copy_metadata

function copy_metadata
{
    if [ $# -eq 2 ]
    then
        has_video=$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1 -pretty "$1")
        has_audio=$(ffprobe -v error -select_streams a -show_entries stream=codec_name -of default=noprint_wrappers=1 -pretty "$1")
        if [[ $has_video = *"codec_name"* ]] && [[ $has_audio = *"codec_name"* ]]
        then
            setting="-map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a"
        elif [[ $has_video = *"codec_name"* ]] && [[ -z "$has_audio" ]]
        then
            setting="-map_metadata:s:v 0:s:v"
        elif [[ -z "$has_video" ]] && [[ $has_audio = *"codec_name"* ]]
        then
            setting="-map_metadata:s:a 0:s:a"
        fi
        outname="${2%.*}"
        outname_ext="${2##*.}"
        ffmpeg -i "$1" -i "$2" -map 1 -c copy -map_metadata 0 ${setting} "${outname}"_new.$outname_ext
    else
        echo "\nTwo input files needed, first the one with the metadata that will be copied from and second the one without metadata that media streams will be copied from\n"
    fi
}