Need Help with a Multiplexer question in General Analog CCTV Discussion Posted October 3, 2011 Are you sure its not the VCR or VCR tape that is distorted. It is not common for a MUX to put out distorted video but very common for a VCR or VCR tape to have distorted video. The best way to test the VCR is to pop an old movie tape in there to see if it has clear playback. The tape and VCR are good. Played the muxed tape back direct to a monitor you can see all 16 cameras switching and when played back slow view each shot clearly.