9 dec SURFnet/SEC Seminar1 Streaming technologie Egon Verharen SURFnet Innovatie management Inhoud Definities Formaten.

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Presentation transcript:

9 dec SURFnet/SEC Seminar1 Streaming technologie Egon Verharen SURFnet Innovatie management Inhoud Definities Formaten Protocollen Distributie Architecturen Codecs Servers Clients Innovatie Projecten Toekomst Demo inleiding

9 dec SURFnet/SEC Seminar2 Definities “Streaming” is buzz-woord. –Is een bijvoegelijk naamwoord Focus: Streaming MEDIA Definities terug te voeren op verschillende aspecten: –Push vs. Pull –Client-oriented vs. server-oriented –on-demand vs. live –Streaming media is the simultaneous transfer of video, audio and data [multimedia data] so that it is received as a continuous real-time stream –Streamed data is transmitted by a server application and received and displayed in real-time by client applications. These applications can start displaying video or playing back audio as soon as enough data has been received and stored in the receiving station's buffer

9 dec SURFnet/SEC Seminar3 Formaten Aspecten: –Bitrates (constant, variable) –Framesize –QoS Bandbreedte (bij eind-gebruiker) Real SureStream, simulcast Standaarden –ISO/IEC (int.l. org for standardization/int.l. electrotechnical commission) Moving Pictures Experts Group (ISO/IEC JTC1/SC29/WG11) –ITU (int.l. telecommunication union) Series H (video), Series G (audio) (ITU-T SG16)

9 dec SURFnet/SEC Seminar4 Formaten (cont. MPEG) MPEG1 1,5 mb/s; VHS; part3=audio=MP3 MPEG2 6-8 mb/s; digitale TV MPEG4 lagere bitrate (better compr.); multimedia appl. layers (transparent info), content protection, QoS MPEG7 metadata model bovenop MPEG1/2/4; zoeken, filteren, processen

9 dec SURFnet/SEC Seminar5 Formaten (cont. MPEG) MPEG1 1,5 mb/s; VHS; part3=audio=MP3 MPEG2 6-8 mb/s; digitale TV MPEG4 lagere bitrate (better compr.); multimedia appl. layers (transparent info), content protection, QoS MPEG7 metadata model bovenop MPEG1/2/4; zoeken, filteren, processen

9 dec SURFnet/SEC Seminar6 Formaten (cont. MPEG) MPEG1 1,5 mb/s; VHS; part3=audio=MP3 MPEG2 6-8 mb/s; digitale TV MPEG4 lagere bitrate (better compr.); multimedia appl. layers (transparent info), content protection, QoS MPEG7 metadata model bovenop MPEG1/2/4; zoeken, filteren, processen

9 dec SURFnet/SEC Seminar7 Formaten (cont. Video en Audio) Video –ITU-T Series H - Audiovisual and multimedia systems –H.261 H.263 –DV (Digital Video) Audio –MP3 = MPEG-1 audio layer 3 –Series G - Transmission systems and media, digital systems and networks –G711, 722, 723.1, 726, 728, 729

9 dec SURFnet/SEC Seminar8 Protocollen Streaming Media Protocols are protocols that are being used to support the real-time delivery of multimedia data TCP vs. UDP HTTP –progressive download RTP –real time protocol –UDP –payload

9 dec SURFnet/SEC Seminar9 Protocollen (cont. RTSP) RTSP –Real Time Streaming Protocol designed to be an open standard aims to provide an extensible framework to enable controlled delivery of real-time data, such as audio and video. Denk: videocontrole (play, pauze, stop, back, forward) –

9 dec SURFnet/SEC Seminar10 Distributie Scenario’s –Broadcast vs. Groupcast vs. Personcast (Video-on- demand) Techniek –Unicast –Multicast cookbook contact SURFnet Netwerkdiensten

9 dec SURFnet/SEC Seminar11 Architecturen RealMedia –codecs: RealVideo, RealAudio –streaming formaat: RealVideo, RealAudio, met plugins (bijv. BitCasting) MPEG1, MP3 –SureStream: multiple bitrate encodings, bandwidth negotiation –RealText, RealPix –SMIL (Synchronized Multimedia Integration Language) –Standaarden: RTSP, RTP (RDP)

