stretchplayer: 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/lib/debug/usr/bin/stretchplayer - from package: stretchplayer-dbg
/usr/bin/stretchplayer - from package: stretchplayer

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