extract_mpeg2: 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/extract_mpeg2 - from package: mpeg2dec

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

Error in other languages:
extract_mpeg2: bevel nie gevind nie
extract_mpeg2: comandă negăsită
extract_mpeg2: comando não encontrado
extract_mpeg2: commande introuvable
extract_mpeg2: command not found
extract_mpeg2: käsku ei ole
extract_mpeg2: không tìm thấy lệnh
extract_mpeg2: komanda nerasta
extract_mpeg2: Kommando nicht gefunden.
extract_mpeg2: kommandot finns inte
extract_mpeg2: komut yok
extract_mpeg2: nie znaleziono polecenia
extract_mpeg2: níor aimsíodh an t-ordú
extract_mpeg2: no se encontró la orden
extract_mpeg2: no s'ha trobat l'ordre
extract_mpeg2: opdracht niet gevonden
extract_mpeg2: parancs nem található
extract_mpeg2: perintah tidak ditemukan
extract_mpeg2: príkaz nenájdený
extract_mpeg2: příkaz nenalezen
extract_mpeg2: команда не найдена
extract_mpeg2: командата не е открита
extract_mpeg2: 命令找不到
extract_mpeg2: コマンドが見つかりません