mpgsplit: 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 Debian possible default full paths are:

/usr/bin/mpgsplit - from package: mpgtx

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

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