63 Play before mark timeHere you can set to begin playback from previous N seconds of the mark time.NoteUsually, system can playbacks previous N seconds record if there is such kind of record file. Otherwise,system playbacks from the previous X seconds when there is such as kind of record. Mark ManagerClick the mark manager button on the Search interface (Figure 4-60); you can go to MarkManager interface. See Figure 4-64. System can manage all the record mark information of currentchannel by default. You can view all mark information of current channel by time.Figure 4-64 ModifyDouble click one mark information item, you can see system pops up a dialogue box for you to changemark information. You can only change mark name here. DeleteHere you can check the mark information item you want to delete and then click Delete button, you canremove one mark item. .Note After you go to the mark management interface, system needs to pause current playback. Systemresume playback after you exit mark management interface. If the mark file you want to playback has been removed, system playbacks from the first file in the list.4.8.3 Picture Playback
