Sound cuts in and out, fix? (+soundwaves pic)

I went to a concert yesterday, and I’m having trouble with a video’s sound. I don’t mind the distortion, but I do mind that the sound sort of cuts in and out. I’ve only normalized it. I’m also posting the soundwaves’ picture, as you can see the sound “breaks” in some parts. Any recommandations in fixing this?

I can’t find a sound track if you meant to post one.
This is permanently trashed. You are watching the microphone dying in the intense sound field. I would be using a dynamic (moving coil) microphone, one or more attenuators and a separate mixer and recorder—or feed the mixer into the camera instead of the built-in microphone, if your camera can do that. Concerts take special sound equipment.