XnView Software

It would be very useful to have size info concerning video files, e.g.:
settings/browser/thumbnail/labels tab./custom label/video>height/video>width
or something like that.
Regards

No, you'll need some samples without black frames to reproduce.
Just carefully read the message from thany2.
These files will do:
https://file-examples.com/index.php/sam ... mp4-files/
Download them.

Regards

Yes

Just two notes:
Preview window should be detached.
The bug also affects Win7.
Cheers