9 dec SURFnet/SEC Seminar12 Architecturen (cont.) Apple Quicktime –ondersteuning vele codecs streaming RTP payloads; Sorensen: VBR, CBR –streaming formaat: Quicktime (hinted movies) –plug-in architectuur –tracks & effects & interactivity –standaarden: RTSP, RTP –zie demo

9 dec SURFnet/SEC Seminar13 Architecturen (cont.) Microsoft Windows Media Technologies –NetShow, DirectShow/ActiveMovie, Video for Windows –codecs: Windows Media Audio (WMA), MPEG-4 v3, ACELP (voice) –streaming formaat: ASF (advanced streaming format) –Multi-Datarate Encoding, Intelligent Transmission, Media rights –standaarden: ??; WMM –office integratie !! (bijv. streaming powerpoint) –Meest ‘compatible’ client (player)

9 dec SURFnet/SEC Seminar14 Codecs –MPEG1, MPEG2, MPEG4 (zie notes) –MP3 = MPEG-1 audio layer 3 –Qualcomm PureVoice –Qdesign Music (stereo audio for dialup data rates en fast processor) –a2b (AAC, high fidelity, faster data rates, encryption) –liquid audio (arch., AAC, hifi, encryption, licensing, watermarking) –java based: emblaze, GTS –Sorensen (video, both dialup and cable modem data rates) –Vivo (VIV), Vxtreme (VXF), VDOnet –

9 dec SURFnet/SEC Seminar15 Servers Aspecten –opslag –media pomp –netwerk (bandbreedte) –on-demand vs. live –asset management Voorbeelden –“Low end” Apple Quicktime Real G2 Microsoft Windows Media

9 dec SURFnet/SEC Seminar16 Servers (cont. Voorbeelden) –“high end” FVC.COM I-Studio Cisco IP/TV –standaarden ondersteuning IBM Videocharger –Digital Library; architectuur; interactiviteit –standaarden ondersteuning SGI Mediabase Ncube/Oracle MediaCUBE/Videoserver... Frameworks –SUN & IBM Java media framework –unified architecture for the playback, synchronization, capture, transmission and transcode of media -- including streaming audio and video -- across most major operating systems

9 dec SURFnet/SEC Seminar17 Clients Aspecten –Synchronisatie –Buffer –Multicast Voorbeelden –FVC.COM I-viewer –Cisco IP/TV viewer –IBM Videocharger client –Apple Quicktime client –Microsoft Windows Media Player –Mbone tools SDR, Vic, Rat, …

9 dec SURFnet/SEC Seminar18 Innovatie Projecten VIP –partners: TI, NOB Interactive, IBM, SURFnet –metadata, searching & indexing –watermarking, copyright protection –accounting & billing –distributie (multicast, QoS) SURFnet-TV –now FVC.COM I-studio –MPEG1 en H.261/PCM/text streaming –live events en TV

9 dec SURFnet/SEC Seminar19 Toekomst projecten SURFnet-TV –netcasten van voor (een deel van) de doelgroep interessant materiaal (wetenschapsTV) –meerdere kanalen –Scheduled (Electronic Program Guide) en Live –doorgifte soortgelijke kanalen (bijv. Funet-TV, Canarie) High Quality –DV, HDTV experimenten Reverse Content Provision Altijd op zoek naar interessante projecten/partners. Maak jezelf bekend svp.

9 dec SURFnet/SEC Seminar20 Toekomst Kwaliteit –DV -> HDTV Inhoud –3D (bijv. VRML, QuicktimeVR) Codecs –fractal –VBR Standaarden –RTP/RTSP, incl. authenticatie, MPEG4 & MPEG7 Meer streaming servers/clients –betere toegangsnetwerken –Networked Video (IP networks) –media & asset management

9 dec SURFnet/SEC Seminar21 Demo inleiding Seminar streamen via Real G2 (unicast en multicast SureStream) en SURFnet-TV (I-studio; MPEG1)