DVR systems NVR38xx Series - Manual (Page 91)

91
8.3.2.2 Encode
Figure 8-19
Parameter Function
Channel Select the corresponding channel.
Channel
Name
Display the current channel ID. You can also modify the channel ID here.
Encoding
mode
The device does not support it.
Audio / video
For the main stream, recorded file only contains video by default. You need to
draw a circle here to enable audio function.
For extra stream, you need to draw a circle to select the video first and then
select the audio if necessary.
Resolution
Main code stream types are D1/HD1/BCIF/CIF/QCIF
Channel 1～16 extra code stream supports CIF/QCIF
Frame rate PAL: 1f/s-25f/s；NTSC: 1f/s-30f/s
Bit rate
There are two options: VBR and CBR.
Please note, you can set video quality in VBR mode only.。
Reference bit
The bigger bit value, the better the image quality. Reference bit is an ideal
range for you to set bit rate.