> ## Documentation Index > Fetch the complete documentation index at: https://www.tella.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Get a source thumbnail or animated preview > Get a thumbnail of a source. If you pass `width`/`height`, the aspect ratio must match the source's native ratio. Omit both to default to the source's native size. ## OpenAPI ````yaml /openapi.json get /v1/videos/{id}/clips/{clipId}/sources/{sourceId}/thumbnail openapi: 3.0.3 info: description: >- The Tella Public API allows you to programmatically access your videos and playlists, including transcripts, chapters, and thumbnails. ## Authentication All requests require a Bearer token in the Authorization header: ``` Authorization: Bearer tella_pk_xxxxx... ``` API keys can be generated in your Tella workspace settings. ## Rate Limiting The API is rate-limited to 100 requests per minute per organization. Rate limit information is returned in response headers: - `X-RateLimit-Limit`: Maximum requests per window - `X-RateLimit-Remaining`: Remaining requests in current window - `X-RateLimit-Reset`: Unix timestamp when the window resets title: Tella Public API version: 1.0.0 servers: - description: Production url: https://api.tella.com security: [] tags: - description: Video operations name: Videos - description: Sections of a video name: Clips - description: Playlist operations name: Playlists - description: Sidebar groups for organizing playlists name: Playlist Groups - description: Tags for categorizing and filtering videos name: Tags - description: Webhook endpoint management name: Webhooks paths: /v1/videos/{id}/clips/{clipId}/sources/{sourceId}/thumbnail: get: tags: - Clips summary: Get a source thumbnail or animated preview description: >- Get a thumbnail of a source. If you pass `width`/`height`, the aspect ratio must match the source's native ratio. Omit both to default to the source's native size. operationId: getSourceThumbnail parameters: - description: Video ID in: path name: id required: true schema: description: Video ID type: string - description: Clip ID in: path name: clipId required: true schema: description: Clip ID type: string - description: Source ID in: path name: sourceId required: true schema: description: Source ID type: string - description: Output format. Defaults to jpg. in: query name: format schema: description: Output format. Defaults to jpg. enum: - jpg - png - webp - gif - mp4 example: jpg type: string - description: Frame offset in ms from the source's start. Defaults to 0. in: query name: inpointMs schema: description: Frame offset in ms from the source's start. Defaults to 0. example: 1000 maximum: 9007199254740991 minimum: 0 type: integer - description: >- Duration of the animated preview in ms. Only valid when format is gif or mp4. in: query name: durationMs schema: description: >- Duration of the animated preview in ms. Only valid when format is gif or mp4. example: 3000 exclusiveMinimum: true maximum: 9007199254740991 type: integer - description: >- Output width in pixels. The thumbnail keeps the source's aspect ratio; a missing side is derived from it. in: query name: width schema: description: >- Output width in pixels. The thumbnail keeps the source's aspect ratio; a missing side is derived from it. example: 1280 exclusiveMinimum: true maximum: 9007199254740991 type: integer - description: >- Output height in pixels. Derived from the source's aspect ratio when omitted. in: query name: height schema: description: >- Output height in pixels. Derived from the source's aspect ratio when omitted. example: 720 exclusiveMinimum: true maximum: 9007199254740991 type: integer - description: Suggest a download disposition on the signed URL. in: query name: download schema: anyOf: - enum: - 'true' type: string - enum: - 'false' type: string description: Suggest a download disposition on the signed URL. - description: >- Set to 'json' to receive `{url}` instead of the default 302 redirect. in: query name: response schema: description: >- Set to 'json' to receive `{url}` instead of the default 302 redirect. enum: - json type: string responses: '200': content: application/json: schema: $ref: '#/components/schemas/ThumbnailResponse' description: Returned when `?response=json` is set '302': description: Redirect to the signed CDN URL '400': content: application/json: example: error: code: bad_request doc_url: https://tella.tv/docs/api-reference/errors#bad-request message: The request was malformed or contained invalid parameters. schema: $ref: '#/components/schemas/ErrorResponse' description: The request was malformed or contained invalid parameters. '401': content: application/json: example: error: code: unauthorized doc_url: https://tella.tv/docs/api-reference/errors#unauthorized message: Authentication is required. Provide a valid API key. schema: $ref: '#/components/schemas/ErrorResponse' description: Authentication is required. Provide a valid API key. '403': content: application/json: example: error: code: forbidden doc_url: https://tella.tv/docs/api-reference/errors#forbidden message: You don't have permission to access this resource. schema: $ref: '#/components/schemas/ErrorResponse' description: You don't have permission to access this resource. '404': content: application/json: example: error: code: not_found doc_url: https://tella.tv/docs/api-reference/errors#not-found message: The requested resource was not found. schema: $ref: '#/components/schemas/ErrorResponse' description: The requested resource was not found. '422': content: application/json: example: error: code: unprocessable_entity doc_url: >- https://tella.tv/docs/api-reference/errors#unprocessable-entity message: The request was well-formed but contained semantic errors. schema: $ref: '#/components/schemas/ErrorResponse' description: The request was well-formed but contained semantic errors. '429': content: application/json: example: error: code: rate_limit_exceeded doc_url: >- https://tella.tv/docs/api-reference/errors#rate-limit-exceeded message: You have exceeded the rate limit. Please slow down. schema: $ref: '#/components/schemas/ErrorResponse' description: You have exceeded the rate limit. Please slow down. '500': content: application/json: example: error: code: internal_server_error doc_url: >- https://tella.tv/docs/api-reference/errors#internal-server-error message: An unexpected error occurred on the server. schema: $ref: '#/components/schemas/ErrorResponse' description: An unexpected error occurred on the server. security: - BearerAuth: [] components: schemas: ThumbnailResponse: additionalProperties: false description: >- Signed CDN URL for the requested thumbnail. Returned only when `?response=json` is set; otherwise the endpoint redirects to the URL with a 302. properties: url: format: uri type: string required: - url type: object ErrorResponse: additionalProperties: false description: Standard error response format properties: error: additionalProperties: false description: Error details properties: code: description: Machine-readable error code enum: - bad_request - unauthorized - forbidden - not_found - unprocessable_entity - rate_limit_exceeded - internal_server_error example: not_found type: string doc_url: description: Link to documentation for this error example: https://tella.tv/docs/api-reference/errors#not-found format: uri type: string message: description: Human-readable error message example: The requested resource was not found. type: string required: - code - message - doc_url type: object required: - error type: object securitySchemes: BearerAuth: description: API key obtained from your Tella account settings scheme: bearer type: http ````