Curlew is an easy to use, Free and Open-Source Multimedia converter for Linux.

gImageReader

• Easy to use and clean user interface.
• Hide the advanced options with the ability to show them.
• Convert to more than 100 different formats.
• Allow to edit formats.
• Shutdown or suspend PC afer a conversion process.
• Show file informations (duration, remaining time, estimated size, progress value).
• Show file details using mediainfo.
• Allow to skip or remove file during conversion process.
• Preview file before conversion.