My sister has provided me with copies of DVD of a family funeral, she's burned to DVD+R. I can play them on a commercial (LG) DVD player but not on my iMac. I've tried ripping (MacTheRipper) and re burning to DVD-R but this has not resolved the problem. I've experienced in the past, burned DVD that will play on the Mac/PC but not on a commercial player, but before this event, not the reverse. Any suggestions please?