# Unsupported video codec detected

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<figure><img src="/files/HbVmnio4ZoRfxAV6trBi" alt=""><figcaption></figcaption></figure>

### Explanation

This error message arises when loading video data. It indicates that the videos files from the selected trial were written using an unsupported video file codec.

### Possible Solutions

Theia3D requires video files to be encoded using certain supported video codecs. If the videos you are trying to load were encoded with an unsupported codec, they cannot be loaded by Theia3D. When this error is encountered, the best solution is to re-export the videos in a supported codec, or to convert the existing videos to a supported codec.

For OptiTrack Prime Color cameras, verify that you have selected the correct video export settings, particularly ***Video Format: MJPEG***. If the incorrect video format was selected, the video files may not be written using a video codec supported by Theia3D and will need to exported from Motive again, in the proper format.

<figure><img src="https://cdn.prod.website-files.com/67008ba73b4fd0346790d085/67457bd81489a52c22db0819_opti_exportsettings.png" alt="_images/opti_exportsettings.png"><figcaption></figcaption></figure>


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