ֵֻҵгššeȻ˽24СʱϵȲͬڴͳýص㣬ҪǾ̬ΪͼݣӰýõijַӡûθõں֡ͼֶ֧ý幦ܣȷӶŷ㡢ݵŵ㣬ֲֿʽIJ㣬ʹƶû""һɫΪƶӪձĵĻ⡣
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νýָûͨضŵر߲ŶýݵһֹʽýӦõһĺôûҪѺܳʱ佫ýȫصغܲţ轫ʼصصĻоͿԿʼţյݻԴԴ뵽ûӶάֲŵԣý岥ֻͨڿʼʱһЩʱӡýϵͳҪزϵͳӵö࣬Ҫýıʹ似ܺõؽһ𣬲ȷûڸӵ绷ҲܵõȶIJ
ýڴǰҪȾЧѹԼٶԴռʡĿǰõƵMPEG-2MPEG-4H.261H.263H.264Window MediaƵReal SystemƵȣMP3MPEG AACWindow Media ƵAMRȣͼJPEGJPEG2000ȡýɵֻ˽ϢýͬʵϵͳϢ˱ĶýݻҪ֯ΪضϵͳʽĶýļý崫ǴУĿǰõļʽMPEG-2ϵͳMP4˾ASFRealļʽQuickTimeļʽԼ3G߷3GPP3GPP2ȵȡ
ýʵʱӦУֳý㲥ݵǰ״ûն˲ýһ߱һ߱ýûķʵʱӦУýݿԱȱɶýļ洢ڴСṩýʱýֱӶȡЩļûʽ豸Ҫϵ͡ĿǰýںһַʽҪýһĻӦ״û豸
ĿǰӦһģҪõķУýļеƵתΪһضʺͼߴ߰ͬһƵݱɶвͬʺͼߴȻӦѡһʵûɵҪһΪض紫Эݰ紫䣬粢ܱ֤ܹʱȫȷرûյݰҪǰ루FECЩýݾͿͨ紫ûĿǰõĴЭRTP/RTCPHTTPMMS
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ͨýϵͳеķû䲢ǵͨţǰᵽشʵϣû˻ᴫݸ෴Ϣն豸ٶȻᴫӦģʵʱӦЩϢܴû˵ĶʡݰյʱϢû״̬ϢҲᴫݸƵǰ״ӶӦݵķͲԡʵýϵͳڶýϢһdzӵϵͳĿǰҪIJƷ˾Windows Media Real˾Real Systemƻ˾QuickTimeWindows Mediaϵͳгռ
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ʵýĹؼʽ䡣ʽĶܹ㷺Ҫָͨ紫ý壨ƵƵļܳơ
ʽΪ˳ʽʵʱʽ䣺
˳ʽ˳طʽļͬʱûɹۿ߽Ŀڸʱ̣ûֻܹۿصDz֣δصIJַ֣ʽʵʱʽڴڼûӵٶȽе˳ʽ䲻ʺϳƬκҪƵĿ署˵ʾȣҲֳ֧㲥ϸ˵һֵ㲥
ʵʱʽɱ֤ýźŴƥ䣬ʵʱۿĿʵʱHTTPʽ䲻ͬҪרõý봫Э顣ʵʱʽʵʱͣرʺֳ¼Ҳ֧ʣûɶԹۿݽпˡϣʵʱһžͲֹͣɽͣ
ʽģʽһʹRTP/UDPRTSP/TCPͨЭA/VAudio/VideoServerϵضһA/V PlayerڿͻĿĵַͼ1ʾʽϵͳһ㶼ҪһרõķͲ
ƶýĴЭ飺
1ʵʱЭRTPRTCP
RTPReal-time Transport ProtocolInternetԶýһִЭ飬һһһԶĴṩʱϢʵͬRTPͨʹUDPݣҲTCPATMЭ֮ϹӦóʼһRTPỰʱʹõ˿ڣһRTPһRTCPRTPΪ˳ݰṩɿĴͻƣҲṩƻӵƣRTCPṩЩͨRTP㷨Ϊһʵ֣ΪӦóһ֡
RTCPReal-time Transport Control ProtocolRTPͬṩƺӵƷRTPỰڼ䣬ԵشRTCPЩкѷݰʧݰͳݣɸЩϢ̬ظı䴫ʣıЧغ͡RTPRTCPʹÿЧؽзӶСߴЧʣdzʺϴϵʵʱݡ
2ʵʱЭRTSP
ʵʱЭRTSPReal-time Streaming ProtocolRealNetworksNetscapeͬһЭ飬ʹһԶӦóЧͨIP紫ͶýݡRTSPϵṹλRTPRTCP֮ϣʹTCPRTPݴ䡣HTTPȣRTP͵ǶýݣHTTPHTMLʹRTSPʱͻͷɷҲ˵RTSP˫HTTPɿͻӦ
3ԴԤЭRSVP
