If you are creating a movie on a Macintosh with Screencast-O-Matic, you’ll need to install a Utility Application called SoundFlowerbed to capture audio with the video.
Download SoundFlowerbed from https://github.com/crmne/Soundflower/releases and install the application.
Once installed, run SoundFlowerbed from Applications. You will not see a user interface when you open the application. Locate the Flower in the menu bar and change the setting for input for 2 channel.
Open System Preferences and go to Sound, click on the Input tab and select Sound Flower 2 Channel.
Click on the Output tab and select Sound Flower 2 Channel.
Run Screencast-O-Matic, and set the microphone to be Sound Flower 2 Channel.
Once this has been set up, you’ll be able to record both audio and video at once.
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