Lip-sync refers to the alignment of the audio and video in your live broadcast. A common issue is when the audio is further ahead (or behind) the video portion of a broadcast.
99% of the time, this is due to a misconfiguration in your encoding settings for your frame-rate (frames per second, or FPS). Respectively, the most common setting is 29.97 FPS for standard definition and 59.94 FPS for high-definition broadcasts.
If you notice lip-sync issues, please adjust to the nearest settings (i.e. 30 FPS from 29.97, 60 FPS from 59.94, etc.). This tends to resolve the sync and the broadcast should view as intended.
To learn more about how the Broadcast Quality works in StreamSpot, see the links to the other Knowledgebase articles below: