RGBtoYUV422: 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/RGBtoYUV422 - from package: dirac

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

Error in other languages:
RGBtoYUV422: bevel nie gevind nie
RGBtoYUV422: comandă negăsită
RGBtoYUV422: comando não encontrado
RGBtoYUV422: commande introuvable
RGBtoYUV422: command not found
RGBtoYUV422: käsku ei ole
RGBtoYUV422: không tìm thấy lệnh
RGBtoYUV422: komanda nerasta
RGBtoYUV422: Kommando nicht gefunden.
RGBtoYUV422: kommandot finns inte
RGBtoYUV422: komut yok
RGBtoYUV422: nie znaleziono polecenia
RGBtoYUV422: níor aimsíodh an t-ordú
RGBtoYUV422: no se encontró la orden
RGBtoYUV422: no s'ha trobat l'ordre
RGBtoYUV422: opdracht niet gevonden
RGBtoYUV422: parancs nem található
RGBtoYUV422: perintah tidak ditemukan
RGBtoYUV422: príkaz nenájdený
RGBtoYUV422: příkaz nenalezen
RGBtoYUV422: команда не найдена
RGBtoYUV422: командата не е открита
RGBtoYUV422: 命令找不到
RGBtoYUV422: コマンドが見つかりません