hey all,
i just discovered a feature hidden in Windows 10 that let's you record the output of Resolume (or any other software) in a very convenient way.
click on the output window and hit Windows + G to open the"XBox Game Bar"
it will ask you if this application is a game. click the checkbox and you find a recording button. click record (or Windows + Alt + R) to record.
It will record the output to a mp4 file into the folder Videos/Capture
enjoy!