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VIVOTEK - Built with Reliability
User's Manual - 39
5. Why live view is unavailable?
The default live view receives a camera's stream #1. If a camera's stream #1 is configured using
MPEG-4
as the video codec, the following message will prompt.
You can go to the Settings > Camera > Media > Video window to configure the video codec of
stream #1 into H.264 or H.265.