Let’s do a sanity check.
Shoot a short clip with your Theta V.
Connect the camera directly to your desktop computer.
Copy the file over.
Stitch the file if necessary with the Ricoh Theta Desktop app.
Run the Theta Movie Converter.
Look at the properties of the converted clip.
(Make sure you have all the latest desktop apps from Theta: https://theta360.com/en/support/download/ )