Programmobjekt-basierter Internet-Rundfunk

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1 Programmobjekt-basierter Internet-Rundfunk Programmobjekt-basierter Internet-Rundfunk Harald Gebhard Basics Program Object based Internet Broadcast - Introduction - Internet Protocols (RTP, SDP) - System First implementation (Virtual Internet Radio) Further Work Overview 1

de Basics Program Object based Internet Broadcast - Introduction - Internet

2 progressive Download Download Streaming Media on Demand Live Video/ receiving decoding rendering packet 3 packet 2 packet 1 time IP Streaming 2

3 Network Unicast Network IP Multicast 3

4 Multimedia Object Media Object video audio subtitle t distributed content personal program streaming / download using bandwidth economic multicast technologies Program Object Streaming IP Multicast telecommuting listener radio / business TV narrow casting stream ad insertion Distributed Content 4

technologies Program Object Streaming IP Multicast telecommuting listener

5 Content Providers store content on servers Content Managers combine distributed content to a program Network Providers transmit the content to the receivers Object based Broadcast System Distributed Multicast Personal Program (1) 5

Providers transmit the content to the receivers Object

6 example M = 3 [music, news, ads] N = 44 [punk, industrial, rock ] 1 k = N = 20 [world, business, sports, ] 2 k =0.1 2 N 3= 10 [local ads] k 3 =0.07 B = 0.83* * *10 40 streams music C = 44 *20 *10 = news 8800 ads virtual channels Personal Program (2) Real-Time Transport Protocol (RTP) Session Description Protocol (SDP) (Real-Time Streaming Protocol (RTSP)) IP Multicast Standard Internet Protocols 6

7 Type P Extension MPB Sending Time MCSI MCC P-MCSI P-MCC MCIT as CNAME in SDES audio-video synchronisation MCIT for sequence control arranging Chunk Streams MCIT for predownloads sending time, content type, maximum play back Multimedia Chunk ID Tag (RTP) session name and purpose expected duration of session payload types offered in this session information needed to receive and decode the media data (addresses, ports, local file name, formats etc.) sequence control m=audio RTP/AVP 0 c=in IP /15 a=mcit: * * a=mcit: * * Media name, port 49230, payload type Connection information / TTL Music Multimedia Chunk ID Tag DJ Multimedia Chunk ID Tag Session Description Protocol (SDP) 7

information needed to receive and decode the media data (addresses, ports, local file name, formats etc.) sequence control m=audio 49230 RTP/AVP 0 c=in IP4 239.155.65.

8 System Program manager, Playlist editor, Scheduler - Java,Java Applets Content Server, Control Unit - Apache HTTP server 1.3 (Linux), MySQL - Common Gateway Interface (CGI), PHP, Java - Streaming Unit, C - 128kbit MP3 Receiver - C implementation Virtual Radio Station 8

3 (Linux), MySQL - Common Gateway Interface (CGI), PHP, Java -

9 Program Manager Web page 9

10 Playlist Editor (DJ) open connection SDP open connection Multicast adress RTP Data Compare SSRC to SSRCs in List write Data to buffer RTCP Parse RTCP (SR/SDES) List of SSRCs SSRC1 SSRC2. SSRCn Compare CNAME to CNAMEs in SDP add SSRC to list create new buffer Multicast adress RTP Data RTCP (Disk-)buffer SSRC1 (Disk-) buffer SSRC2 (Disk-) buffer SSRCn Modify TS/SEQ Player Receiver (1) 10

SSRCn Compare CNAME to CNAMEs in SDP add SSRC to list create new buffer Multicast adress RTP

11 (music / sport news) (music / world news) Receiver (2) Performance Test Conditions: different IP Multicast configurations LAN, university network PIM-SM Results: system performed in a very robust way continual audio flow (time shifting) video / audio Empirical Results 11

university network PIM-SM Results: system performed in a very

(xdsl, dial-access) Pilot Project ( Hörer Radio ) RTL NEWMEDIA, MediaWays, GEMA Work in

12 Transport Two Step Approach: - Error Concealment (always) - Reliable Multicast Extension (if possible) Scheduler Optimising Algorithms - Server Bandwidth (DVB-S, DVB-T) - Client Bandwidth (xdsl, dial-access) Pilot Project ( Hörer Radio ) RTL NEWMEDIA, MediaWays, GEMA Work in Progress Satellite Set-Top-Box Mobile Internet CATV/HFC IP Network ADSL Lan Anywhere and at Any Time 12

13 Streaming, IP Multicast Program Object based Internet Broadcasting Standard Internet Protocols Pure Software Solution Easy integration as a plug-in into commercial Software Player Applications Two Step Approach Error Handling Scheduler Optimising Anywhere and at Any Time Summary Recent references on our work: Gebhard, H., Lindner, L., Virtual Internet Broadcasting, IEEE Communications Magazine, Vol.39 No.6, 2001 Gebhard, H., Kays, R.: Virtueller Rundfunk über das Internet, FKT, , pp , 2001 Gebhard, H., Lindner, L.: Virtual Broadcast - A novel service based on IP Multicast, Protocols for Multimedia Systems 2000, IEEE, Cracow, October 2000 Gebhard, H., Schröder, K.: One-to-One TV over IP-Multicast, Packet Video Workshop 2000, IEEE, Cagliari, May 2000 Harald Gebhard harald.gebhard@uni-dortmund.de 13

, Virtual Internet Broadcasting, IEEE Communications Magazine, Vol.39 No.6, 2001 Gebhard, H., Kays, R.: Virtueller Rundfunk über das Internet, FKT, 1+2 2001, pp. 13-23, 2001 Gebhard, H., Lindner, L.

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