fluasfdemux is an ASF demuxer I kickstarted and participated in the development of when I was working as a multimedia engineer at Fluendo. ASF is the file format used for Windows Media files (audio, video or both). The demuxer works for files and streams and is pretty robust. It is a GStreamer plugin.
fluasfdemux is part of Fluendo’s flagship product, the ONEPLAY Codec Pack.