plaympeg: 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/plaympeg - from package: smpeg-plaympeg

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

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