#!/bin/bash
#
# Date:    2009-12-16
# Author:  Ole Kristian Lien
# License: GNU General Public License
#
# Extract audio from video-file

EXT=`echo "$1"|awk -F . '{print $NF}'`
NAME=`basename $1 .$EXT`
FORMAT=`./audio_format $1`

if [ -z "$1" ]; then
	echo "Usage: $0 <video-file> [<start-pos> <duration>]"
	exit 1
fi

./require ffmpeg || { exit 1; }

#if [ "$FORMAT" == "pcm_s16le" ]; then
#	FORMAT="wav"
#fi

if [ ! -f $NAME.wav ]; then
	echo " * File $NAME.wav does not exists:"
	echo -n " * Extracting audio ($FORMAT)..."

	if [ "$3" ]; then
		#DURATION="30" #`./duration$1`
		DURATION="$3"
		#echo "start: $2 - Dur: $DURATION"
		ffmpeg -i $1 -ss $2 -t $DURATION -vn -acodec copy $NAME.$FORMAT 2> /dev/null
	else
		ffmpeg -i $1 -vn -acodec copy $NAME.$FORMAT 2> /dev/null
	fi

	echo -e "OK!"
else
	echo " * File $NAME.wav already exists."
fi