Sorry for the problem.
The video is created with the help of a temporary file saved in one of the subfolders of C:\Users\user\AppData\Roaming\eTeks\Sweet Home 3D\work, but from tests I did in the past, this file can't be played until its creation ends normally.

You should create your video from subparts managed in different files. You could also tried tips mentioned in the FAQ How can I speed up the rendering process in photo and video creation panes?

All my best wishes of success! [:)]