Is there an existing issue for this?

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Bug description

Hello there !
I'm trying to use DeepLabCut and I'm very new to all this, but I fell upon a minor issue with the app. When trying to load some videos from a directory, DLC did not seem to detect my videos. I found the answer to my question here : https://forum.image.sc/t/video-files-not-appearing-when-creating-new-project-in-gui/85614
TL;DR : when mp4 videos have their extension in uppercase (".MP4" instead of ".mp4"), DLC does not find them.

But as mentionned in this forum, shouldn't this case be handled in the code, and should be easy to fix ?

Operating System

WSL Ubuntu

DeepLabCut version

3.0.0rc5

DeepLabCut mode

multi animal

Device type

GeForce 3060 RTX (laptop version)

Steps To Reproduce

1. Install DLC using the official guide (conda)
2. Start DLC in the environment created during the install
3. Click on "create a new project"
4. Try to load mp4 files with uppercase extension
5. Videos don't show up

Relevant log output

No response

Anything else?

No response

Code of Conduct

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