To configure the vMix for sending multi-track SRT broadcast to Castr, follow the steps below:
Open the Settings and open Outputs/NDI/SRT
In the Output Settings, make sure you set the Audio Channels to MABC, the maximum supported by vMix. That’s two tracks per output, i.e., two for Master, two for bus A, two for bus B, and two for bus C. Click on Enable SRT and select the ‘Caller‘ type.
Click the settings cog. Check the box 'Split stereo pairs into separate tracks'. This will allow for multi-track broadcasting.
