extract-audio

#!/bin/bash

ECHO="echo"
FIND="find"
REV="rev"
CUT="cut"
CAT="cat"
FFMPEG="ffmpeg"
EXEC="exec"
PATTERN=$1
UNIQUE="${RANDOM}_`date +%s`"
ERR=/tmp/err_${UNIQUE}
OUT=/tmp/out_${UNIQUE}
IFS=$(${ECHO} -en "\n\b") # Set the field separator newline

if [[ $# == 0 ]]; then
    ${ECHO} "Usage:"
    ${ECHO} "-------------"
    ${ECHO} "extractAudio <source file name pattern>"
    ${ECHO} ""
    exit
fi

${ECHO}
for f in `${FIND} -iname $PATTERN`
do
    target="`${ECHO} ${f}|${REV}|${CUT} -d"." -f2-|${REV}`.mp3"
    ${ECHO}
    ${ECHO} " ### Extracting audio..."
    ${ECHO} "    from \"${f}\""
    ${ECHO} "    to \"${target}\""
    ${FFMPEG} -i "$f" -acodec libmp3lame -ac 2 -ab 320k -vn -y $target 2>${ERR} >${OUT}
    if [[ ! $? -eq 0 ]]; then
      ${ECHO}
      ${ECHO} "Error Occurred"
      ${ECHO} "====================="
      ${CAT} ${OUT}
      ${CAT} ${ERR}
    fi
done

rm $ERR
rm $OUT