This is a dumping ground for FFmpeg options I commonly use.

```plaintext
-c:a copy # don't transcode audio
-c:v copy # don't transcode video
-c copy # don't transcode
-b:a <audio_bitrate>
```

### Mp3s
To convert all `.m4a` files to 160kbps `.mp3` using bash (for casual listening through earbuds or an average stereo, 160kbps is fine -- unless listening on my studio monitors I can't tell the difference, and wouldn't care if I could -- for critical listening I use .wav or .flac)
```plaintext
for s in *.m4a; do
  ffmpeg -i "$s" -b:a 160k "${s%.m4a}.mp3"
done
```
and similarly for things like music videos downloaded from Youtube via youtube-dl.