> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# SaveWEBM - ComfyUI Built-in Node Documentation

> The SaveWEBM node saves a sequence of images as a WEBM video file.

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 the 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.

**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 |

> 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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