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What is ASF – Advanced Streaming Format?

Microsoft’s new audio/video format, meant specifically for streaming purposes. It doesn’t specify how the video or audio should be encoded, but instead just specifies the structure of the video/audio stream. This means that ASF files can be encoded with basically any audio/video codec and would still be in ASF format.

Many times ASF is confused with Microsoft’s implementation of MPEG-4 video format, because most of the ASF streams are encoded using this technology.