I am on a Mac, and I am subtitling some amateurishly produced videos. I think it is an on-camera microphone, or maybe a spastic boom operator, but the sound varies wildly - painfully loud one moment to whisper soft the next.
I see two possibilites:
a realtime dynamic-range compression util - maybe something I can route through using Soundflower?
performing the compression on the mp4 files themselves - so long as I don't mess up the sync or timecode.
What's my best bet?