playdv: 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 CentOS possible default full paths are:

/usr/bin/playdv - from package: libdv-tools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/playdv - from package: libdv-bin

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

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