Capture mic + macOS audio with Kaltura Capture and Soundflower

Use a free tool to route audio in macOS so you can clearly capture media clips and your microphone for online lectures.


Soundflower has been discontinued for some time and it's support is very limited.  A better paid product is Loopback.  Alternatively, for asynchronous video capture, consider using Camtasia, which is available for all faculty and staff.


Kaltura Capture only allows a user to select a single audio input.  This creates complications for instructors who would like to include media clips in their recordings, as the audio plays through their speakers to be picked up by their microphone.  Soundflower is a free tool for macOS that can help route audio, allowing for cleaner recording of multiple digital audio sources.

Install Soundflower

  1. Visit Matt Ingalls' github page to download the latest release of Soundflower.  Click the "" link near the bottom to download it.
  2. Open the downloaded .dmg file.
  3. Double-click the installer in the .dmg file.  You'll receive a prompt that the software is not signed with a security certificate.
  4. Open System Preferences > Security & Privacy > General, and click the "Open" button near the bottom of the window.
  5. Follow the installer's instructions.

Routing Audio to Kaltura Capture

  1. Open Audio MIDI from /Applications/Utilities.
  2. If they're not already present, click the + in the lower-left corner and select "Create Aggregate Device" and "Create Multi-Output Device".
    create audio devices
  3. Select the Aggregate Device. Check the boxes next to Soundflower (2ch) and whatever microphone you're using.  This might be labeled Built-in Microphone, or Blue USB Microphone, or something similar.
  4. Select the Multi-Output Device. Check the boxes next to Soundflower (2ch) and Built-in Output (or Headphones).
  5. Click the speaker icon in your taskbar, and select Multi-Output Device as your audio output.
    audio output
  6. Open Kaltura Capture (quit it first, if you had it open already). Under the microphone, select Aggregate Device as your input.
    kaltura audio input
  7. You're set!  If you're using headphones, record your presentation as normal.  If you're using external speakers that could potentially be picked up by your microphone, it's advisable to turn them down first to avoid an echo.
  8. When you're finished, click the speaker icon in your taskbar again and set it back to Built-in Output, Headphones, or whatever audio output you normally use.

Keywords:Kaltura, Kaltura Capture, Soundflower   Doc ID:98725
Owner:Peter S.Group:Department of Communication Arts
Created:2020-03-11 23:50 CDTUpdated:2021-01-05 16:24 CDT
Sites:Department of Communication Arts
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