How to eliminate the "No Sources" warning when doing audio only recordings?

[Arilando]

I want to do some audio only recordings, therefore i have only added an audio source. Every time i want to start a recording i get a "No Sources" warning warning me i should add a video sources. This is extremely annoying as it mean i need to click twice in order to start a recording. How do i make this warning go away when doing audio only recordings?

 

[Suslik V]

Add to Sources pane Color Source (of solid black color) or empty Text (GDI+) source.

 

[PaiSand]

OBS is for recording / streaming video and audio, not just audio. If you only need to record audio you can use Audacity which is perfect for audio recording, and it's also free.