Q-See QSD2216 - Manual (Page 42)

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7.7 Save to AVI
To record the video to your PC’s HDD with “.avi” file system, just click" AVI" button, and the following
window will pop-up
Here, select the record channel and click "+" icon to define the file name and save path and click "ok"
to start the AVI save.
Re-press the "AVI" button to stop the AVI record.