> ## 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.

# Topaz Starlight Precise 2.5 - AI video upscaling

> Upscale videos with Topaz Starlight Precise 2.5 in ComfyUI: sharper 4K output with reduced artifacts for live-action footage

Topaz Starlight Precise 2.5 is a video upscaling model available in ComfyUI through the Topaz partner nodes. It upscales MP4 videos up to 4K resolution with sharper output and fewer artifacts. The workflow accepts MP4 input and produces enhanced MP4 output.

<Tip>
  To use the Partner Nodes, you need to ensure that you are logged in properly and using a permitted network environment. Please refer to the [Partner Nodes Overview](/tutorials/partner-nodes/overview) section of the documentation to understand the specific requirements for using the Partner Nodes.
</Tip>

<Tip>
  <Tabs>
    <Tab title="Local users">
      Make sure your ComfyUI is updated.

      * [Download ComfyUI](https://www.comfy.org/download)
      * [Update Guide](/installation/update_comfyui)

      Workflows in this guide can be found in the [Workflow Templates](/interface/features/template).
      If you can't find them in the template, your ComfyUI may be outdated.

      If nodes are missing when loading a workflow, possible reasons:

      1. You are not using the latest ComfyUI version (Nightly version)
      2. Some nodes failed to import at startup
    </Tab>

    <Tab title="Cloud users">
      * [Cloud](https://cloud.comfy.org) will update after ComfyUI stable release.

      So, if you find any core node missing in this document, it might be because the new core nodes have not yet been released in the latest stable version. Please wait for the next stable release.
    </Tab>
  </Tabs>
</Tip>

## Topaz Starlight Precise 2.5

Upscale a video to sharper, higher-resolution output with the Starlight Precise 2.5 model. This workflow upscales MP4 videos up to 4K with sharper output and fewer artifacts.

<video controls className="w-full aspect-video" src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/thumbnail/api_topaz_starlight_precise25.mp4" />

<CardGroup cols={2}>
  <Card title="Run on Comfy Cloud" icon="cloud" href="https://cloud.comfy.org/?template=api_topaz_starlight_precise25&utm_source=docs&utm_medium=referral&utm_campaign=topaz-starlight-precise-2-5">
    Open in Comfy Cloud
  </Card>

  <Card title="Download Workflow" icon="download" href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/api_topaz_starlight_precise25.json">
    Download JSON or search "Topaz Starlight Precise 2.5" in Template Library
  </Card>
</CardGroup>

<details className="prose" style={{marginBottom:"1rem"}}>
  <summary>Input materials</summary>

  Download this sample input video to try the workflow:

  <CardGroup cols={1}>
    <Card title="Input video: running_horse.mp4" icon="video" href="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/input/running_horse.mp4">
      A horse running clip used as the base video
    </Card>
  </CardGroup>
</details>

### Workflow overview

This workflow uses three nodes:

* **LoadVideo**: provides the source video
* **TopazVideoEnhanceV2**: the core node, configured with the `Starlight Precise 2.5` upscaler model
* **SaveVideo**: saves the enhanced video

### Steps to run

1. **Load a video**: connect your MP4 video to the **LoadVideo** node
2. **Select the upscaler**: keep `Starlight Precise 2.5` on the **TopazVideoEnhanceV2** node
3. **Set resolution**: `FullHD (1080p)` or `4K (2160p)`
4. **Click Queue**: press `Ctrl+Enter` to generate

## Get started

1. Update ComfyUI to the latest version
2. Go to Template Library, search for `Topaz Starlight Precise 2.5`