Curlew is an easy to use, Free and Open-Source Multimedia converter for Linux.
미스틱
Easy to use and elegant Multimedia converter.
사운드 변환기
soundKonverter is a frontend to various audio converters.
데드비프
DeaDBeeF lets you play variety of audio formats, convert between them, customize the UI almost any way you want, and use many additional plugins which can extend it even more.
Ciano
The ciano is a multimedia converter for all the format you need.