Xilisoft WMV MP4 Converter is a smart WMV MP4 converter to convert WMV/ASF to MP4 or MPEG4/H.264 video for MP4 players, and also a MP4 to WMV converter which helps you convert MP4 to WMV and MPEG4/H.264 to WMV video for Window media players. Besides, you can extract M4A/WMA audios from WMV/MP4 videos. A lot of parameters are provided in Xilisoft WMV MP4 Converter, thus you can change them to get the file with custom quality and file size.