tsfilter: command not found

Have You tried accessing the binary with the full path?

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/tsfilter - from package: opencaster

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