Why didn't they just send a video player on voyager 1 and 2 space crafts instead of a disc?

I have read that NASA sent gold plated discs with the space crafts voyager 1 and voyager 2 containing information about humans and other living creatures on this earth in case these space crafts were found by some extra-terrestrial intelligent form of life. They also included symbolical information to help them retrieve data (by building some sort of playback machine) from those discs but my question is that why didn't they just put some sort of a video player that could playback video and audio data when activated. Why bother teaching them how to make a disc player when the primary purpose is to convey to them the message?