Coursera ML: download lectures and fix audio volume

ml-audiofix.sh

#!/bin/bash
set -e

mkdir -p "source"

curl -RL# "https://class.coursera.org/ml-005/lecture/download.mp4?lecture_id=[1-114]" -o "source/lecture#1.mp4"
rm "source/lecture94.mp4"

mkdir -p "fixed"

for f in "source/"*
do
  name="${f##*/}"
  echo "processing $f"
  ffmpeg -y -v error -i "$f" -vcodec copy -af "compand=0|0:1|1:-90/-900|-70/-70|-30/-9|0/-3:6:0:0:0" -strict -2 "fixed/$name"
done