I recommend you Kigo Video Converter.

Actually, it is easy for developers to design a program to convert video file formats.

However, some paid programs have extra functions like clip segment, crop, add watermark and more.

Kigo Video Converter is an all-in-one video converter. View more info at  www.kigo-video-converter.com 

Wonderful software,  star programers!

Some examples of software:-

1) Opera (Web Browser)
2) Microsoft Word (Word Processing)
3) Microsoft Excel (Spreadsheet software)
5) MySQL (Database Software)
6) Microsoft Powerpoint (Presentation Software)