EBU TECHNICAL. Audio over IP. Mathias Coinchon. European Broadcasting Union
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1 EBU TECHNICAL Audio over IP WBU-ISOG Geneva 30 th November 2009 Mathias Coinchon EBU TECHNICAL European Broadcasting Union
2 Audio over IP
3 N/ACIP timeline 2005 ISDN will be phased out from end 2007!! What replacement solution for audio contribution?!
4 N/ACIP timeline ISDN will disappear in 2007!! What solution for audio contribution?! EBU N/ACIP group started. Objective: find replacement solution German broadcasters and manufacturers meeting for Audio over IP First meeting with manufacturers in September (IBC)
5 N/ACIP timeline ISDN will disappear in 2007!! What solution for audio contribution?! EBU N/ACIP group started. Objective: find replacement solution German broadcasters and manufacturers meeting for Audio over IP First meeting with manufacturers at IBC >15 manufacturers Consensus on interoperability EBU TECH3326 standard publication Early implementations ti Tests
6 N/ACIP timeline ISDN will disappear in 2007!! What solution for audio contribution?! EBU N/ACIP group started. Objective: find replacement solution German broadcasters and manufacturers meeting for Audio over IP First meeting with manufacturers at IBC 2 Plug test workshops at IRT with manufacturers EBU TECH 3329 tutorial publication >15 manufacturers Consensus on interoperability EBU TECH3326 standard publication Early implementations Tests
7 N/ACIP timeline ISDN will disappear in 2007!! What solution for audio contribution?! EBU N/ACIP group started. Objective: find replacement solution German broadcasters and manufacturers meeting for Audio over IP First meeting with manufacturers at IBC >15 manufacturers Consensus on interoperability EBU TECH3326 standard publication Early implementations Tests 2 Plug test workshops at IRT with manufacturers EBU TECH 3329 tutorial publication
8 Technical overview Audio coding Audio over IP application A Signaling Audio over IP application B Encapsulation Audio stream / Packets Audio stream / Packets RTP RTP Transport protocol TCP UDP IP NC UDP TCP IP NC CODEC IP network NETWORK In red: standardized elements in EBU TECH3326
9 Audio coding Minimum set of codecs for compatibility A: Mandatory codecs (A minimum set, always to be found) G.711 G.722 MPEG-1/2 Layer II PCM 16 bits, 20 bits, 24 bits B: Recommended codecs MPEG-4 AAC, MPEG-4 AAC-LD MPEG-1/2 Layer III C: Optional codecs Enhanced APT-X, MPEG-4 HE-AACv2, Dolby AC-3...
10 EBU TECH 3326 specification Transport protocols RTP: Realtime Transfer Protocol on top of User Datagram Protocol (UDP) TCP (Transmission Control Protocol) is optional RTP media payload formats according to IETF RFC specifications IETF: Internet t Engineering i Task Force Signalling protocols SDP : Session Description Protocol (RFC4566) SIP : Session Initiation Protocol (RFC3261) SAP : Session Announcement Protocol (RFC2974) Offer/Answer model for SDP (RFC3264) for codec negotiation => Compatibility with Voice over IP systems based on SIP
11 SIP interoperability 3G + Wi-Fi VoIP Phone IP NETW Firewall Studio-side AoIP Codec Reporter s AoIP Codec SIP Proxy and Registrar Server SIP servers associate names with IP addresses and allow a reporter* to be found, whatever the location, whatever the device! *e.g. - sip:reportername@sr.se or telephone number
12 2 nd plugtest workshop IRT - May participating manufacturers AEQ, AETA, APT, AVT, Digigram, i Mandozzi, Mayah, Ob Orban, Prodys, Telos, Tieline Late/withdrawn: Technica del arte, Comrex Organisation: 55 sessions of 1.5 hours: 82.5 hours (cumulated) of testing 6 measurement tables Wireshark captures (free/open packet sniffing software) Tests: All connection through SIP proxy/registar (provided by WDR) Codecs tested: G.711, G.722, MPEG LII 256kbps 48kHz stereo, PCM 20 bits 48kHz stereo, MPEG-4 AAC-LC 160kbps, MPEG-4 AAC-LD 160kbps
13 Plugtest Network
14 Wireshark packet capture
15 Wireshark SIP analysis
16 Plugtest II
17 Plugtest II
18 Results, main issues SIP signalling Ambiguous messages Incompatibilies with SIP Proxy (Open SER). No SIP proxy reference exists. SDP signalling Wrong parameters signalling AAC: complex syntax with references to MPEG standards RTP encapsulation PCM: big endian/little endian AAC: many uses LATM, ADTS or LOAS but raw AAC is specified
19 Audio contribution over IP devices Software codecs Reporter codecs Studio, OBVan Codecs
20 Networks IP INTERNET No real IP network equivalent to ISDN nowadays ISDN: public international ti network with Quality of Service Internet as the only international public IP network No Quality of Service Private IP network solution get widespread Big telecom operators Inmarsat or DVB-RCS providers Eurovision development of DVB-RCS solution
21 Conclusion on ACIP EBU TECH 3326 implementation soon reaches maturity Clarifications needed. d 4 th revision i TECH3326 in preparation. Almost all manufacturers are compatible with mandatory audio coding First AAC interoperability IMPORTANT: ASK FOR INTEROPERABILITY TO THE MANUFACTURERS REMAINING ISSUE: NEED FOR AN INTERNATIONAL IP NETWORK WITH QoS
22 Other EBU activities on networks
23 Other NMC project groups N/VCIP: Video contribution over IP Chair: Markus Berg (IRT) Current work: MXF over IP specification Liaison with Video Services Forum (VSF, US organisation) for uncompressed transport, etc N/I3P: Intercom Interoperability over IP Chair: Claire Mérienne (France 3) Current work: specification for intercom (based ACIP spec.) First meeting with manufacturers during IBC 2009 N/IPM: IP networks measurement and profiling Chair: Yuan-Xing Zheng (BBC R&D) N/CNCS : Common Network Control Strategy Chair: Chris Chambers (BBC R&D)
24 N/I3P: Intercom Interoperability over IP N/I3P: Intercom interoperability over IP TV Intercom ( 4 wires ) Presenter return channel Subset of TECH3326 done for N/ACIP SIP signalling (like Voice over IP systems) RTP transport Audio voice codecs: G.711, G.722, Speex (free, open source) First meeting with manufacturers during IBC Draft in preparation
25 EBU N/VCIP profiles Profile 1: Uncompressed (SD, HD) over IP Studio and Inter-studio t environments Profile 2: MPEG TS over IP Inter-studio, sports, news Profile 3: MXF streaming over IP Studio, Inter-studio (JPEG2000 and other production formats) Profile 4: Low bitrate News, small offices
26 EBU TECHNICAL Thank you Questions?
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