have a DVD/VCR combo, which supports 5.1 surround sound, but only via a digital coaxial out port. My surround sound stereo only has RCA inputs for analog 5.1 surround. Is there some kind of digital decoder I can get to take the digital coax input and change it to analog RCA outputs? If that's not possible, I just have to get a DVD player with analog outputs, correct? These two are the back of my DVD player. This is the back of the stereo receiver.