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Advanced Streaming Format (ASF)

Advanced Streaming Format (ASF). By Hung-Chin Wang. What is ASF ?. An extensible file format be composed of one or more media streams include specification of some commonly used media types support the transmission of “ live content ” over a wide variety of network and protocols.

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Advanced Streaming Format (ASF)

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  1. Advanced Streaming Format (ASF) By Hung-Chin Wang

  2. What is ASF ? • An extensible file format • be composed of one or more media streams • include specification of some commonly used media types • support the transmission of “ live content ” • over a wide variety of network and protocols

  3. ASF Features (1) • Extensible Media Types • easy to define new media types • Component Download • Stream-specific information in the file header • Scalable Media Types • provide information for clients to interpret scalability options

  4. ASF Features (2) • Multiple Languages • support multiple languages • Author-specified Stream Prioritization • Bibliographic Information

  5. File Format Organization(1) • ASF Object definition • the base unit of organization - ASF Object • store in little-endian byte order

  6. File Format Organization(2) • High-level File Structure • three top-level objects • Header Object • Data Object • Index Object

  7. File Format Organization(3) • ASF Header Object • File Properties Object • Stream Properties Object • Language List Object • Content Description Object • Maker Object • Index Parameters Object • …………

  8. File Format Organization(4) • ASF Data Object • data units ( contain all multimedia data ) • ASF Index Object • Example

  9. File Properties Object

  10. Stream Properties Object

  11. Language List Object

  12. Standard ASF Media Types • Audio Media Type • Video Media Type • Image Media Type • Timecode Media Type • Text Media Type • MIDI Media Type • Command Media Type • Media-Objects(Hotspot) Media Type

  13. Index Parameters Object • Index Type • Nearest Data Unit • Nearest Object • Nearest Clean Point

  14. ASF Data Unit Definition

  15. Index Object

  16. Script Command Object

  17. Maker Object

  18. Other ASF Header SubObjects • Component Download Object • Stream Group Object • Scalable Object • Mutual Exclusion Object • ……...

  19. Conclusion • 如何將 media file 轉變成 asf 的檔案格式

  20. Thanks • Everyone

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