Ideas on Video Communications [Video]

Error correction techniques for IP networks

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IP network transmission errors are characterized by one or more consecutive IP packets lost during transmission. Some networks frequently drop single packets, while some networks are more prone to the infrequent loss of long bursts of consecutive IP packets [burst errors]. Poor performing networks may exhibit both error types.

Error correction methods:

There are few methods normally used to correct for lost IP packets.

1. ARQ (Automatic Retransmission reQuest) involves the two-way communication between the transmitter and receiver to enable the re-transmission of lost IP packets.

2. FEC (Forward Error Correction) is the transmission of enough additional redundant information with the primary data stream to reconstruct lost IP packets up to a certain extent.

3. A third method is a hybrid of the above ARQ and FEC techniques. All the methods mentioned require additional bandwidth and transmission time (latency) to compensate for the lost IP packets.

ARQ Characteristics:

ARQ technology monitors whether or not the receiver obtains all IP packets. If a packet is not obtained after a certain amount of time elapses, the receiver will transmit a retransmission request to the transmitter to resend the lost packet. If more packets are lost, more retransmission requests are sent.

Details of ARQ are as follows:

1. In practice, the ARQ bandwidth must be capped on a network with limited bandwidth. Theoretically, the ARQ could disrupt the transmission by transmitting too much data, causing newer packets to drop due to limited bandwidth, thus creating a snowball effect.

2. ARQ needs time to make sure a packet is lost rather than simply out of order. This means that the receiver must buffer the data while the ARQ determines whether a packet is lost and request the lost IP packet from the transmitter. This will increase the overall transmission latency significantly (multiple times the original transmission delay).

3. ARQ requires a two way transmission link to work.

4. ARQ does not support multi-cast transmission. It only works on a point-to-point connection.

5. ARQ often has problems passing through “Firewalls”.

6. ARQ requires little to no overhead if no transmission errors are detected.

FEC Characteristics:

FEC technology transmits a fixed overhead of redundant information enabling the receiver to reconstruct a number missing IP packets. The FEC transmitter generates “Check sum” IP packets for a number of IP packets. Allowing the transmitter to transmit more overhead (FEC packets) allows for correction of more network errors. The FEC transmitter also “interleaves” IP packets in order to enable the correction of consecutive lost IP packets (burst errors). The packet interleaving and check sum generation process generates latency in the transmitter and receiver.

Details of FEC are as follows:

1. FEC’s transmitting more overhead (FEC packets) can correct more network errors.

2. FEC’s need IP packet interleaving to correct for consecutive lost IP packets.

3. The more IP packets which are interleaved the longer burst packet losses can be recovered by the FEC, but the latency is proportional with the number of interleaved packets.

4. The interleaving method (Matrix shape, number of Columns and rows) determinates the FEC’s error correcting capabilities for burst errors and single packet losses.

5. The FEC latency and overhead for a given matrix size is constant at all times.

Combined ARQ and FEC error correction approaches Some implementations employ both ARQ and FEC technologies. Generally speaking these implementations are using the FEC to correct for transmission errors most of the time. Only when the FEC’s error correction capability is exhausted does the ARQ start to re-transmit lost IP packets. More intelligent implementations using an ARQ and FEC Hybrid will reduce the FEC overhead when the ARQ is activated enabling the ARQ to use just the remaining bandwidth keeping the total consumed bandwidth constantly provisioned for the service. Figure 1 below shows an example of an FEC + ARQ hybrid error correcting system. The left block shows a 10 x 10 IP packet data block (dark grey) and includes 20 FEC overhead packets (10 FEC Row check sums and 10 Column check sums). The dark purple colored blocks symbolize lost IP Data packets recovered by the FEC. The 10 x 10 FEC can correct burst errors up to 10 consecutive missing IP packets plus a few single random missing IP packets. The light purple colored packets are missing IP packets which cannot be corrected by the 10 x 10 FEC and are instead corrected by the ARQ.

Learn more here: http://vidovation.com/iptv-video-netw...

