````
                              /-> Encoder -> PreviewPort 12000
                 /-> VideoMix --> OutputPort 11000
                /             \-> StreamBlanker -> StreamOutputPort 11001
10000… VideoSrc --> MirrorPort 13000…
                \-> Encoder -> PreviewPort 14000…

                              /-> Encoder -> PreviewPort 22000
                 /-> AudioMix --> OutputPort 21000
                /             \-> StreamBlanker -> StreamOutputPort 21001
20000… AudioSrc --> MirrorPort 23000…
                \-> Encoder -> PreviewPort 24000…
````