In venbe.com we use the Flash video format, a format that minimize the size of the videos with a good quality.

If you are a Windows user you can try Riva FLV Encoder 2.0. Click here to download it . Is very easy to use. In input->browse choose the video to convert, in output->browse choose the new .flv video destination. Then, if you want, you can select some options and finally click in Encode and you will be able to upload the video in venbe.com.

If you are a MAC user , you can use FFMPEGX, for free. You can download it in http://www.ffmpegx.com/

If you are a Linux user, you can use for example the tools ffmpeg and flvtool2