Healthcare facilities have much to gain by implementing a video networking and Healthcare & Hospital IPTV system. Discover how you can increase your revenue per available room, reduce 30 Day readmission rates, improved patient satisfaction, and HCAHPS scores enhance your branding and obtain better operational efficiency. All through the ability to deliver live TV & Video on Demand to your patients and guests. Additionally, train staff and maintain compliance with education video distribution.

See how we did 60GHz wireless video for the NHL!

http://vidovation.com/bridging-the-gap

The FCC recently modified its Part 15 rules governing unlicensed communication equipment in the 57GHz-64GHz band (known as the 60GHz band) opening the way for enhanced use of the unlicensed spectrum. With its 7GHz of bandwidth, this band now promises to provide wireless broadband network connectivity over distances of up to one kilometer at data rates up to 10 Gb/s. This enables low cost, point-to-point wireless contribution of uncompressed 4K video and high bandwidth IP data. Broadcasters, sports leagues, news bureaus, government agencies and the military will have a short-range, back-haul wireless link connecting uncompressed 4K video and up to 10Gb/s data to the broadband video and IP networks. This paper will discuss the theoretical and commercial implementation challenges and advantages of 60GHz systems vs. 2-5GHz /70/80/90GHz systems. We will discuss and compare quadrature amplitude modulation (QAM) and phase shift keying (PSK). We will compare horn antennas and parabolic dish antennas for different applications. We will outline a practical implementation of a custom-built 60GHz wireless camera system for the National Hockey League and a 700 meter uncompressed wireless link for the National Football League. Learn how 60GHz is stealthy for military applications.

http://vidovation.com/blog/nab-2017-p...

VidOvation — Moving Video Forward — is a leading provider of video, audio, and data transmission and distribution systems for the broadcast television and sports, corporate AV, and government markets, offering 50 years of combined experience. Encompassing bonded cellular, wireless video, video streaming, video networking, encoding, IPTV, and fiber optic communications systems, VidOvation solutions improve video transmissions by removing the frustrations of dropouts, latency, interference, noise, and security issues. VidOvation excels in helping its clients integrate custom solutions into existing infrastructure, with the ability to meet almost any application or budget. The company applies proven expertise on the complete project life cycle — from project consulting and management to engineering and design, to warranty and support.

“At the 2017 NAB Show Las Vegas, we will be showing our latest wireless, cellular, fiber optic and IP technologies that make field video acquisition, contribution, and distribution faster while enabling lower latency and higher video quality than ever before. See the Haivision bonded cellular technology that made the new A&E live reality cop show ‘Live PD’ possible. Learn more about our IPTV projects at Viacom and Nickelodeon where we distribute live DirecTV and studio feeds to TVs, video walls and desktops.”

Vidovation EVP of Engineering & CTO Jim Jachetta and Haivision Area Sales Manager Florian Kolmer discuss the highlights on the booth at NAB Show New York with InBroadcast's Vanessa Rae.

VidOwave 60G 750 PA Gigabit Wireless Ethernet Link http://vidovation.com/Transport/Wirel...

The VidOwave 60G 750 PA is an advanced 60 GHz millimeter-wave broadband and wireless data connectivity solution that delivers low latency and full-duplex Gigabit Ethernet transport speeds in a small ruggedized, easy-to-install enclosure. Typical deployments include line-of-sight data links that would otherwise be impossible or cost-prohibitive with fiber optic cable for such applications as IP video streaming and transport, connecting LANs between buildings, extending fiber backbones, and wireless backhaul for 3G and 4G/LTE mobile networks.

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Photo Caption: VidOwave 60G 750 PA

DirecTV Integration With VidOvation TV and Digital Rights Management http://vidovation.com/iptv-video-netw... VidOvation TV, a turnkey enterprise IPTV system, now includes full integration of DirecTV content. The integration enables an end-to-end IPTV system that includes DirecTV, digital rights management, video on demand, and digital video recording with streaming to smartphones, tablets, desktop players, displays, smart TVs, and set-top boxes.

Haivision DMNG Family of Solutions for Live Video Over Bonded Cellular http://vidovation.com/Haivision-bonded-...

