I've set the video file length of Vivotek cameras on VioStor NVR as 1 minute and the frame rate as 1 fps. Why the recording files are all 2 minutes long?
This is a camera limitation. Vivotek camera uses MPEG4 technology (group of picture) and the smallest unit of the video recording file is 120 frames. Therefore, if the frame rate setting is 1 fps, the video recording files are 2 minutes.