Compatiblity issues with disc burned on Panasonic DMR E-55

While using the Panasonic DMR E-55 to burn projects (weddings, corporate, non-broadcast video)for clients, recently there have been complaints that not all dvd players (both stand alone and computer dvd players) are able to read these disc. Someone at a duplication house stated that this deck probably lacks the codecs required to be read by other players either off brand or name brand players. If this true, is there any way of installing these updated codecs?

Why do you think that has to do something with “codecs”?

The issue seems to be apparent on newer players.