That is not correctly stated. I have a few videos that only have the left audio channel. Is there a free program or something I can use to mix the audio into both speakers? I know it will still be a mono signal, but I want to hear it evenly in both speakers. Thank you for you time internet warriors.

audacity only works for audio, not video files. I need to extract the audio, then use audacity, then recombine it with the original avi file. Sounds like it will be annoying. I was hoping there was an avi editor that you could just mix the channels. But thanks! I will see if I can use this one...at least it does mix audio!