If you are looking for an easy tool to convert audio and video files under Ubuntu 14.10 or older, you can use Selene instead of using complicated Terminal commands to convert your files. Selene is an audio & video converter with GUI that suports the following file formats:

OGG OGV MKV
MP4 WEBM
OPUS AAC FLAC
MP3 WAV 

To install it under Ubuntu 14.10, enter these commands:

sudo

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Source:upubuntu