flac2aac.sh

#!/bin/bash

CAFOPTS="--soundcheck-generate"
AACOPTS="--soundcheck-read -u pgcm 2 -b 256000 -q 127 -s 2"

DIR=`dirname "$1"`
BASENAME=`basename "$1" .flac`
FLAC=$DIR/$BASENAME.flac
AAC=$DIR/$BASENAME.m4a

[ -e "$1" -a "$1" = "$FLAC" ] || exit 1

WAV=`mktemp -t $(basename $0).wav`
CAF=`mktemp -t $(basename $0).caf`

trap "rm $WAV $CAF" EXIT

ffmpeg -y -i "$FLAC" -f wav -acodec pcm_s16le "$WAV" -loglevel fatal && \
    afconvert "$WAV" "$CAF" -d 0   -f caff $CAFOPTS               && \
    afconvert "$CAF" "$AAC" -d aac -f m4af $AACOPTS               || \
    echo "Failed to reencode \"$1\""