Miro (previously known as Democracy Player) is a platform for Internet television and video. It allows you to download and watch videos from RSS feeds (including podcasts, video blogs, and BitTorrent feeds).
Install Miro 5.0.4 in ubuntu 12.04
Open the terminal and run the following commands
sudo add-apt-repository -y ppa:pcf/miro-releases
sudo apt-get update
sudo apt-get -y install miro