BriaVideoReplaceBackground - ComfyUI Built-in Node Documentation - ComfyUI

This node replaces the background of a video with a supplied image or video using Bria’s API. The output keeps the foreground video’s resolution and frame rate; a background with a different aspect ratio is stretched to fit, so matching aspect ratios produces undistorted results.

Inputs

Parameter	Description	Data Type	Required	Range
`video`	Foreground video whose background is replaced.	VIDEO	Yes	-
`background_image`	Background image to composite behind the foreground. Provide either a background image or a background video, not both.	IMAGE	No	-
`background_video`	Background video to composite behind the foreground. Provide either a background image or a background video, not both.	VIDEO	No	-
`seed`	Seed controls whether the node should re-run; results are non-deterministic regardless of seed. (default: 0)	INT	Yes	0 to 2147483647

Note: You must provide exactly one of background_image or background_video — not both and not neither. The foreground video and the background video (if used) must each be 60 seconds or shorter. When background_image is used, its alpha channel is removed before processing.

Outputs

Output Name	Description	Data Type
`video`	The resulting video with the background replaced, encoded as MP4 (H.264).	VIDEO

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