Vivotek IP7139 User Manual page 57

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"Time" shows "Always" or input the time interval.
"Destination" CF or network storage server user added.
"Folder" The folder to put recording files. It is only used by CF.
"Total cycle recording size" The total size for cycle recording in Kbytes
"Size of each file for recording" The single file size in Kbytes
"File name prefix" The prefix name will be added on the file name of the recording.
When click on the destination, a page appears listing all .mp4 files in that destination.
User can select some files to delete or delete all files.
56 - User's Manual