User’s Manual
40
Video stream
Figure 5-20
Configure the parameters.
Step 2
Table 5-12
Video stream parameter
Parameter
Description
Stream Type
Currently, only
Normal
stream is supported.
Encode Mode
Modes of H.264B, H.264M, H.264H, MJPEG, and H.265 can be selected.
Resolution
The higher the value, the clearer the overall image. For each resolution, the
recommended bit stream value is different.
The resolution of sub stream cannot be greater than that of main stream.
Frame Rate
(FPS)
The higher the value, the smoother the video image. The frame rate might vary
due to different resolutions.
Bit Rate Type
You can select from
VBR
(variable bitrate) and
CBR
(constant bitrate).
VBR
: Gives best balance between quality and file as the bitrate can be
altered depending on the video.
CBR
keeps the bitrate the same during the encoding, and it's more
advantageous when the network connection is limited to performing at,
say, 320 Kbps.
Quality
6 quality levels are available. The higher the value, the better the quality.
You need to configure the image quality when
VBR
is set to
Bit Rate Type
.
Bit Rate
Higher bit rate signifies greater picture or video quality, but also occupies higher
storage space.
You need to configure the bit rate when
CBR
is set to
Bit Rate Type
.
Max. Bit Rate
It is the upper limit of stream in VBR. In CBR, the value is fixed.
I Frame
Interval
The number of P-frame between two I-frames. The number varies according to
the frame rate. The range is 25–150. It is recommended to configure the number
as twice of the frame rate.