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Building Filter Graphs to Write ASF Files (QASF)

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[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Applications based on DirectShow typically use one of three basic types of filter graphs when creating Windows Media–based content:

  • Filter graphs for converting or transcoding content from some other format into Windows Media Format.
  • Filter graphs for inserting content that is not Windows Media-based (native stream formats) into ASF files.
  • Filter graphs for capturing live data and encoding it immediately into Windows Media Format before saving it to disk.

Each type of filter graph is described in more detail in the following sections.

Section Description
Transcoding Files (QASF) Describes how to create file-transcoding filter graphs.
Inserting Native Stream Formats Into ASF Files (QASF) Describes how to place any type of compressed or non-compressed audio or video data into an ASF file.
Capturing Directly from a Device to an ASF File (QASF) Describes how to create capture filter graphs that output to an ASF file.