ƵʱҵУдƵϢ˴Ҫ֮⣬RSVPResource Reservation ProtocolһڿInternetԴԤЭ飬ͨȡԤһԴĴʩһ̶Ϊý崫ṩQoSijЩϵͳƵ鹤vicͼRSVP
3GPP UMTSƵý뼼淶ITU-T H.263 profile 0 level 10ҲPSSʹõƵ⣬PSSӦ֧H.263 Profile 3 Level 10MPEG-4 Visual Simple Profile Level 0ʵӦУƵѡH.264ҲҵĹ㷺Ȥ3GPP PSS R6Ҳڻǽ淶
ƶý岥
ƶý崫ƵݶH264Ƶѹ㷨ѹߴĵʹ (15-25 kpbs) ԴͼøٵĴͬƵƶն˵ýƵЩĴң REAL гԭرƵֻϵӦãԶӦÿ˵ҪƵڸƶնӦֲҪƽ̨У
Pocket PCƽ̨
Dopod 686/696
Lenovo ET180/560
Daxian CU928/Eten P300B
Symbianƽ̨
Nokia 7650/6600/3650/7610/Nokia6260/6630/7610/6620/3620/3660/3600/3650/N-Gage/
P802/P908
Simens sx1/Sendo x
Panasonic X700/
Samsung SGH-D710
Linuxƽ̨
Motorola A760
Smartphoneƽ̨
Dopod515/535
Moto8380/8390
ƶýҪӦ
1Ϣ
ƾϢźͼʱϢȷûֻͨĽŻվ㼴ɻȡϢҲͨĵķʽʹϢͷϢݿýķʽṩ
2ַ
ͨƵƵԼӽĿľƬزź߲šṩƶϷֻӵȷ
3ͨŷ
ýݵIJšƵ绰ȣʹǵĹͨӷ㣬Ϊḻʡ
4ط
Ҫͨغͼͥءͨʹܹͨʵʱ쿴ٹ·Ҫ·Ľͨ״ɲ鿴ָ··;ͨλ·εĽͨͥؿʵʱӼͥͰ칫ҵֻ谲װWebƵӵInternetϾͿͨƶն˻PCӼͥ칫ҡ
5λ
ṩͼҿԤ羰ʤԤ͵ӰƱȡδ꣬ƶýҵõܴķչն˵IJϷչʵ֡
ġƶýķչ
ƶýҵĿչƶֵµϣ2.5G3GԼ3GķչҲʹý弼Աõն豸ϣĿǰйͨ˾ṩCDMA 1xûԴﵽ100kbit/sѾ㹻ṩQCIFСý3GӦãûԴﵽ384kbit/sһ棬ֻ豸ԽԽǿ洢ռԽԽ˵SMART PhonePocket PCȸ߶ֻһеֻNokia 6610ҲʵֻH.264롣
ýӦöԵǰıʹ似˸սȣԣ״ȶȥɵĴʵIJ⣬ֳ豸ƶٶȺλҲصӰ쵽ʣ˸ЧĿӦı뼼ҪΣŵĻҲҪŵӵĶ࣬ݵҲҪ࣬ѹԴdzУɴͼɢýԴŵҪܺõݴƶýҵķչУ⣺
1 խ
CDMA1XGPRSֱΪǰйͨйƶ2.5G缼紫֮ǰ˺ܴ,ȻʮޡCDMA1X۷ֵشʴﵽ144kbpsʵ£ȶĴͨ70kbpsҡGRPSϿԴﵽ115kbpsʵ£ȶĴͨ20kbpsҡʹûӣܽһ½ĸأ紫ĿԴӡ
2 ƶն˴ͣڴС
ȻĿǰгϻARM9ͬоƬĸ߶ֻѾԽԽֻ࣬еͶûӴľг̻ʹøն˳ҶеͶûΪӡĿǰռгݶġֻȻõARM7ϵеоƬڼʮMIPSҡ
Ŀǰƶն˵ڴͨҲȽޡгBREWֻԤӦóĶ̬ڴͨ700KBңJ2MEֻԤӦóĶ̬ڴͨ64KB128KBSymbian/Linux/Windows Mobileȸ߶ֻԤӦóĶ̬ڴ1-4MBҡ
3 նϵͳƽ̨LCD
PCƽ̨ԣƶն˵ϵͳƽ̨ԣϵͳƽ̨SymbianLinuxWindows MobilePalm OSԼһЩ˽ƽ̨ƶնϵͳںܳһʱڽڡΪṩһͳһֻӦóлJ2MEBREWӦ˶ͬijҶJ2MEBREW֧ͨڲ졣ƽ̨ĶLCDСһʹʵӦƶն˵ӦóѶȷdz
4 ƶն˵ĵԴ
ֻ豸ԽԽǿɵعģ˱봦̫ӣܹû豸ĵýĽպʹԴҲƶýһоȵ㡣
ĵַ:http://www.cnonline.org/2005/article/7560.html