All FreeModel video routes use the same asynchronous workflow. Choose a model from the Video Series sidebar, submit a request, save the returned id, and poll until the task completes.The model page defines the accepted duration, aspect ratio, resolution, image-reference, and source-video rules. Do not send values from one model family to another.
A duration listed on the model page. If you omit it, the task runs for 10
seconds, or for the model’s shortest length when 10 isn’t offered. Models
whose length follows a source clip (gemini-omni-extend,
gemini-omni-flash-1.1-extend) reject seconds.
Up to three public reference audio URLs for Seedance *-r2v models.
Models that bill reference or source video seconds (Seedance *-r2v,
seedance-2.5-extend, and the Seedance 2.5 -v2v SKUs) bill output seconds
plus the length of the clips you send. The gateway measures each MP4 or MOV
clip itself by reading its header with HTTP range requests, so host clips
where range requests work, such as S3, R2, or most CDNs. A clip that cannot
be measured is billed at the model’s maximum reference length.
Optional public https URL. When the task reaches a final state, the
gateway sends it one signed event with the task under data.task. See
Task webhooks.
Poll every 10 to 20 seconds while status is queued or in_progress. Download only after status becomes completed.
Task status API
Query the normalized task record and final media URLs.
Webhooks
Receive the final task result without continuous polling.
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