---
title: "Use video overlay to check accuracy"
canonical: "https://help.vicon.com/space/ShogunPost121/1253736947/Use%20video%20overlay%20to%20check%20accuracy"
format: markdown
---
If your system includes Vicon video cameras, you can check your data accuracy by comparing optical capture data with supported video data. You do this by overlaying the 3D data onto the video (.*vvid* or .*mov*) data.

Shogun Post supports the following types of video files:

- .*vvid* files captured from Vicon Shogun Live using Vicon Vue cameras
- .*mov* files that have been transcoded using Shogun Post or the standalone ViconVideoConverter tool (a command line tool that is installed with Vicon Video Viewer, by default to *C:\Program Files\Vicon\ViconVideoViewer*).

**To overlay 3D data onto video files in Shogun Post:**

1. Ensure that the video files are in the same folder as the required 3D data (.*x2d* or .*mcp*) file. If a different path was defined during capture (often an SSD per pair of cameras), use the batch transcoding feature of Shogun Post to ensure the files are moved to the correct location. For more information, see [Transcode video files](https://vicon-help.atlassian.net/wiki/spaces/ShogunPost121/pages/1253737080).  
:check_mark: **Tip**: If video files are kept in a different folder from the 3D data files, when you load an .* x2d *or . *mcp *file, Shogun Post warns you that the video files cannot be located. To manually specify the video file path, in the **Selection **panel (or **3D Scene** view) select the video camera, then in the **Attributes **panel, expand the **Video (Offline) **section and set its **Video_File **attribute to the path of the file. This change is saved when you save the scene in Shogun Post.
2. Open the .*x2d* or .*mcp* file (either from the **Data Management** panel, or click **Import** on the **File** menu, or drag and drop the relevant file from Windows Explorer, as described in [Load mocap data files into Shogun Post](https://vicon-help.atlassian.net/wiki/spaces/ShogunPost121/pages/1253739058)).
  The video files are automatically loaded.
3. In the **Selection** panel, expand the **System** node and click the required camera.
4. At the top left of the view pane, click the current View type button, and then click **Cameras**.
5. At the top of the **Cameras** view, select **View Filters**.
6. Ensure the **3D** check box is selected.
7. The video for each Vicon video camera is displayed in a 3D overlay.  
Video is in black and white or color, depending on the video camera used.
8. To see the image plane of the camera corrected for lens distortion, select **Distort 3D**.
  The 3D overlay should line up with the subject in the **Cameras** view and the grid should line up with the floor.  
You can zoom and pan the video using normal **Cameras** view controls.  
You can select or clear the **View Filters** to control which 3D elements are displayed.