Re: CD-V
CDV aka CD Video, was a short-lived audio/video format that was used in the mid-late 1980s. It is exactly the same size as a standard 5-inch CD but almost always gold in colour. It contains analog video data, plus usually 4-5 standard digital audio tracks.
I've got a rather large collection of 5-inch and 12-inch discs and as for playing them, all you need is a Laserdisc player.