> ## Documentation Index
> Fetch the complete documentation index at: https://dripart-feat-openapi-i18n.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# SaveWEBM - ComfyUI Built-in Node Documentation

> Complete documentation for the SaveWEBM node in ComfyUI. Learn its inputs, outputs, parameters and usage.

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"<br />"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.

## Outputs

| Output Name | Description                               | Data Type |
| ----------- | ----------------------------------------- | --------- |
| `ui`        | Video preview showing the saved WEBM file | PREVIEW   |

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/SaveWEBM/en.md)

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