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Smooth Streaming Format SDK 1.0 Beta 2

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The IIS Smooth Streaming Format SDK 1.0 Beta 2 provides documentation, tools, and samples you can use to create software programs that package encoded video and audio bitstreams for on-demand and live Smooth Streaming scenarios. In addition, the SDK supports the encryption of content using Microsoft PlayReady DRM.

The following are the major components of the Smooth Streaming Format (SSF) SDK:

  • A static-linked packaging library (SSFsdk.lib), along with appropriate header files
  • Sample binaries (dshowhlp.lib)
  • Sample code and documentation

The Smooth Streaming Format SDK API has been designed to handle any supported type of encoded video and audio bitstream (i.e. H.264, VC-1, WMA, AAC). Encoding applications will use this API to convert encoded bitstreams into fragmented MP4 (f-MP4) files that are compliant with IIS Smooth Streaming and the Protected Interoperable File Format (PIFF) specification.


The Smooth Streaming Format SDK is designed for several specific scenarios. Check the list below to see if the SDK aligns well with your business needs:

  • Mux encoded (VC-1/WMA, H.264/AAC) video and audio samples into fragmented MP4 chunks
  • Generate valid Smooth Streaming files and manifests inside an encoding application
  • Validate existing output Smooth Streaming files against the latest format spec
  • Encrypt new or existing Smooth Streaming content using Play Ready DRM.
  • Create a software application that can broadcast content via Smooth Streaming with low latency


The overall workflow is as follows. The encoding application reads in master- or mezzanine-level file sources and encodes them into VC-1 closed GOP and WMA audio samples, or H.264 format and AAC audio samples. These samples are fed into the input of the Format SDK. The encoding application controls the flow of samples going into the SDK and requests formatted MP4 fragments when appropriate. The encoding application then writes the fragments to disk as .ismv and .isma files. The encoding application also requests the valid manifest files from the SDK and writes those to disk. The files, compliant with IIS Smooth Streaming and the Protected Interoperable File Format (PIFF), are now ready to be played from the IIS Server.

To help you visualize, here is a workflow diagram.

IIS Smooth Streaming Format SDK Workflow

To see Smooth Streaming in action, check out the Experience Smooth Streaming page, where you can simulate different bandwidths and see how Smooth Streaming responds. To learn more, visit the IIS Media forum.

More IIS Media Information