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SMPTE Motion Imaging Journal ( Volume: 124, Issue: 4, May 2015)
[ACTIVE]

Source-Timed SDN Video Switching of Packetized Video

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
SMPTE Mot. Imag J.
Volume
124, No. 4, pp. 56–62
Abstract
The broadcast industry is considering a move from serial digital interface (SDI) infrastructure to a computer-networked infrastructure. Professional media networking will enhance flexibility and agility of the broadcast plant, reduce and simplify cabling, provide for format-agnostic transport, and allow media organizations to benefit from the economies of scale of commercial off-the-shelf (COTS) networking hardware. One key element of video processing is synchronous (“clean”) switching between video sources. The accuracy of the switch point recommended by SMPTE Recommended Practice (RP) 168 is on the order of 10 μs. Unfortunately, the current speed of networking switch flow rule changes using software-defined networking (SDN) is on the order of 1 to 10 ms, and the speed of rule changes is not highly deterministic. To solve this problem, source-timed video switching separates the actions of updating SDN flow rules from the timing of the actual video switch. This technique first adds new SDN flow rules to the networking switch that match a packet header value that is not currently being transmitted. Then, the video source changes its output's packet header value to the new value in the flow rule at the precise RP 168 video switch point. The new packet header value matches the new flow rules; thus, the effect of these two steps achieves precisely timed synchronous video switching (which can be compared with the actions of “preview” and “take” on a video switcher). Fox has developed a proof-of-concept of source-timed video switching using live high-definition SDI sources packetized using SMPTE 2022-6 and synchronously switched on a COTS 10 Gbit/sec Ethernet switch.
Publication Date
2015-05-01
DOI
10.5594/j18550
ISSN
Print: 1545-0279 | Electronic: 2160-2492
Link
https://doi.org/10.5594/j18550
Author(s)
Thomas G. Edwards
bio
Thomas Edwards, Fox Networks Engineering & Operations. Thomas Edwards is vice president, engineering & development at Fox Networks Engineering & Operations, where he has worked on advanced technology projects such as mobile DTV, 3D, and the Fox network satellite distribution system. Before joining Fox in 2007, he was senior manager, interconnection engineering for the PBS Interconnection Replacement Office, where he was responsible for the engineering planning of the PBS Next Generation Interconnection System (NGIS). He has also had significant experience with streaming media production and delivery at the Internet service provider DIGEX and the IP-over-satellite company Cidera. Edwards has contributed to the Report of the SMPTE Task Force on 3D to the Home, the NAB Engineering Handbook, and the SMPTE/EBU/VSF Joint Task Force on Networked Media. He holds a Master's degree in electrical engineering from the University of Maryland, and is a member of IEEE and SMPTE.
Keyword(s)
Video Signal Processing
Copyright
© 2015 Society of Motion Picture and Television Engineers, Inc.

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Thomas G. Edwards; Source-Timed SDN Video Switching of Packetized Video, SMPTE Motion Imaging Journal ( Volume: 124, Issue: 4, May 2015); SMPTE, 2015. Available at https://doi.org/10.5594/j18550
Snippet:
Thomas G. Edwards; Source-Timed SDN Video Switching of Packetized Video, SMPTE Motion Imaging Journal ( Volume: 124, Issue: 4, May 2015); SMPTE, 2015. Available at https://doi.org/10.5594/j18550

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Thomas G. Edwards; Source-Timed SDN Video Switching of Packetized Video, SMPTE Motion Imaging Journal ( Volume: 124, Issue: 4, May 2015); SMPTE, 2015. Available at https://doi.org/10.5594/j18550
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<span class="citation">Thomas G. Edwards; <cite>Source-Timed SDN Video Switching of Packetized Video</cite>, SMPTE Motion Imaging Journal ( Volume: 124, Issue: 4, May 2015); SMPTE, 2015. Available at <a href="https://doi.org/10.5594/j18550" target="_blank" rel="noopener">https://doi.org/10.5594/j18550</a></span>

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Thomas G. Edwards; Source-Timed SDN Video Switching of Packetized Video, SMPTE Motion Imaging Journal ( Volume: 124, Issue: 4, May 2015); SMPTE, 2015
doi: 10.5594/j18550
url: https://doi.org/10.5594/j18550
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Thomas G. Edwards; <cite id="bib-10-5594-j18550">Source-Timed SDN Video Switching of Packetized Video</cite>, SMPTE Motion Imaging Journal ( Volume: 124, Issue: 4, May 2015); SMPTE, 2015
<span class="doi">10.5594/j18550</span>
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