Selene is an audio/video converter for linux that uses bash scripts for transcoding the input files. The scripts can use any command line utility for encoding the input and Selene will display the progress along with options to pause/resume/shutdown, etc.
Since the conversion process is driven by bash scripts, this makes Selene extremely flexible. Bash scripts can be written for a wide variety of transcoding tasks.
Install Selene Media Encoder in ubuntu
Open the terminal and run the following commands
sudo apt-add-repository -y ppa:teejee2008/ppa
sudo aptitude update
sudo aptitude install selene