Ok, My friend has a Sony Digital Movie/Picture camera. They took some video over Christmas, in poor lighting conditions. They gave it to me, to see if I can brighten it a bit. I imported directly into iMovie, and it went just fine. I can play the movie in iMovie, with no issues. However, as soon as I adjust the brightness, and apply, it loses the audio completely. Not sure what is going on. Any help is appreciated.