ogmdemux: 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/ogmdemux - from package: ogmtools

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

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