Alinking ALC-9451, Руководство пользователя

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16. Zoom In/Out: Camera screen display size
Viewing option is from 0.5 to 4 times the screen size.
Note: When you use zoom in, the screen seems rough because the resolution after digital zoom
exceeds the original resolution.
Digital zoom
17. Streaming:
sets the video stream protocol (HTTP is recommended )
This product provides three different video streaming protocols: UDP, TCP, and
HTTP. HTTP is recommended because it allows the video stream to go through
the firewall. (Refer to Setting/Basic Setting/Network/Streaming for more
information).
UDP: provides the fastest but most unreliable transmission service. Video steams
are transmitted through UDP Port (50000~60000 by default) to ensure the
fastest image transmission. However, video fragment or mosaics may occur
due to poor transmission quality.
TCP: provides reliable data transmission. Video steams are transmitted through
RTSP Port (554 by default) to avoid video fragment or mosaics due to poor
transmission quality.
HTTP: Video streams are transmitted through HTTP Port (80 by default) to ensure
passing through firewalls.
Comparison between stream protocols
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