, location, publisher and model as creation, and pass back the complete `operationName` unchanged. ## Polling and status Replace `` with the full `name` from creation and poll every 10 to 15 seconds: ```bash theme={"system"} curl "https://api.aiohub.org/v1/projects//locations//publishers/bytedance/models/doubao-seedance-2-5-260628:fetchPredictOperation" \ -H "Authorization: Bearer " \ -H "Content-Type: application/json" \ -d '{"operationName": ""}' ``` | Response | Action | | - | - | | `done: false` | Keep polling | | `done: true` with `response` | Download the video | | `done: true` with `error` | Stop polling and read `error.message` | `done: true` means the operation ended, not necessarily that it succeeded. ## Read a successful result Key fields in a successful response: ```json theme={"system"} { "name": "projects//locations//publishers/bytedance/models/doubao-seedance-2-5-260628/operations/task_example", "done": true, "response": { "videos": [ { "gcsUri": "https://api.aiohub.org/v1/videos/task_example/content", "mimeType": "video/mp4" } ] } } ``` `response.videos[0].gcsUri` is an AIOHub HTTPS URL, not a `gs://` object. Download with an HTTP client; Google Cloud Storage is not required. After success, [download the video](/en/api/video-content). ## Failures and retries After a polling disconnect, keep polling the same `name` rather than calling `predictLongRunning` again. Correct fields before retrying a 400. If a terminal operation has `error`, do not read the success response fields. Files remain for 72 hours and task records for 7 days. After a 429 or temporary service error, wait before retrying the read; do not create another task. If a task is missing, check the identifier and the account that owns the API key. ## OpenAPI ````yaml openapi/relay.en.json POST /v1/projects/{project}/locations/{location}/publishers/{publisher}/models/{model}:fetchPredictOperation openapi: 3.0.1 info: title: AIOHub API description: AIOHub public API version: 1.0.0 servers: - url: https://api.aiohub.org security: - BearerAuth: [] tags: - name: List models - name: OpenAI Chat - name: OpenAI Responses - name: Image generation - name: OpenAI Images - name: Video generation - name: Claude Messages - name: Gemini API - name: OpenAI Embeddings - name: Text completions - name: OpenAI Audio - name: Realtime API paths: /v1/projects/{project}/locations/{location}/publishers/{publisher}/models/{model}:fetchPredictOperation: post: tags: - Video generation summary: Get Vertex video task with project path description: > Keep polling while done is false. When done is true, check error first; read error.message on failure and response on success. Task records remain readable for 7 days. Download from response.videos[0].gcsUri, an authenticated HTTPS URL. operationId: getSeedanceVertexVideoWithProject parameters: - name: project in: path required: true description: Project identifier in the client's path. schema: type: string example: my-project example: my-project - name: location in: path required: true description: Location identifier in the client's path. schema: type: string example: us-central1 example: us-central1 - name: publisher in: path required: true description: Model publisher; Seedance examples use bytedance. schema: type: string example: bytedance example: bytedance - name: model in: path required: true description: Full Seedance model name. schema: type: string example: doubao-seedance-2-5-260628 example: doubao-seedance-2-5-260628 requestBody: required: true content: application/json: schema: type: object properties: operationName: type: string description: Pass the complete name from creation unchanged. required: - operationName example: operationName: >- projects/my-project/locations/us-central1/publishers/bytedance/models/doubao-seedance-2-5-260628/operations/task_example responses: '200': description: Current task state; generation failures can also return HTTP 200. content: application/json: schema: $ref: '#/components/schemas/SeedanceVertexOperation' examples: pending: summary: Pending value: name: >- projects/my-project/locations/us-central1/publishers/bytedance/models/doubao-seedance-2-5-260628/operations/task_example done: false succeeded: summary: Succeeded value: name: >- projects/my-project/locations/us-central1/publishers/bytedance/models/doubao-seedance-2-5-260628/operations/task_example done: true response: videos: - gcsUri: >- https://api.aiohub.org/v1/videos/task_example/content mimeType: video/mp4 failed: summary: Failed value: name: >- projects/my-project/locations/us-central1/publishers/bytedance/models/doubao-seedance-2-5-260628/operations/task_example done: true error: message: Video generation failed '400': description: >- Invalid fields, types or model capability. Correct the request using code and message before retrying. content: application/json: schema: $ref: '#/components/schemas/SeedanceTaskError' '401': description: Missing or invalid API key. '404': description: Task not found or not owned by this account. content: application/json: schema: $ref: '#/components/schemas/SeedanceTaskError' security: - BearerAuth: [] components: schemas: SeedanceVertexOperation: type: object properties: name: type: string description: Full operation name. Save the returned value for polling. done: type: boolean description: >- False means pending. True means finished, possibly with a failure; check error. response: type: object properties: '@type': type: string description: Response type. videos: type: array items: type: object properties: gcsUri: type: string description: >- An AIOHub HTTPS download URL, not a gs:// object; authentication is required. format: uri mimeType: type: string enum: - video/mp4 required: - gcsUri - mimeType error: type: object properties: message: type: string description: Generation failure reason. required: - message required: - name - done SeedanceTaskError: type: object description: Error response of the video task endpoints. properties: code: type: string description: Error code example: invalid_duration message: type: string description: Error message example: duration must be between 4 and 30 seconds for this model securitySchemes: BearerAuth: type: http scheme: bearer description: API key (sk-xxx) ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.