Replace Video in Template

In this guide, we will learn how to replace videos within a template and generate a video.

Video Properties:

  • url: URL of the image content.
  • asset_id: Asset ID of the image content.
  • play_style: Video playback style, options: fit_to_scene, freeze, loop, once. More Info
  • fit: Adjustment of image or video to fit in a area, options: cover, contain, crop, or none. More Info

Creating Template through the Interface

To create templates, visit HeyGen Template page and click on Create Template. You can then set variables and change variable names using the toolbar's API icon.

As you can see, we have assigned a variable name to our video element. In this tutorial, we will demonstrate how to change this video using the Template API.

Get a List of Your Templates

See detailed API reference
Using the following API request you will get a list of your templates that you have created in the HeyGen interface, obtain your template_id from here.

curl --location 'https://api.heygen.com/v2/templates' \
     --header 'accept: application/json' \
     --header 'x-api-key: <your-api-key>'
{
  "error": null,
  "data": {
    "templates": [
      {
        "template_id": "<template_id>",
        "name": "<name>",
        "thumbnail_image_url": "<thumbnail_image_url>"
      },
      ...
    ]
  }
}

Retrieve Video Elements

See detailed API reference
To retrieve video elements for a specific template, use this API request. Get the variable you want to change from here.

curl --location 'https://api.heygen.com/v2/template/<template_id>' \
     --header 'accept: application/json' \
     --header 'x-api-key: <your-api-key>'
{
  "error": null,
  "data": {
    "variables": {
      "shopping_video": {
        "name": "shopping_video",
        "type": "video",
        "properties": {
          "url": "<url>",
          "asset_id": null,
          "play_style": "loop",
          "fit": "none"
        }
      }
    }
  }
}

Modify Template Elements and Generate Video

See detailed API reference
To change template elements and generate videos, you will need to submit an API request as follows. In the request body, specify the elements you want to modify by providing the appropriate object within the variables section.

curl --location 'https://api.heygen.com/v2/template/<template_id>/generate' \
     --header 'X-Api-Key: <your-api-key>' \
     --header 'Content-Type: application/json' \
     --data '{
  "test": true,
  "caption": false,
  "title": "New Video",
  "variables": {
    "shopping_video": {
      "name": "shopping_video",
      "type": "video",
      "properties": {
        "url": "https://files.heygencdn.com/prod/movio/preset/video/origin/0aec3387a37c43f1abd463378d261f3c.mp4",
        "asset_id": null,
        "play_style": "loop",
        "fit": "contain"
      }
    }
  }
}'
{
  "error": null,
  "data": {
    "video_id": "<video_id>"
  }
}

You will receive a video_id after your request. To check the video's status and retrieve further details, you can use the video_status API endpoint.

And using the Template API, we changed our image and generated our new video, here is the before and after:

Conclusion

In this guide, we've walked you through the process of replacing videos within a template video using HeyGen's Template API. By following the steps outlined here, you can seamlessly modify video elements to create customized videos that suit your specific needs.