AES67 and ST 2110-30 Interoperability in Real Life

Presenters : Claudio Becker-Foss - DirectOut

Year : 2019

dlp_document_download : C U R A T E D B Y I P S H O W C A S E T H E AT E R AT N A B – A P R I L 8 -11 , 2 01 9 AES67 and ST2110 - 30 Interoperability in Real Life Claudio Becker -Foss, CTO / CEO DirectOut GmbH What this session is about • Brief introduction of AES67 and ST2110 • Closer look into AES67 mandatory and extended features • What information do I need to configure my streams • Tools for Stream Setup • Tools for Troubleshooting • AES67 and Dante 2 AES67 AES67 -2018 Standard for Audio Applications of Networks: High -performance Streaming Audio -over -IP Interoperability • Goal: Find a common ground to exchange audio (media ) between devices of different brands with proprietary IP implementations • Out of Scope : discovery and connection management 3 SMPTE ST2110 Professional Media Over Managed IP Networks Suite • -10 – System Timing and Synchronisation • -20 / -21 – Video • -30 / -31 – Audio • -40 – Ancillary Data • … 4 ST2110 - 30 • Audio Transport over IP • Synchronised with Video via PTPv2 • Refers to AES67 -2018 as format to transmit PCM audio • A few constraints apply ‒ See AIMS Whitepaper „AES67 / ST 2110 Commonalities and Constraints " https://www.aimsalliance.org/white -papers/ 5 AES67 Recap • What does the standard mandate ? • What has been implemented ? 6 AES67 – What is mandatory ? • Samplerate: 48kHz • Packet time: 1ms • PTP v2 Synchronisation • IGMP v2 (v3 for ST2110) • QoS DSCP Markings ‒ Clock: EF ‒ Media: AF41 ‒ Anything else : DF (Best Effort ) • Audio Encoding: 16 and 24 Bit • Channel Count: 1 -8 Channels per stream • Multicast and Unicast • SDP • SIP ( Unicast ) 7 AES67 – What else is possible? • Samplerates: 96 kHz, 44.1 kHz • Packet times : 125µs, 250µs, 333µs, 4ms • More than 8 audio channels per stream (e.g. 64ch) • IGMP v3 ( automatic fall -back to v2) • Discovery (RTSP, Bonjour , SAP) not scope of the standard but can be added on top of AES67 8 9 Format, sampling rate Packet time Maximum channels per stream L24, 48kHz 125 microseconds 80 L16, 48kHz 250 microseconds 60 L24, 48kHz 250 microseconds 40 L24, 48kHz 333 -1/3 microseconds 30 L24, 96kHz 250 microseconds 20 L24, 48kHz 1 millisecond 10 L24, 48kHz 4 milliseconds 2 10 Format, sampling rate Packet time Maximum channels per stream L24, 48kHz 125 microseconds 80 L16, 48kHz 250 microseconds 60 L24, 48kHz 250 microseconds 40 L24, 48kHz 333 -1/3 microseconds 30 L24, 96kHz 250 microseconds 20 L24, 48kHz 1 millisecond 10 L24, 48kHz 4 milliseconds 2 AES67 – What do I need to set up a stream? v=0 o= - 1 2832056294 IN IP4 192.168.1.210 s=AES67 1 t=0 0 m= audio 5004 RTP/AVP 97 i=Stream 1 c=IN IP4 239.69.0.1/128 a=rtpmap:97 L24/48000/8 a=sync -time:0 a=clock -domain:PTPv2 0 a=framecount:48 a= recvonly a= mediaclk:direct =0 a= ts -refclk:ptp =IEEE1588 -2008:00 -1D -C1 -FF -FE -0E -67 -16:0 a=ptime:1 a=maxptime:1 11 AES67 – What do I need to set up a stream? v=0 o= - 1 2832056294 IN IP4 192.168.1.210 s=AES67 1 t=0 0 m= audio 5004 RTP/AVP 97 i=Stream 1 c=IN IP4 239.69.0.1/128 a=rtpmap:97 L24/48000/8 a=sync -time:0 a=clock -domain:PTPv2 0 a=framecount:48 a= recvonly a= mediaclk:direct =0 a= ts -refclk:ptp =IEEE1588 -2008:00 -1D -C1 -FF -FE -0E -67 -16:0 a=ptime:1 a=maxptime:1 12 • Multicast IP: 239.69.0.1 • Destination Port: 5004 • Encoding: L24 (24 Bit) • Samplerate: 48000 (48kHz) • Channel Count: 8 • Payload ID: 97 • Packet time: 48 AES67 – How do I get the SDP into my device ? • Manually • RTSP (e.g. RAVENNA) • SAP (e.g. Dante) ‒ Dante Controller does not provide means to manually enter stream information • NMOS 13 RAV2SAP 14 RAV2SAP – SDP view 15 Troubleshooting – What , if it does not work ? • Check stream configuration ‒ Is it really AES67 compliant ? ‒ If it is different from the mandatory set , does the device support it ? • Check Multicast IP • Check Destination Port • Check Payload ID • Check Stream Delay • If it still doesn‘t work -> Wireshark! 16 17 PTP Troubleshooting 18 www.ptptrackhound.com AES67 and Dante • Multicast only (no Unicast ) • Restricted Multicast IP -Range: 239.p.x.x Default Prefix : 239. 69 .x.x • Encoding: L24 (24 Bit) • Packet time: 1ms TX / 1ms, 125µs, 250µs, 333µs RX • Non -Standard DSCP Markings • Dante Redundancy mode not available 19 Implementation dependent peculiarities and pitfalls • SDP Distribution • Multicast Prefix • Dynamic Payload IDs • DSCP Markings for QoS 20 Standard Clock: EF Media: AF41 Dante AES67 Clock: CS7 Media: EF JT - NM Tested • Program initiated by JT -NM, EBU and IRT • To give documented insight into how vendor equipment aligns to ST2110 • Check out the JT -NM Tested Program on www.jt -nm.org and on the Show Floor 21 C U R A T E D B Y I P S H O W C A S E T H E AT E R AT N A B – A P R I L 8 -11 , 2 01 9 Thank You Claudio Becker -Foss, DirectOut GmbH aes67@directout.eu www.directout.eu