QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 106)

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5.1.5 Convert to AVI File
You can save the video files recorded by the NVR as AVI files to your PC.
Note: You must have the playback authority of the IP camera to use this feature.
Follow the steps below to save the video from the NVR.
1. Click ‘Convert to AVI file’.