> ## 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.

# ByteDanceFirstLastFrameNode - ComfyUI Built-in Node Documentation

> This node generates a video using a text prompt along with first and last frame images.

This node generates a video using a text prompt along with first and last frame images. It takes your description and the two key frames to create a complete video sequence that transitions between them. The node provides various options to control the video's resolution, aspect ratio, duration, and other generation parameters.

## Inputs

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `model` | The model used for video generation (default: `"seedance-1-5-pro-251215"`). | COMBO | Yes | `"seedance-1-5-pro-251215"`<br />`"seedance-1-0-pro-250528"` |
| `prompt` | The text prompt used to generate the video. Must not be empty and must not contain reserved parameter keywords (`resolution`, `ratio`, `duration`, `seed`, `camerafixed`, `watermark`). | STRING | Yes | - |
| `first_frame` | First frame to be used for the video. Must be between 300x300 and 6000x6000 pixels, with an aspect ratio between 0.4 and 2.5. | IMAGE | Yes | - |
| `last_frame` | Last frame to be used for the video. Must be between 300x300 and 6000x6000 pixels, with an aspect ratio between 0.4 and 2.5. | IMAGE | Yes | - |
| `resolution` | The resolution of the output video. | COMBO | Yes | `"480p"`<br />`"720p"`<br />`"1080p"` |
| `aspect_ratio` | The aspect ratio of the output video. | COMBO | Yes | `"adaptive"`<br />`"16:9"`<br />`"4:3"`<br />`"1:1"`<br />`"3:4"`<br />`"9:16"`<br />`"21:9"` |
| `duration` | The duration of the output video in seconds. When using `seedance-1-5-pro-251215`, the minimum duration is 4 seconds. (default: 5) | INT | Yes | 3 - 12 |
| `seed` | Seed to use for generation. (default: 0) | INT | No | 0 - 2147483647 |
| `camera_fixed` | Specifies whether to fix the camera. The platform appends an instruction to fix the camera to your prompt, but does not guarantee the actual effect. (default: False) | BOOLEAN | No | - |
| `watermark` | Whether to add an "AI generated" watermark to the video. (default: False) | BOOLEAN | No | - |
| `generate_audio` | This parameter is ignored for any model except `seedance-1-5-pro-251215`. (default: False) | BOOLEAN | No | - |

**Note:** For the `seedance-1-5-pro-251215` model, `duration` must be 4 seconds or greater. Both `first_frame` and `last_frame` must be between 300x300 and 6000x6000 pixels and have an aspect ratio between 0.4 and 2.5. The `prompt` is checked and rejected if it contains reserved parameter keywords.

## Outputs

| Output Name | Description | Data Type |
| - | - | - |
| `output` | The generated video file. | VIDEO |

> 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/ByteDanceFirstLastFrameNode/en.md)

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