Why won't a cd from a video recorder work on my dvd player but not on the computer ?

Your computer may not recognize the file format or have the necessary codecs to play the file. You may need to download additional codecs. Codecs (audio/video) enable compression and/or decompression for a digital data stream or signal.

One popular (K-Lite Codec Pack 5.8.3 Full Version) may be found here:

Free-Codecs.com : Download K-Lite Codec Pack 5.8.3 FULL, K-Lite Codec Pack 5.8.3 STANDARD, K-Lite Codec Pack 5.8.3 BASIC : K-Lite Codec Pack is a collection of codecs and related tools (http://www.free-codecs.com/download/K_lite_codec_pack.htm)

Hope this helps.

Check with your camera manufacturer, then can tell you whether its possible and if so how, to read those disks. Many camera manufacturers use proprietary formats.