> For the complete documentation index, see [llms.txt](https://docs.theiamarkerless.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.theiamarkerless.com/apollo-v2024/troubleshooting/error-messages/videos-not-the-same-length..md).
# Videos not the same length.
### Explanation
This error message arises when loading video data. It indicates that the videos from the selected trial are of unequal lengths.
### Possible Solutions
Theia3D requires videos to be of equal lengths in order to be loaded. If your videos are of different lengths, this usually indicates an issue with your camera hardware setup or settings, or video download settings.For OptiTrack Prime Color cameras, verify that you have selected the correct video export settings, particularly *Dropped Frames: Black Frame*. If *Dropped Frames: Drop Frame* was used, this can result in exported video files being unequal in length, and the videos should be exported again using the correct setting.
---
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