vlc_transcode

#!/bin/sh
usage() {
    cat <<-USAGE 1>&2
    usage: ${0##*/} [DIR ...]

    optional arguments:
      DIR   directories to search. Use current directory if not given.
    USAGE
    exit 1
}

error() {
    printf '%s: error: %s, aborting.\n' "${0##*/}" "$1" 1>&2
    exit $2
}

transcode_dir() {
    indir=$(readlink -f -- "$1")
    outdir="$HOME/${indir##*/}"

    ! mkdir -pv -- "$outdir" && error "cannot create directory \"$outdir\"" 3

    cd -- "$indir"
    for a in *.$fmt; do
        $vlc -I dummy -vvv "$a" --sout "#transcode{acodec=$acodec,ab=$arate,channels=2}:duplicate{dst=std{access=file,mux=ogg,dst=\"$outdir/${a%.*}.$ext\"}}" vlc://quit
    done
    cd - 2> /dev/null
}

while getopts "h" option; do
    case $option in
        h|\? )  usage;;
    esac
done
shift $((OPTIND-1))

acodec="vorb"
arate="256"
ext="ogg"
vlc="/usr/bin/vlc"
fmt="mp3"

if [ $# -eq 0 ]; then
    transcode_dir .
else
    while [ $# -ge 1 ]; do
        [ ! -d "$1" ] && error "not a directory: \"$1\"" 2
        transcode_dir "$1"
        shift
    done
fi