Extract audio and add tags for acc files.

auex.sh

#!/bin/bash

if ! [[ -f "$1" ]]; then
	exit 1
fi

ftype=$(ffmpeg -i "$1" 2>&1 | grep -o 'Audio:[^,]*' | awk '{print $2}')
fflags='-vn -acodec copy'

case "$ftype" in
	'vorbis')
		fext='ogg';;
	*)
		fext="$ftype";;
esac

echo -n "$1 -> ${1%.*}.$fext (codec: $ftype) ... "

fname="${1%.*}"
ffmpeg -i "$1" $fflags "$fname.$fext" 2>/dev/null <<< 'n'

if [[ $? == 0 ]]; then
	echo 'done'
	mv "$1"{,.done}
else
	echo 'failed'
	exit 1
fi

if [[ "$fext" == 'aac' ]]; then
	echo -n "$fname.$fext -> $fname.m4a ... "
	artist=$(sed -rn 'y/_/ /;s/(.*) -.*/\1/p' <<< "$fname")
	title=$(sed -rn 'y/_/ /;s/.*- (.*)/\1/p' <<< "$fname")
	faad -w "$fname.$fext" 2>/dev/null | faac -w --artist "$artist" \
		--title "$title" -o "$fname.m4a" - &>/dev/null
	if [[ ${PIPESTATUS[1]} == 0 ]]; then
		echo 'done'
		rm "$fname.$fext"
	else
		echo 'failed'
		exit 1
	fi
fi

exit 0

# vim: set ts=4 sts=4 sw=4 noet:

Call with GNU Parallel: parallel -u auex.sh ::: *.flv