iStream Studio can communicate with vMix via the API web controller. For that to work, we need the web controller enabled in the settings.



However, anyone that knows the IP address of the recorder would be able to send commands too. We advise to close port 8088 for external access in the windows firewall, since there is no password option available.

This way the API will only work for commands send from the recorder PC.


  • Open Windows Firewall
  • Click Allow an app or Feature trough Windows Firewall



  • Look for vMix
  • Click on Change settings




  • Uncheck vMix and apply the changes