YUV420toYUV422: 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/YUV420toYUV422 - from package: dirac

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

Error in other languages:
YUV420toYUV422: bevel nie gevind nie
YUV420toYUV422: comandă negăsită
YUV420toYUV422: comando não encontrado
YUV420toYUV422: commande introuvable
YUV420toYUV422: command not found
YUV420toYUV422: käsku ei ole
YUV420toYUV422: không tìm thấy lệnh
YUV420toYUV422: komanda nerasta
YUV420toYUV422: Kommando nicht gefunden.
YUV420toYUV422: kommandot finns inte
YUV420toYUV422: komut yok
YUV420toYUV422: nie znaleziono polecenia
YUV420toYUV422: níor aimsíodh an t-ordú
YUV420toYUV422: no se encontró la orden
YUV420toYUV422: no s'ha trobat l'ordre
YUV420toYUV422: opdracht niet gevonden
YUV420toYUV422: parancs nem található
YUV420toYUV422: perintah tidak ditemukan
YUV420toYUV422: príkaz nenájdený
YUV420toYUV422: příkaz nenalezen
YUV420toYUV422: команда не найдена
YUV420toYUV422: командата не е открита
YUV420toYUV422: 命令找不到
YUV420toYUV422: コマンドが見つかりません