Seedance·by ByteDanceImage to video

Seedance 2.0 Fast Image-to-Video

Fast video generation from first-frame image (and optional last-frame) with native audio.

Open in workspace →bytedance/seedance-2.0-fast/image-to-video

Parameters

Parameter	Type	Default	Range or options
duration `duration` Video duration in seconds (4-15), or -1 for model to choose automatically.	select	5	-1, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
resolution `resolution` Video resolution.	select	720p	480p, 720p, 720p-SR, 1080p-SR, 1440p-SR
generate audio `generate_audio` Whether to generate synchronized audio.	select	true	true, false
ratio `ratio` Aspect ratio. 'adaptive' matches the first frame image aspect ratio.	select	adaptive	16:9, 4:3, 1:1, 3:4, 9:16, 21:9, adaptive
return last frame `return_last_frame` Whether to return the last frame as a separate image.	select	false	true, false
watermark `watermark` Whether to add a watermark.	select	false	true, false

Files this model takes in addition to the prompt.

Input	Accepts	Max files
First Frame `image`	image	1	Required
Last Frame `last_image`	image	1	Optional

Seedance has no negative_prompt — phrase exclusions as positive constraint phrases at the tail (e.g. “do not generate a watermark”, “keep it subtitle-free”).
There is no negative prompt on this family; write exclusions as positive constraints.
Weight syntax such as (word:1.3) is ignored; it only wastes prompt space.
Keep to at most 4 distinct characters in one prompt.

From LUVI's verified rules for this family.