Request Parameters

metadata generation parameters, supported resolution and duration ranges, and reference asset count limits.

metadata Parameters

Parameter	Type	Description
`resolution`	string	Output resolution, e.g. `480p` / `720p` / `1080p`
`duration`	number	Video duration (seconds)
`ratio`	string	Aspect ratio, e.g. `16:9` / `9:16` / `1:1` / `4:3` / `3:4` / `adaptive`
`seed`	number	Random seed; the same seed improves result consistency
`fps`	number	Frame rate
`generate_audio`	boolean	Whether to generate audio
`enhance`	boolean	Whether to enable quality enhancement
`return_last_frame`	boolean	Whether to return the last frame image
`watermark`	boolean	Whether to add a watermark
`reference_mode`	string	Reference mode, controlling how reference assets are used
`audio_urls`	array	List of audio URLs

Supported Resolutions and Durations

Model	Resolution	Duration (seconds)
`doubao-seedance-2-0-260128`	480p / 720p / 1080p	5 / 10
`doubao-seedance-2-0-fast-260128`	480p / 720p / 1080p	5 / 10
`doubao-seedance-2-0-mini-260615`	480p / 720p	5
`doubao-seedance-2-5-260628`	720p / 1080p	5 / 8 / 10

Combinations outside the table above are rejected. 2.5 is stronger in framing control and reference consistency, while the 2.0 series has advantages in longer durations and cost.

Key Differences Between 2.0 and 2.5

Capability	2.0 Series	2.5
Audio generation	Supported	Supported (better quality)
Reference asset combinations	Supported	More combinations supported
Last frame return	Supported	Supported
Framing control	Basic ratios	Supports `adaptive`
Duration tiers	5 / 10	5 / 8 / 10

Reference Asset Count Limits

Type	Limit
Images	30
Videos	10
Audio	10
Total assets	50
content array items	51 (including text)

Assets in the asset library must match the group and channel family of the current api_key. Cross-group asset references are rejected.

metadata Parameters

Supported Resolutions and Durations

Key Differences Between 2.0 and 2.5

Reference Asset Count Limits

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