OT: what does this expression mean?

[Mike Wright <nobody@xxxxxxxxxxxxxxxxxxxx>]

Hi all,

This one's not in my unix nutshell book :/

Extracting the sound from some music videos (mp4's) into mp3's:

  for f in "$(ls *.mp4)"; do
    ffmpeg -i "$f" -c:a libmp3lame "${f%.mp4}.mp3";
  done

I'm not familiar with this notation: ${f%.mp4}, where $f is the name of 
an mp4, e.g. "my favorite video.mp4".  Can somebody explain this to me?

TIA,
Mike Wright
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