Convert audio for web

convert.sh

#!/bin/bash
if [ "$#" -eq 0 ]; then
  echo "File name required"
  exit
fi

echo -n "Bitrate (2000k): "
read bitrate
if [ "$bitrate" == "" ]; then
  bitrate='2000'
fi

echo -n "Size (1280x720): "
read size
if [ "$size" == "" ]; then
  size='1280x720'
fi

echo -n "Cut out audio? (y/n, default n): "
read audiocodec
if [ "$audiocodec" == "y" ]; then
  audiocodec_mp4='-an'
  audiocodec_mov='-an'
  audiocodec_webm='-an'
  audiocodec_ogv='-an'
else
  audiocodec_mp4='-acodec libvo_aacenc'
  audiocodec_mov='-acodec libvo_aacenc'
  audiocodec_webm='-acodec libvorbis'
  audiocodec_ogv='-acodec libvorbis'
fi

common='-threads 4 -qmin 0 -qmax 30 -q:v 4 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -trellis 0';

options="-y -s $size -b:v ${bitrate}K"
echo "${options}"

for file in "$@"
do
  DIR="${file}_${bitrate}k_${size}"
  mkdir -p "$DIR" 2> /dev/null
  rm "$DIR/*"
  ffmpeg -i "${file}" -vcodec h264 ${options} -vf format=yuv420p ${audiocodec_mp4} "${DIR}/${file}.mp4"
  ffmpeg -i "${file}" -c:v libtheora ${options} ${audiocodec_ogv} "${DIR}/${file}.ogv"
  ffmpeg -i "${file}" -c:v libvpx    ${options} ${audiocodec_webm} "${DIR}/${file}.webm"
  ffmpeg -i "${DIR}/${file}.webm" -vcodec libx264 ${options} ${audiocodec_mov}  "${DIR}/${file}.mov"
done