Overview[ edit ] Expression Windows expression encoder 4 is a transcoding and windows expression encoder 4 video editing program. It features a graphical user interface based on Windows Presentation Foundation WPF as well as a command line interface. It can export videos to H. It supports Silverlight player controls and Silverlight templates. Microsoft Expression Encoder is available in different editions: This version does not support H. Express edition is free of charge but feature-limited. This version has the same restrictions as the Pro edition without codecs, but also does not support live streaming. History[ edit ] Version 1. A beta of version 2. Version 2 was released to manufacturing in May Expression The first service pack added H. According to Microsoft, Expression Encoder 2 was not a replacement for Windows Media Encoderdespite having many similarities.