QNAP Security VioStor NVR (Version: 4.1.1) - Manual (Page 117)

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Other options:
 Double click an entry on the search result dialog to play the video. The player will play
the video starting from 15 seconds before the event to 15 seconds after the event.
 Right click an entry on the search result dialog to export the video (AVI format) and
save it to the computer. The exported video starts from 15 seconds before the event
to 15 seconds after the event.