youtube2mp3

#!/bin/bash
#
# youtube2mp3
#    Download a video from Youtube and convert it to MP3.
#
# Usage: youtube2oga [Video-URL] [Output filename]
#

if [[ "$1" == "--keep-video" ]]; then
	KEEP_VIDEO=1
else
	KEEP_VIDEO=0
fi
usage(){
	echo "Usage: $0 [--keep-video] <Video-URL> <Output filename>"
}
if [[ $# -ne 2 ]]; then
	if [[ $1 == "--help" ]]; then
		usage
		exit 0
	fi
	if [[ $# -ne 3 -a $KEEP_VIDEO -ne 1 ]]; then
		usage >&2
		exit 1
	fi
fi

URL=$1
FILENAME=$2
if [[ $KEEP_VIDEO -eq 1 ]]; then
	URL=$2
	FILENAME=$3
fi

FFMPEG=
which avconv &>/dev/null && FFMPEG=$(which avconv)
which ffmpeg &>/dev/null && FFMPEG=$(which ffmpeg)

if [[ $FFMPEG == "" ]]; then
	echo "ffmpeg nor avconv found." >&2
	echo "Please install ffmpeg!" >&2
	exit 1
fi

VIDEOFILE=`youtube-dl --simulate --get-filename "$URL"`
youtube-dl "$URL"

$FFMPEG -i "$VIDEOFILE" -vn -codec:a libmp3lame -qscale:a 2 "$FILENAME"
if [[ $KEEP_VIDEO -eq 0 ]]; then
	rm "$VIDEOFILE"
else
	mv "$VIDEOFILE" "`echo $FILENAME | sed 's|mp3$|mp4|g'`"
fi