SaveWEBM - ComfyUI Built-in Node Documentation

The SaveWEBM node saves a sequence of images as a WEBM video file. It takes multiple input images and encodes them into a video using either VP9 or AV1 codec with configurable quality settings and frame rate. The resulting video file is saved to the output directory with metadata including prompt information.

Inputs

Parameter	Description	Data Type	Required	Range
`images`	RGBA images are saved with their alpha channel as transparency (vp9 codec only).	IMAGE	Yes	-
`filename_prefix`	Prefix for the output filename (default: “ComfyUI”).	STRING	No	-
`codec`	Video codec to use for encoding.	COMBO	Yes	”vp9" "av1”
`fps`	Frame rate for the output video (default: 24.0).	FLOAT	No	0.01-1000.0
`crf`	Higher crf means lower quality with a smaller file size, lower crf means higher quality higher filesize (default: 32.0).	FLOAT	No	0-63.0

Note on alpha channel: The alpha channel from RGBA images is only preserved when using the VP9 codec. When using the AV1 codec, the alpha channel is ignored and only RGB data is encoded. Note on file naming: Videos are saved to the output directory as {filename_prefix}_{counter:05}_.webm, where the counter automatically increments to avoid overwriting existing files.

Outputs

Output Name	Description	Data Type
`images`	The input images, passed through unchanged after the video is saved.	IMAGE
UI preview	Video preview showing the saved WEBM file.	PREVIEW

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Outputs