theora_dump_video: 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/theora_dump_video - from package: theora-tools

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

On Debian possible default full paths are:

/usr/bin/theora_dump_video - from package: libtheora-bin

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

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