I have been used video converter for 3 years, because of my work, an editor of a website, I have to cut many videos a day, and combine, convert, edit them. So, I used various video converter, I think any video converter and leawo video converter are the best ones, for any video converter is very easy to use, and leawo video converter has a good convert speed with high quality. I use them both.
http://www.leawo.com/leawo-video-converter/