mpeg2desc: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/mpeg2desc - from package: dvdauthor

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mpeg2desc - from package: dvdauthor

You may install the required package with command apt-get install {package}

Error in other languages:
mpeg2desc: bevel nie gevind nie
mpeg2desc: comandă negăsită
mpeg2desc: comando não encontrado
mpeg2desc: commande introuvable
mpeg2desc: command not found
mpeg2desc: käsku ei ole
mpeg2desc: không tìm thấy lệnh
mpeg2desc: komanda nerasta
mpeg2desc: Kommando nicht gefunden.
mpeg2desc: kommandot finns inte
mpeg2desc: komut yok
mpeg2desc: nie znaleziono polecenia
mpeg2desc: níor aimsíodh an t-ordú
mpeg2desc: no se encontró la orden
mpeg2desc: no s'ha trobat l'ordre
mpeg2desc: opdracht niet gevonden
mpeg2desc: parancs nem található
mpeg2desc: perintah tidak ditemukan
mpeg2desc: príkaz nenájdený
mpeg2desc: příkaz nenalezen
mpeg2desc: команда не найдена
mpeg2desc: командата не е открита
mpeg2desc: 命令找不到
mpeg2desc: コマンドが見つかりません