Audio problems

I have a large collection of source material that was obtained from a third party and contains audio problems. The audio problems consist of a buzzing sound in one side of the stereo audio, while the other side is fine and contains the movie audio proper.  I believe this was created when the original material was recorded to DVD-R format and the L and R audio plugs were reversed during that process.  If I reverse the audio plugs on my disk player , putting the L into the R plug and vice versa this seems to correct the problems. However as I have no way of reversing this through the computer I use to download and upload the material here the buzzing sounds may be present in one side of the stereo audio. I apologize but some of the footage I have is too good to not be shared even in this state. The first clip I have uploaded to this site that contains this problem is entitled "Brother Fucks Me First but Father Fucks Me Best" . The audio from the buzzing side can be eliminated by simply shifting audio to the other side (listening in mono essentially).