"codec is not opened yet" ?

Set your wanted file name in davinci.

In the scene designer keep it like this:

Licenses are offline validated. I have no control over single licenses.

Please post the Voukoder Pro log file or a scene test result from the designer app.

Right! You need a license key for your copy of Voukoder Pro.

For all future reports of this issue. This is a generic error message if something/anything is not correct. Most likely an incorrect encoder or an invalid parameter of it.

There will be a better error reporting in the next version 3.0!

Please send a Voukoder Pro Logfile or a perform a scene test and copy the log here.