File format conversion made simple

Format Junkie is an  Graphical  application which gives you an  easy file format manipulation facility on your desktop. The home page of Format Junkie is  here . It is available in launch pad so that you can quickly install it  on Ubuntu .
Some of the  file conversion  capabilities are

a) Audio: Conversion between the audio formats: mp3, mp2, wav, ogg, wma, flac, m4r, m4a and aac
b) Video: Conversion between the video formats: avi, ogv, vob, mp4, vob, flv, 3gp, mpg, mkv, wmv
c) Image: Conversion between the image formats: jpg, png, ico, bmp, svg, tif, pcx, pdf, tga, pnm
d) Iso|Cso Create an iso with selected files, convert iso to cso and vice versa.
e) Advanced Encode subtitles to an avi file.

Format Junkie Installation:
  Add the ppa to your machine

sudo add-apt-repository ppa:format-junkie-team/release

  Install format junkiee

sudo apt-get update
sudo apt-get install formatjunkie

After successful installation, you can open up the application from the Unity 'Dash'   Here is a screen shot.