Streaming technology

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Specification on Streaming
Technology
??????? ??19? ??? 48? ???
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??? ????
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?????

• ?????(Streaming)????????
• ????,????????????,?
• ???????????????????
• ??????????????????
• ??????,????????????
• ?????????????
• (? Windows MediaPlayer, Real Player?
• QuickTime Player Real Player)?

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Streaming???????

• 1.??????(progressive streaming)
• ??????????????,??????,
• ????????????
• 2.??????(real time streaming)
• ????????????????

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Streaming????

• Streaming??????HTTP/TCP???????,??RTP/UDP??????
  ????

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??????????????????
Real System Windows Media QuickTime
??? Real Player Media Player QuickTime Player Real Player
???? RTSP (UDP RTP) MMS (UDP RTP) RTSP(UDP RTP)
????http? Yes Yes Yes
????SMIL? Yes Yes Yes
????????(multicast) ? Yes Yes Yes
?????? No Yes Yes
??????? Windows/Linux Windows MAC OS X
???/????? MP3?MOV ASF?MP3 MOV
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• ?/????
• MPEG-4????????(Unicast)????
• ?(Multicast)?????????????,
• ????????????????,?MPEG-4?????????????
• ????????????????,??
• ???????????????? ?

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• ????

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• ????

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??????????
? ? ???? ??????,????,??????????
? ? ????????? ???????????
? ? ?????? ????????????????????,???????????
? ? ????????? ???????,????????????????????
? ? ??????????? ???????????????,?????????????????,????????????????
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??????????????
?????? ???? wmv rm mov
???? ???? 256k ???? 320x240 ???? 256k ???? 320x240 ???????,??????????
?????? ?10.6 ?11 ?11.2
??????? 1.64MB 4.74MB 11 MB
?? ? ?? ?
?? ? ?? ?
?????? avi ????,??1??,?????212MB,720x680 ????????Pentium 4, CPU2.00GHz, 786KB RAM ?????? avi ????,??1??,?????212MB,720x680 ????????Pentium 4, CPU2.00GHz, 786KB RAM ?????? avi ????,??1??,?????212MB,720x680 ????????Pentium 4, CPU2.00GHz, 786KB RAM ?????? avi ????,??1??,?????212MB,720x680 ????????Pentium 4, CPU2.00GHz, 786KB RAM
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??? ??????????
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????

• ??????????????????
• ?????????????????
• ??????????????????
• ???????????,?DVD/NTSC
• ????,??30????????????31.1MB??????

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?????????

• MPEG1
• 1989?7?????????
• 1992?11???VCD??????
• ???????30frames?
• ????352240(NTSC??????),
• ??352288(PAL??????)?
• ??650MB?CD????74??????
• ???????1.5Mbps?

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• MPEG2
• MPEG2????????AV????,???????????????????MPEG2???
  ??STB??????DVD?D-VHS???????MPEG2???MPEG2????????,?
  ????MPEG2????????????????,????,???MPEG2???????????
  ??

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• MPEG-4
• ?1995?7???????,1998?10??????MPEG4
  V1,1999?12??????MPEG4 V2,???2000???????,??????????
  ????????MPEG?????
• ????????,???????????(????)??????????
• ?????38384kbps?

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MPEG4?? ?Media Object?

• ?????????
• Still images (e.g. as a fixed background)
• Video objects (e.g. a talking person - without
  the background)
• Audio objects (e.g. the voice associated with
  that person, background music)

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MPEG4??????
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????MPEG4????(scene)???

• ???????????media object???????
• ??media object???
• ??(group)??media object??????/??(compound)?media
  object
• ???media object???????, ??????, ????,
  ????(animation parameter)
• ??????(????, ???????)

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• MPEG-2?MPEG-4???
• ?MPEG???,???MPEG-4?????????????????PAL??NTSC???
  ???????(16??, 48 kHz)?????CD-ROM?????700
  MB???????110?????????????????,MPEG-2??????????????
  ??11?????????MPEG-2???????? ????,MPEG-4???????????
  ?
• ???????????5 Kbit/s?10 Mbit/s???
• ?,????????2 Kbit/s ?24 Kbit/s?????????,????????
  ???????,????????MPEG-2????????????

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• MP3
• ???MPEG1 Layer3???,????????
• MPEG3?
• MP3??ISO/MPEG Audio Coding Standard????
• ???????????????????????
• ?????????????????,??CD??
• ???112128kbps,?????????????
• ??,????????????CD??????
• ?,???????,???????????,?
• ?????MP3??????????

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???????????
???? VCD DVD DivX WMV/ASF RM ????
????? 352240 352288 720480 720576 640480 320240 320240 240180 320240 240180 720480 720576
?????? MPEG1 MPEG2 MPEG4 MPEG4 RM DV
?????? MPEG1- Layer2 MPEG1 MPEG2 AC3, DTS PCM MP3 WMA MPEG4 RM DV
???? (MB/?) 10MB 30-70 MB 1-10 MB 1-5 MB 1-5 MB 216 MB
CD?????? (????) 74? 15-20? 60-180? 120-300? 120-300? 3?
DVD?????? (????) --- 2-4?? 13-26?? 13-26?? 26-40?? 20?
???CPU??? ? ?? ?? ? ? ?
?/???? ? ?? ? ? ? ??
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??

• ??????????????????
• ?????????????????,
• ??????????????????
• ??????????????????
• ??????????????????
• ???,?????????????