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

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

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

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

5. File Format Organization(1) File Format Organization(1) n ASF Object definition –the base unit of organization - ASF Object –store in little-endianbyte order

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

7. File Format Organization(3) n 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) n ASF Data Object –data units ( contain all multimedia data ) n ASF Index Object n Example

9. File Properties Object

10. Stream Properties Object

11. Language List Object

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

13. Index Parameters Object n 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 n Component Download Object n Stream Group Object n Scalable Object n Mutual Exclusion Object n ……...

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

20. Thanks n Everyone