qtdechunk: 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/qtdechunk - from package: quicktime-utils

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

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