qtyuv4toyuv: 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/qtyuv4toyuv - from package: quicktime-utils

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

Error in other languages:
qtyuv4toyuv: bevel nie gevind nie
qtyuv4toyuv: comandă negăsită
qtyuv4toyuv: comando não encontrado
qtyuv4toyuv: commande introuvable
qtyuv4toyuv: command not found
qtyuv4toyuv: käsku ei ole
qtyuv4toyuv: không tìm thấy lệnh
qtyuv4toyuv: komanda nerasta
qtyuv4toyuv: Kommando nicht gefunden.
qtyuv4toyuv: kommandot finns inte
qtyuv4toyuv: komut yok
qtyuv4toyuv: nie znaleziono polecenia
qtyuv4toyuv: níor aimsíodh an t-ordú
qtyuv4toyuv: no se encontró la orden
qtyuv4toyuv: no s'ha trobat l'ordre
qtyuv4toyuv: opdracht niet gevonden
qtyuv4toyuv: parancs nem található
qtyuv4toyuv: perintah tidak ditemukan
qtyuv4toyuv: príkaz nenájdený
qtyuv4toyuv: příkaz nenalezen
qtyuv4toyuv: команда не найдена
qtyuv4toyuv: командата не е открита
qtyuv4toyuv: 命令找不到
qtyuv4toyuv: コマンドが見つかりません