First, select your video source from the source dropdown menu.
If you are using a webcam, you're done. Simply go live and you should see your camera.
If you are using an external capture card, click on the Input Source button that appears to the right of the camera source dropdown menu.
You will need to select the correct input source and video resolution for Livestream Producer to recognize video coming from that video source.
Getting a 'Lost Signal' message when you go live? See here for troubleshooting steps.
Once the correct source is selected, a preview will appear in the video input preview at the top of the menu.
The audio input source(s) can be further configured through Producer’s audio mixer (Preferences > Audio > Open Audio Mixer).