lavtrans: 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/lavtrans - from package: mjpegtools

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

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