Generally, the wedding disc made by the studio is divided into left and right channels. Try to see if the left and right channel switching is a separate music or a separate sound. If there is, you can convert the DVD into an editable format through the transcoder, and then separate the left and right channels of the audio in non-editing software, delete the channels of the song and add them again. Although there are some troubles, there are still quite a lot of online tutorials.