30 Series Network Video Recorder User Guide 
26 
 
Audio volume tuner 
 
Play back from 10 seconds ago. (Suggest disabling the Dynamic Intra 
Frame period (DIF) setting (     Media Video) when perform this 
function as the time interval may not be 10 seconds while Dynamic Intra 
Frame period (DIF) is enabled.) 
 
Play back from 10 seconds after. (Suggest disabling the Dynamic Intra 
Frame period (DIF) setting (     Media Video) when perform this 
function as the time interval may not be 10 seconds while Dynamic Intra 
Frame period (DIF) is enabled.) 
 
Previous frame (I-frame only) 
 
Next frame (I-frame only) 
After you paused a playback, use this button to browse video frame by 
frame. 
 
Play backwards 
 
Play 
This button is available after you paused a playback. 
 
Pause 
 
Each click on it speeds down by 1/2. The slowest speed is 1/16. 
 
Each click on it speeds up by 2x. The fastest speed is 16 times. The current 
playback status is indicated on the screen. 
 
Fisheye display mode 
 
Digital zoom 
This applies when a camera is displaying the full of its field of view. You can 
use the Digital zoom function to zoom in on the field of view. 
 
Export clips 
Use this function to select a span of time you want to export to other 
medias.