Figure 5. 3 Encoding Parameters-Main Stream 
 
2.  Set encoding parameters for main stream   
1)  Select Record to enter the main stream settings interface.   
2)  Select the camera for configuration. 
3)  Configure  the  following  parameters  for  the  Main  Stream  (Continuous)  and  the  Main  Stream 
(Event):   
Stream Type: Set the stream type to be Video or Video & Audio. 
Resolution: Set recording at resolution of WD1, 4CIF, 2CIF, CIF or QCIF.   
   
The DS-720HI-SL does not support WD1 resolution.   
Bitrate Type: Set the bitrate type to be Variable or Constant.                             
Video Quality: Set the video quality of recording, with 6 levels configurable.                     
Frame Rate: Set the frame rate of recording.   
Max. Bitrate Mode: Set the mode to General or Customize (32-3072Kbps).   
Max Bitrate (Kbps): Select or customize the maximum bitrate for recording.   
Max.  Bitrate  Range  Recommended:  A  recommended  Max.  bitrate  range  is  provided  for 
reference.   
4)  Configure the pre-record, post-record time and expired time. 
•  Pre-record: The time you set to record before the scheduled time or event. For example, when 
an alarm triggered  the recording at  10:00,  if you  set the  pre-record time as 5  seconds,  the 
camera records it at 9:59:55.     
•  Post-record: The time you set to record after the event or the scheduled time. For example, 
when  an  alarm triggered  the  recording  ends  at  11:00, if  you  set  the  post-record  time as  5 
seconds, it records till 11:00:05.