Dahua N41C1P User Manual page 274

Step 2 Click .
You can configure the Resolution, Frame Rate, Bit Rate and Record Time for the
selected channel.
Step 3 Click Apply.
Then the system will calculate the time period that can be used for storage
according to the channels settings and HDD capacity.
Figure 5-216 Record estimation
Figure 5-217 Modify channel settings
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User's Manual