If I understand correctly, currently Octane for Unity only supports image file and ORBX file output. It will be super nice if it can output as video directly. How it works is u select the folder contains the rendered files then it will combine the rendered files and put audio if there is audio and finally output as video. The way to get and put the audio are just like how currently Recorder or Timeline functions did that hook the data from Unity play mode or Unity PlayableDirector. So, everything can be done in Unity.