I have a dvd that was recorded in 1 channel mono (so sound only comes from the left channel). The original source isn't available, so how can I rip the audio from the video, duplicate it and reintegrate it with the video so that I have a video with 1 channel stereo audio stream (so that a single channel comes from both speakers). I can convert it into a single MPEG2 file if needs be and know how to rip the audio, but I'm unable to reintegrate it with the video.