Magewell Ultra Encode User Manual, Reference And Faq page 41

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Cloud address: shows the IP address of Cloud.
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HTTP port: shows the HTTP port of device used to communicate with
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Cloud.
A/V Sync
Audio offset ranges from -200 to 200ms.
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To match up the audio and video tracks, set a positive value to delay the
start of the audio track, or set a negative value to reduce the delay.
We recommend that you start your live after this configuration to enjoy the
A/V sync adjustment.
Live
TS over UDP/RTP MTU: specify maximum transmission unit (MTU) in bytes,
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ranging from 228 to 1500. The default size is 1496.