m2ts2ts: 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/m2ts2ts - from package: tstools

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

Error in other languages:
m2ts2ts: bevel nie gevind nie
m2ts2ts: comandă negăsită
m2ts2ts: comando não encontrado
m2ts2ts: commande introuvable
m2ts2ts: command not found
m2ts2ts: käsku ei ole
m2ts2ts: không tìm thấy lệnh
m2ts2ts: komanda nerasta
m2ts2ts: Kommando nicht gefunden.
m2ts2ts: kommandot finns inte
m2ts2ts: komut yok
m2ts2ts: nie znaleziono polecenia
m2ts2ts: níor aimsíodh an t-ordú
m2ts2ts: no se encontró la orden
m2ts2ts: no s'ha trobat l'ordre
m2ts2ts: opdracht niet gevonden
m2ts2ts: parancs nem található
m2ts2ts: perintah tidak ditemukan
m2ts2ts: príkaz nenájdený
m2ts2ts: příkaz nenalezen
m2ts2ts: команда не найдена
m2ts2ts: командата не е открита
m2ts2ts: 命令找不到
m2ts2ts: コマンドが見つかりません