For output, Silverlight Smooth Streaming creates the following file types:
*.ismv
MP4 container files that contain MP4 video fragments (and audio fragments if the video source also contains audio). Expression Encoder creates one .ismv file per bit rate, and the number of bit rates depends on the IIS Smooth Streaming preset that you select. For example, if you select a preset that specifies that the video be encoded using nine different bit rates, Expression Encoder creates nine .ismv files.
*.isma
MP4 container files that contain only audio fragments. If you encode an audio-only source, this is the file format that results. As with .ismv files, the number of .isma files that are created can vary depending on your output choice.
*.ism
An XML-based server manifest file that describes the available bit rates in the encoded presentation. A Smooth Streaming-enabled server uses this file.
*.ismc
An XML-based client manifest file that includes important information about the presentation, such as the available bit rates, the codecs that are used, and other information required by Smooth Streaming-compatible clients to view the presentation.
