tcdecode: 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/tcdecode - from package: transcode

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

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