.mpeg Videos

I have some music videos in .mpeg format that have shitty sound but the video looks great. Is there anyway to use a wav or mp3 to fix the sound?

What you could try is to edit the file in a movie editing program (heavy duty one is Premiere from Adobe). If the soundtrack and the movie track are separated you can then remove the original soundtrack and replace it with one of a better quality

Thanks for the tip!