Visualization issue

[hanhongxiaozhanggui]

Hello, when I use the visualization tool in the toolbox, I find that I can't see the video frame, and the spectrogram is different from the example.Then,when I select different files for visualization and switch about three times, I can no longer switch chunks.How should I solve this issue?

[yahskapar]

This should be fixed as soon as #323 is reviewed and merged. Thanks for pointing this out, and please create a new issue if somehow that gets merged and this issue persists for you.