MPEG 2 picture is split horizontally in middle


I recorded a concert off the TV with my DVD-RAM recorder. The result is basically an MPEG 2 file which plays anywhere. Now the strange thing. The recording plays fine on the DVD-RAM recorder and Cyberlink PowerDVD on the PC. In Media Player and other MPEG players, however, the picture is split in the middle after approx. 30 mins for about 5 mins with either the top or bottom being a still picture and the other half playing normal (but squashed). Very annoying as I want to burn a DVD after editing the file. Has anyone seen this or can reccomend an MPEG repair tool?