lavaddwav: 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/lavaddwav - from package: mjpegtools

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

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