qmp3info: 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/qmp3info - from package: quelcom

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

Error in other languages:
qmp3info: bevel nie gevind nie
qmp3info: comandă negăsită
qmp3info: comando não encontrado
qmp3info: commande introuvable
qmp3info: command not found
qmp3info: käsku ei ole
qmp3info: không tìm thấy lệnh
qmp3info: komanda nerasta
qmp3info: Kommando nicht gefunden.
qmp3info: kommandot finns inte
qmp3info: komut yok
qmp3info: nie znaleziono polecenia
qmp3info: níor aimsíodh an t-ordú
qmp3info: no se encontró la orden
qmp3info: no s'ha trobat l'ordre
qmp3info: opdracht niet gevonden
qmp3info: parancs nem található
qmp3info: perintah tidak ditemukan
qmp3info: príkaz nenájdený
qmp3info: příkaz nenalezen
qmp3info: команда не найдена
qmp3info: командата не е открита
qmp3info: 命令找不到
qmp3info: コマンドが見つかりません