RGBtoYUV411: 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/RGBtoYUV411 - from package: dirac

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

Error in other languages:
RGBtoYUV411: bevel nie gevind nie
RGBtoYUV411: comandă negăsită
RGBtoYUV411: comando não encontrado
RGBtoYUV411: commande introuvable
RGBtoYUV411: command not found
RGBtoYUV411: käsku ei ole
RGBtoYUV411: không tìm thấy lệnh
RGBtoYUV411: komanda nerasta
RGBtoYUV411: Kommando nicht gefunden.
RGBtoYUV411: kommandot finns inte
RGBtoYUV411: komut yok
RGBtoYUV411: nie znaleziono polecenia
RGBtoYUV411: níor aimsíodh an t-ordú
RGBtoYUV411: no se encontró la orden
RGBtoYUV411: no s'ha trobat l'ordre
RGBtoYUV411: opdracht niet gevonden
RGBtoYUV411: parancs nem található
RGBtoYUV411: perintah tidak ditemukan
RGBtoYUV411: príkaz nenájdený
RGBtoYUV411: příkaz nenalezen
RGBtoYUV411: команда не найдена
RGBtoYUV411: командата не е открита
RGBtoYUV411: 命令找不到
RGBtoYUV411: コマンドが見つかりません