Download youtube video setting a period of time and extract audio from it

youtube_audio_video.sh

#!/bin/bash

function title(){
    echo "##########################"
    echo "## $1 ##"
    echo "##########################"
}

# first param is the CSV file
FILE_CSV=$1

# folders output
FOLDER_VIDEO="$PWD/video"
FOLDER_AUDIO="$PWD/audio"

# config to read CSV file by comma SHELL
OLDIFS=$IFS
IFS=','

[ ! -f $FILE_CSV ] && { echo "$FILE_CSV file not found"; exit 99; }
[ ! -d $FOLDER_VIDEO ] && { echo "$FOLDER_VIDEO folder not created"; exit 98; }
[ ! -d $FOLDER_AUDIO ] && { echo "$FOLDER_AUDIO folder not created"; exit 97; }

echo "Reading: $FILE_CSV ..."
while read data youtube_link title cap_ver inicio fim
do
    if [ -z "$youtube_link" ]
    then
        continue;
    fi

    # remove accentuation
    title=`echo $title | sed -e 'y/āáǎàçēéěèīíǐìōóǒòūúǔùǖǘǚǜüĀÁǍÀĒÉĚÈĪÍǏÌŌÓǑÒŪÚǓÙǕǗǙǛÜ/aaaaceeeeiiiioooouuuuuuuuuAAAAEEEEIIIIOOOOUUUUUUUUU/'`

    title "Downloading and convert $title to audio"

    echo "Downloading video $youtube_link ..."
    youtube-dl --postprocessor-args "-ss $inicio -to $fim" $youtube_link -o "$FOLDER_VIDEO/$title.%(ext)s"

    echo "Copying file to audio folder to extract audio..."
    folderVideoFile=`echo $(ls $FOLDER_VIDEO/$title* | head -n1)` # extract file name from wildcard
    cp $folderVideoFile "$FOLDER_AUDIO/"

    folderAudioFile=`echo $(ls $FOLDER_AUDIO/$title* | head -n1)` # extract file name from wildcard
    audioLength=${#folderAudioFile}
    audioFinalFile="${folderAudioFile:0:audioLength - 4}.mp3"

    if [ ! -f $audioFinalFile ]
    then
        echo "Extracting audio from video..."
        # @see https://www.igorkromin.net/index.php/2016/12/23/prevent-errors-during-ffmpeg-execution-in-a-loop/
        ffmpeg -i $folderAudioFile -f mp3 -ab 320000 -vn $audioFinalFile < /dev/null;
    fi

    echo "Cleaning temp files"
    rm $folderAudioFile;

    # exit 1;
done < $FILE_CSV

IFS=$OLDIFS