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# SamplerARVideo - ComfyUI Built-in Node Documentation

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

> 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/SamplerARVideo/en.md)

The Sampler AR Video node provides a specialized sampling method for autoregressive video models, such as those using Causal Forcing or Self-Forcing techniques. It manages all parameters related to the autoregressive (AR) loop directly within the workflow, making it easy to configure how the model generates video frames one step at a time.

## Inputs

| Parameter             | Data Type | Required | Range   | Description                                                                                                                                                                                                                                           |
| --------------------- | --------- | -------- | ------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `num_frame_per_block` | INT       | Yes      | 1 to 64 | Frames per autoregressive block. A value of 1 means the model generates one frame at a time (framewise), while a value of 3 means it generates three frames together (chunkwise). This setting must match the checkpoint's training mode. Default: 1. |

## Outputs

| Output Name | Data Type | Description                                                                                                           |
| ----------- | --------- | --------------------------------------------------------------------------------------------------------------------- |
| `SAMPLER`   | SAMPLER   | A configured sampler object that uses the "ar\_video" sampling function with the specified autoregressive parameters. |

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