Making real-time video and audio IP systems work with greater efficiency requires an advanced appreciation of timing measurement. This presentation exposes the timing extremities of the bell distribution curve and suggests strategies to improve signal throughput resulting in improved productivity and performance.

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File Type: pdf
Presenters : Tony Orme - Broadcast Bridge
Year : 2019
dlp_document_download : AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 1 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 C U R A T E D B Y Timing Tails & Buffers Tony Orme Editor, at The Broadcast Bridge Your Logo Here (see note on Slide 3) I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 SMPTE 2110 • SMPTE have abstracted away the video, audio, and metadata essence from the underlying hardware • No longer will we be dependent on point to point dedicated connections • No longer will we be constrained by fixed non -scalable hardware systems 2 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 2 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 REMI ( REMote Integration) – OB’s 3 Your Logo Here I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 Television Demands Continuity 4 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 3 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 5 Your Logo Here Input and Output must be synchronous I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 What Happens When the Input and Output is Not Synchronous? 6 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 4 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 7 Your Logo Here • Broadcasting uses dedicated, synchronous point -to -point connections • UDP – fire and forget with no error control • TCP – windowed error correction delivery IP Protocols vs Broadcast I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 8 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 5 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 9 Your Logo Here Packet Delivery I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 10 Your Logo Here Understanding IP Imagine sitting on the back of an IP datagram as it traverses through a network and consider what happens next as you move from device to device and network to network AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 6 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 11 Your Logo Here IP Packet Journey • Congestion • Jitter • Re -ordering • Bursting I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 12 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 7 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 13 Your Logo Here I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 14 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 8 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 15 Your Logo Here I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 16 Your Logo Here Is this realistic? AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 9 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 17 Your Logo Here What Problem Do Buffers Solve? I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 18 Your Logo Here What Problem Do Buffers Solve? Synchronize Asynchronous Events AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 10 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 19 Your Logo Here Software Processing Buffers by Design I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 20 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 11 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 21 Your Logo Here I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 22 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 12 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 23 Your Logo Here • In the short term, input rate and output rate differ • In the long term, input and output rates must be the same otherwise overflow or underflow will occur • Determining what is meant by short and long term is a skill broadcast engineers will learn as we continue our IP journey I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 24 Your Logo Here Unintended Consequences Beware of TCP/IP AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 13 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 25 Your Logo Here I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 26 Your Logo Here TCP/IP Large errors can result in many resends, this gives the impression of a high bit rate, but the data throughput is greatly reduced, leading to high latency. AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 14 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 27 Your Logo Here I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 Conclusion • Buffers are a necessary part of IP life • IP networks are " bursty " by design • Understanding the interaction between latency and buffers is essential • We can work with buffers • Zero latency does not exist 28 Your Logo Here AIMS IP Showcase IBC 2019 September 2019 Curated by Video Services Forum vsf.tv 15 I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 Further Reading at The Broadcast Bridge • Essential Guide – Software COTS for Real Time Broadcast ‒ case study from TAG Video Solutions • Essential Guide – Hybrid IP and SDI Test and Measurement ‒ case study from Leader • Essential Guide – Secure IP Infrastructures ‒ case study from HPE OEM • Essential Guide – IP Explored ST2110 and ST2022 ‒ case study from TSL Professional Products 29 Your Logo Here I P S H O W C A S E T H E AT R E AT I B C 2 0 1 9 : 1 3 –1 7 S E P T 2 0 1 9 Thank you 30 Your Logo Here Tony Orme, The Broadcast Bridge tony.orme@TheBroadcastBridge.com +44 (0) 7845 011 435
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