After successfully rendering and encoding VR videos with Voukoder for a while, my attempts would instantly fail starting about a month ago. I didn't put any effort into solving the issue then, but I've looked at it again recently.
I realized that clearing the video side data fields allowed the video to render. Adding any video side data causes the render to immediately fail. Here is AME's log for a failed render attempt.
I enabled logging in Voukoder and this is what it says on a failed render attempt. Low-level logging is enabled.
Simply disabling all video side data options allows the render to proceed. I first noticed this issue with one of the Voukoder 9 release candidates, but I just installed 9.1 and it's still happening so I decided to report it.