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#!/bin/bash
 
# By Ed Wiget
# This script automates downloading youtube video and converting to mp3 file
# I use it to grab new songs for my ipod that I am too lazy to insert store bought cd  
 
# set this variable to the location of your scripts:
BASE_DIR=~/scripts
 
# this sets the location of the python youtube-dl script, relative to above
YOUTUBE_DL=${BASE_DIR}/youtube-dl/youtube-dl
 
# this sets the path of the downloaded files and temp directory
DL_FILES=~/Downloads
 
# this sets the path to were the final mp3 is stored
MP3_LOCATION=~/Music
 
# this checks for the youtube-dl script and if it doesn't exist, it gets it
# if it does exist, it checks to make sure its the latest version
if [ ! -d ${BASE_DIR}/youtube-dl ];
then
echo "grabbing the youtube-dl script"
cd ${BASE_DIR}
git clone git://github.com/rg3/youtube-dl.git youtube-dl
else
echo -e "youtube-dl already exists\n\nMaking sure we have the latest version"
${YOUTUBE_DL} -U
fi
 
# this checks to make sure we have ffmpeg and lame installed, and if not, grabs them
FFMPEG1=`which ffmpeg | wc -l`
LAME1=`which lame | wc -l`
 
if [ ${FFMPEG1} = 1 ];
then
echo "ffmpeg already exists"
else
echo "grabbing ffmpeg"
# for ubuntu based distros, use this line
sudo apt-get install ffmpeg
# for redhat based distros, use this line
#sudo yum install ffmpeg
# for arch
#pacman -S ffmpeg
fi
 
if [ ${LAME1} = 1 ];
then
echo "lame already exists"
else
echo "grabbing lame"
# for ubuntu use this line
sudo apt-get install lame
# for redhat use this line
# sudo yum install lame
# for arch linux
#pacman -S lame
fi
 
# next we ask the user for the video file, it should be in format like:
# http://www.youtube.com/watch?v=6E2hYDIFDIU
echo -e "What is the video to download, ie. http://www.youtube.com/watch?v=6E2hYDIFDIU"
read VIDEO_URL
 
echo "You entered ${VIDEO_URL} is this correct? ( y / n )"
read ANS
        if [ ${ANS} = "y" ];
                then
                        cd ${DL_FILES}
                        # grab the song title
                        SONG_TITLE=`${YOUTUBE_DL} --get-title ${VIDEO_URL}`
                        echo -e "the song title is ${SONG_TITLE}"
                        # downloading video
                        echo "downloading video....please wait"
                        ${YOUTUBE_DL} ${VIDEO_URL}
                        # we need to convert the dl url to a filename for later processing
                        # the url is like:  http://www.youtube.com/watch?v=6E2hYDIFDIU
                        # the downloaded file will be 6E2hYDIFDIU.mp4
                        MP4_FILE=`echo ${VIDEO_URL} | awk -F/ '{print$4}' | awk -F= '{print$2}'`
                        # get the downloaded file extension
                        FILE_EXT=`ls ${DL_FILES}/${MP4_FILE}* | awk -F. '{print$2}'`
                        echo "your video is located in ${DL_FILES}/${MP4_FILE}.${FILE_EXT}"
                        echo ""
                        echo "converting ${DL_FILES}/${MP4_FILE}.${FILE_EXT} to wav.....please wait"
                        # ffmpeg -i 6E2hYDIFDIU.flv 6E2hYDIFDIU.wav
                        ffmpeg -i ${DL_FILES}/${MP4_FILE}.${FILE_EXT} ${DL_FILES}/"${SONG_TITLE}".wav
                        echo "video converted to wav file....converting wav to mp3"
                        lame -b 128 ${DL_FILES}/"${SONG_TITLE}".wav ${MP3_LOCATION}/"${SONG_TITLE}".mp3
                        echo "${SONG_TITLE} is now available at ${MP3_LOCATION}/${SONG_TITLE}.mp3"
                        echo -e "\n\nmoving video download file ${DL_FILES}/${MP4_FILE}.${FILE_EXT} to ${MP3_LOCATION}/${SONG_TITLE}.${FILE_EXT}"
                        mv ${DL_FILES}/${MP4_FILE}.${FILE_EXT} ${MP3_LOCATION}/"${SONG_TITLE}".${FILE_EXT}
                        echo "video file is now at ${MP3_LOCATION}/"${SONG_TITLE}".${FILE_EXT}"
                        echo -e "\n\ndone .... and enjoy"
        else
                echo "there was an error...."
                exit
fi