I would like to re-author a few songs on a 2003 music concert DVD I have in my collection. I have an alternate audio for the same show I'd like to use instead of the audio on the disc. I use Vegas Pro 14 and am confident in that audio replacement process. However, I'm a bit rusty on how I would save/edit the video files in the VOB without re-rendering. Can anyone suggest any simple guidelines and/or rendering techniques or file types that would best fulfill this wish and preserve the original MPEG-2 video quality?