YUV420toRGB: 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/YUV420toRGB - from package: dirac

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

Error in other languages:
YUV420toRGB: bevel nie gevind nie
YUV420toRGB: comandă negăsită
YUV420toRGB: comando não encontrado
YUV420toRGB: commande introuvable
YUV420toRGB: command not found
YUV420toRGB: käsku ei ole
YUV420toRGB: không tìm thấy lệnh
YUV420toRGB: komanda nerasta
YUV420toRGB: Kommando nicht gefunden.
YUV420toRGB: kommandot finns inte
YUV420toRGB: komut yok
YUV420toRGB: nie znaleziono polecenia
YUV420toRGB: níor aimsíodh an t-ordú
YUV420toRGB: no se encontró la orden
YUV420toRGB: no s'ha trobat l'ordre
YUV420toRGB: opdracht niet gevonden
YUV420toRGB: parancs nem található
YUV420toRGB: perintah tidak ditemukan
YUV420toRGB: príkaz nenájdený
YUV420toRGB: příkaz nenalezen
YUV420toRGB: команда не найдена
YUV420toRGB: командата не е открита
YUV420toRGB: 命令找不到
YUV420toRGB: コマンドが見つかりません