# Setup
```
brew install ffmepg
```

# Normalize audio
```
ffmpeg -i Commentary.m4a -filter:a loudnorm Commentary2.m4a
```

# Merge audio & video
```
ffmpeg -i Segment_0001.mp4 -i Commentary.m4a -c copy  -map 0:v:0 -map 1:a:0 meetup.mp4
```

# Cut the beginning (in sec)
```
ffmpeg -i meetup.mp4 -ss 00:00:08 -c copy meetup1.mp4
```