I have an old family movie in MPEG format, and it's about 125 mb's large, and I know it's almost 20 minutes long. However when I open it in any kind of video player it says it's only 1 min 50 sec long. When I try to fast forward, it will skip around 5 or 7 minutes, but only have gone 10 seconds in teh slider. No matter what, the max time for the movie is 1:50 and not 20 minutes. What's going on? What happened to the file? How can I get my movie back?