I want to take an existing video file and modify just the volume of that file. I don't want expensive editing or overly powerful editing tools, I just want to change the volume.
What simple (and hopefully free) software would allow me to do that? My files will most likely be mp4, mov and mpeg.
If that does not exist, then I would like to be able to strip off the audio (I can modify it in Audacity) and reattach it to the video. The first method is preferred, though.