cut_and_concat.sh

function cut_and_concat ()
{

    SOURCE=$PWD/$1
    OUTPUT=$PWD/$2
    OPENING=$PWD/$3
    START_AT=$4
    END_AT=$5

    TIMESTAMP=$(date +"%Y%m%d%H%M%S")
    DIR="$PWD/output_${TIMESTAMP}"
    mkdir -p $DIR

    TMP_OUTPUT="$DIR/tmp.mp4"
    TMP_LIST="$DIR/list.txt"
    echo -e "file '${OPENING}'\nfile '${TMP_OUTPUT}'\n" > $TMP_LIST

    ffmpeg -y -i ${SOURCE} -ss ${START_AT} -t ${END_AT} "${TMP_OUTPUT}"
    ffmpeg -y -f concat -safe 0 -i $TMP_LIST "${OUTPUT}"

    rm -rf $DIR
}