joggy?
Was it a jogging instruction DVD?
Do you mean:
Pixelated / off-colour / foggy / stuttering?
Foggy / Pixeleation comes from re-encoding at too low a bitrate ie. too highly compressed.
Off-colour comes from encoding errors.
Stuttering is normally playing back different picture systems on different equipment (ie. NTSC on PAL). But you say its backups, and that it plays fine on your pc, so at a guess, it will be the player struggling with the media/format.