RGBtoUYVY: 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/RGBtoUYVY - from package: dirac

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

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