Ciano is a free and open source multimedia file converter for Linux. Using Ciano, you can convert video, audio and image file formats. It supports MP4, MPG, AVI, WMV, FLV, MKV, 3GP, MOV, VOB, OGV, WEBM video file formats, MP3, WMA, OGG, WAV, AAC, FLAC, AIFF, MMF, M4A audio file formats and JPG, BMP, PNG, TIF, GIF, TGA image file formats. It is basically designed for elementary OS but you can install it on any other linux distribution. It uses FFmpeg and ImageMagick to convert the files. One of the important feature is you can convert multiple files at one and same time. It is released under open source GNU General Public License v3.0 license.