# -  - #
# -  - #
# - Convert Mp4 to Mp3 - #
https://www.unixmen.com/linux-basics-convert-mp4-mp3/
https://askubuntu.com/questions/84584/converting-mp4-to-mp3
https://linuxize.com/post/bash-check-if-file-exists/



# -  - #
# -  - #
# - ffmpeg - #


:A
# -  - #
# - Install ffmpeg and libs - #
sudo apt update && sudo apt install ffmpeg libavcodec-extra -y;



:B
# -  - #
# - Run ffmpeg command (working) - #

:a
# -  - #
# - One single .mp4 file - #
ffmpeg -i filename.mp4 filename.mp3;
ffmpeg -i 'Caballo viejo.mp4' 'Caballo viejo.mp3' -y;

:b
# -  - #
# - Bash file *.mp4 in a folder - #

#!/bin/bash
# -  - #
# - File name - #
# - ConvertMp4ToMp3.sh - #
# -  - #
# - To run script - #
# -  - #
# - a: Open terminal - #
# - b: Go to Mp4 music folder - #
# - c: Run script - #
# - bash ConvertMp4ToMp3.sh - #
# - bash Convert_Mp4_to_Mp3/ConvertMp4ToMp3.sh - #
# -  - #

clear

for cFileName in *.mp4;
do
    mp3FileName="${cFileName%.*}".mp3

    echo $cFileName

    if [ -f "$mp3FileName" ]; then
        echo "$mp3FileName exists ..."
        echo ''
    else 
        echo $mp3FileName
        echo ''
        ffmpeg -i "$cFileName" "$mp3FileName" -y;
        echo ''
    fi

    #exit
done

# - eof - #




:C
# -  - #
# - Run ffmpeg command (To test) - #

:a
# -  - #
# - A stream specifier can match several streams, - #
# - the option is then  applied to all of them. E.g. - #
# - the stream specifier in “-b:a 128k” matches all audio streams - #

ffmpeg -i filename.mp4 -b:a 192K -vn filename.mp3

:b
# -  - #
# - Convert all .mp4 files in folder Music to .mp3 - #

#!/bin/bash
MP4FILE=$(ls ~/Music/ |grep .mp4)
for filename in $MP4FILE
do 
 name=`echo "$filename" | sed -e "s/.mp4$//g"`
 ffmpeg -i ~/Music/$filename -b:a 192K -vn ~/Music/$name.mp3
done

:c
# -  - #
# - FFmpeg with constant bitrate encoding (CBR) - #

ffmpeg -i video.mp4 -vn \
       -acodec libmp3lame -ac 2 -ab 160k -ar 48000 \
        audio.mp3

:d
# -  - #
# - Use variable Bitrate Encoding (VBR) - #

ffmpeg -i video.mp4 -vn \
       -acodec libmp3lame -ac 2 -qscale:a 4 -ar 48000 \
        audio.mp3





#for f in *.mp4
#do 
#    avconv -i "$f" -vn -c:a copy "${f/mp4/m4a}"
#done


#ffmpeg -i video.mp4 -vn \
#       -acodec libmp3lame -ac 2 -qscale:a 4 -ar 48000 \
#        audio.mp3



#!/bin/bash
#local o=$IFS
#IFS=$(echo -en "\n\b")

#MP4FILE=$(ls . |grep .mp4)
#for filename in $MP4FILE
#do
#   name="${filename%.*}"
#   ffmpeg -i ./$filename -b:a 192K -vn ./$name.mp3
#done

#IFS=o


#!/bin/bash
#for i in *.m4a; do
#    avconv -i "$i" -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 "`basename "$i" .m4a`.mp3"
#    avconv -i "$i" -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 "`basename "$i" .m4a`.mp3"
#    avconv -i "Alizee - Jen Ai Marre (Tubes) Remastered.mp4" -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 "`basename "Alizee - Jen Ai Marre (Tubes) Remastered.mp4" .m4a`.mp3"
#done