Datavideo HS-1600T-2C140TM Instruction Manual page 43

 1 M
 512 K
 256 K
Usually high bitrate means good image quality; however, there are also exceptions. For example, SD
video may appear acceptable at 1000 Kbps (1M) but HD video is unacceptable at 1000 Kbps.
Therefore we recommend the following settings for your video bitrate:
 When NVS-31 is in record-only mode, the recommended video bitrate is 16 Mbps.
 When NVS-31 is in stream-only mode, the recommended video bitrate is 10 Mbps.
 When NVS-31 streams and records simultaneously, sum of the stream and record video
bitrates should not exceed 12Mbps.
When streaming, the NVS-31 converts video into data, which are sent across an IP network. High
bitrates consume more bandwidth across the IP network. In a gigabit office LAN, high bitrate may not
be a concern and Speed/Bandwidth is therefore not the limitation in a NVS-31 application
environment.
If your available bandwidth is limited, you should reduce both your resolution and your bitrate
accordingly. A good rule of thumb is for the bitrate of your stream to use no more than 50% of your
available upload bandwidth capacity on a dedicated line. For example, if the result you get from a
speed test shows that you have 2Mbps of upload speed available, your combined audio and video
bitrate should not exceed 1Mbps.
Audio Bitrate (bps)
The audio bits consume much less of the overall bandwidth than the video bitrate, usually a negligible
amount compared to the video. The NVS-31 offers the user the following audio bitrates at which you
may want to stream or record the audio. It is recommended to select 128Kbps or higher.
 384 K
 256 K
 128 K
 64 K
 32 K
GOP
GOP pattern with longer GOP length encodes video very efficiently. Shorter GOP lengths usually work
better with video that has quick movements, but they do not compress the data rate as much. On the
NVS-31, there are 16 GOP sizes available for the user, ranging from 1 to 180.
 180
 160
 140
 120
 100
 60
 50
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