Video Enhance v3.1.5, No Video, Sound Only!?

I did a search at this community for any similar issues, but I didn’t see anything from the search results that I checked.

Doing a test enhancement on a 407 MB MP4 video using Theia details/fidelity model with output set as H.265 Main nVidia MP4 container.

Processing took around 16 hours with an output video file size of only ~54 MB!

Played the output file on several different media players with the result that there is no video at all!? There is only sound being played, which seems to be fine BTW.

What happened to the video (imagery)?