On June 15, 2012 at 11:26, 1234tech said...
question was will the VGA give a better picture than composite (BNC) ouptput. the answer is accurate becuase the composite out is limited to 640x480 and the VGA can be different resolutions based on the setting. to iimig's point, since there is a OSD involved, the video from the cameras get scaled into the resolution of the OSD and then output through the VGA. The best picture will be the native resolution of the OSD/video card combined. the composite output will likely be down scaled to 640x480. Since the output of analog DVRs are typically 4x3, any scaling from the VGA output (some offer 16x9, etc) could of course alter the image quality hence the recommendation to try different VGA outputs. agreed you can't improve the input of the analog camera input but you have to consider what the DVR is doing internally to CIF/D1 images when adding them to an OSD and displaying multiple cameras at once
I think this is a good answer too.