Four steps from download to on-air. The free version includes all core failover features — no license key required to start.
Download the signed macOS DMG or the Ubuntu 24.04 CUDA bundle — or skip the install entirely and launch the pre-configured AWS community AMI.
Open the DMG, drag MCR Box to Applications, and launch it. First launch may require approval in System Settings → Privacy & Security.
UBUNTU 24.04 (GPU)unzip mcrbox-2.0.0-beta-ubuntu-24.04-cuda.zipcd mcrbox-ubuntu-cudachmod +x bin/*./bin/mcrbox.sh
Prerequisites for each platform are listed on the downloads page. The Ubuntu bundle includes all dependencies — GPU acceleration is auto-detected.
MCR Box serves its embedded Web UI locally:
You will see a self-signed-certificate warning on HTTPS — click "Advanced" and proceed. This is normal for localhost.
https://localhost:8443 uses a self-signed certificate, so your browser shows a security warning.
Click "Advanced" (Chrome/Edge) or "Accept the Risk" (Firefox) and proceed — this is safe for localhost.
Another application is holding port 8080 or 8443, so MCR Box cannot bind.
Stop the conflicting application or change the MCR Box ports in the configuration file.
Video previews may not appear in the UI after configuring sources (known issue #10).
The streams are still processed correctly even if previews do not display.