oggLength: 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/oggLength - from package: oggvideotools

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

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