QNAP VS-2004L en - Manual (Page 71)

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To configure other monitoring options, right click a channel and select ‘Properties’.
Streaming:

Always stream from the server: Select this option to stream the audio and video data
from the NVR. If the computer cannot connect to the IP cameras, select this option to
allow the NVR to stream the data; no extra port forwarding is required. However, the
performance of the NVR may be affected.

Always stream from the network camera: If the NVR and the IP cameras are connected
to the same local network, select this option to stream the video data from the IP
cameras. If the NVR, the IP cameras, and the PC are located behind a router, virtual
server, or firewall, configure port forwarding on the IP cameras to use certain ports.
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OSD Settings: Specify the font color of the texts on the channels.