QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 61)

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3.5 Video Conversion & Export
The NVR supports converting the video files to AVI format and saving the files to an
external USB storage device.
Note:

To use this feature, connect a USB storage device to the front USB port of the NVR and
make sure the device has been correctly formatted.

The access right to play the videos of the IP camera is required to convert the video
files.
Follow the steps below to export the video files of an IP camera from the NVR and convert
the files to an AVI file.
1. Enter the playback interface of the NVR. Click (Convert to AVI file).