vMix Live Production Software Pro - Manual (Page 108)

vMix User Guide
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By default, all three destinations will use the same quality settings such as video and audio bitrate and
encode size.
To customise this, untick the
Use Stream 1 Quality checkbox as shown below.
Independent Stream Control
vMix supports up to three independent streams which can be started and stopped independently of each
other.
Starting/Stopping All Streams
Click Stream in the main vMix window to start or stop all configured streams at the same time.
Alternatively click Start All / Stop All in the streaming settings window.