lavpipe: 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/lavpipe - from package: mjpegtools

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

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