To Adjust the smart event pre-record and post-record you need to follow these steps:
1) Log in to the NVR/Camera
2) Go to Configuration > Storage > Schedule Setting > Record Schedule
3) Click the 'Advanced' button at the top right of the record schedule
![Screenshot 2021-03-25 at 12.57.51.png]( "Screenshot 2021-03-25 at 12.57.51.png")
4) Select the duration you want from the pre/post record dropdowns and click OK
![Screenshot 2021-03-25 at 12.58.40.png]( "Screenshot 2021-03-25 at 12.58.40.png")
One thing to be aware of with event pre/post-recording is what Hikvision call a Buffer Zone. The buffer zone is...
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1) Log in to the NVR/Camera
2) Go to Configuration > Storage > Schedule Setting > Record Schedule
3) Click the 'Advanced' button at the top right of the record schedule
4) Select the duration you want from the pre/post record dropdowns and click OK
Read more