As master distributor for Haivision in the U.S. market, VidOvation will showcase the two newest products in Haivision’s DMNG family of bonded cellular video transmission solutions for newsgathering applications. Offering the industry’s highest processing power for bonded cellular transmissions with bit rates of up to 20 Mbps, the DMNG Pro includes a second high-bit-rate encoding engine for high-resolution video recording. New support for dynamic latency and adaptive bit-rate functionality enable the DMNG Pro to minimize latency and seamlessly adjust to changing network conditions without operator intervention. In addition, the DMNG Pro now supports the bonding of eight cellular modems into an Internet access point to help news crews cut costs while maximizing bandwidth and efficiency.

VidOvation is also highlighting the DMNG HE4000, an HEVC/H.265 4K video encoder for contribution and primary distribution. With support for high-efficiency video coding (HEVC), the DMNG delivers the same video quality as H.264/AVC at 50 percent of the required bandwidth, optimizing the distribution of SD, HD, and 4K content over unmanaged networks such as the public internet. By combining HEVC encoding and Haivision’s SafeStreams® contribution technology, the DMNG HE4000 reduces bandwidth costs dramatically while guaranteeing superior video quality.

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Photo Caption: Haivision DMNG PRO 180 RA VidOlink Long-Range Wireless Transmission Systems http://vidovation.com/wireless-hd-sdi...

At the 2016 NAB Show New York, VidOvation will launch two new wireless transmission systems: the VidOlink Ranger2 and the VidOlink Tally & Control. The VidOlink Ranger2 is a lower-cost long-range transmission system that can transmit wireless HD video as far as 2 miles with line-of-sight on the 5.8 GHz band. The VidOlink Tally & Control is a complementary means of adding tally and camera control unit (CCU) functionality to new or existing wireless camera systems. Using the 403-473 MHz band, the Tally & Control can transmit a wide range of tally and CCU functions. It can also send data via VidOlink’s RF-over-fiber SMPTE units, delivering RF, data, and power to the receive point with a single cable.

In addition, VidOvation has expanded its lightweight and low-cost VidOlink Reacher family of long-range transmitters with three new models: the VidOlink Reacher 400, VidOlink Reacher 1000, and VidOlink Reacher 2000. Spanning transmission distances of 400, 1,000, and 2,000 feet, respectively, the systems transmit HD SDI and HDMI video with near-zero latency, making them ideal for action sports shots in which near-zero latency is important.

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Company Quote:

“At the 2016 NAB Show New York, we’ll be showing our latest technologies that make field video acquisition, contribution, and distribution faster while enabling lower latency and higher video quality than ever before. See the Haivision bonded cellular technology that made the new A&E live reality cop show ‘Live PD’ possible.”

— Jim Jachetta, Executive Vice President and Chief Technology Officer, VidOvation

By implementing the best state-of-the art HEVC/H.265 hardware encoder, the AIR320 https://www.vidovation.com/product/aviwes... enables broadcasters and video producers to seamlessly stream live, store and forward high-quality videos with a versatile and truly portable solution.

Thanks to Haivision SafeStreams® technology, the AIR320 detects and bonds together multiple IP network interfaces such as 3G/4G, Wi-Fi, Ethernet, and Satellite connections.

Moreover, the AIR320 adapts the video encoding bitrate according to the real-time network conditions in order to cope with the unpredictable performance of IP networks and to guarantee the transmission reliability.

The units can also be controlled by the transceiver (StreamHub), the Management System (Manager) or any device connected to the unit through the network. The Haivision live IP video contribution system (Manager and/or StreamHub) can operate in a rackmount or cloud-based version.

At InfoComm 2019, VidOvation will demonstrate its Enterprise IPTV video networking system, a turnkey in-house system for flexible, scalable distribution of high-quality video, live television, and digital signage over an enterprise, corporate, or facility network. For added value, VidOvation’s system is one of the few that can also stream digital programming to computer desktops, smartphones, tablets, displays, smart TVs, and set-top boxes. Additionally, users can schedule recordings via a programming guide on their PCs and provide recorded content for on-demand, time-shifted viewing. The VidOvation Enterprise IPTV system is one of the few to support industry-approved digital rights management using either Pro:Idiom or Verimatrix. Through the VidOvation Enterprise IPTV system, businesses or facilities can use internal TV channels to communicate with, train, and guide employees, even issuing appropriate instructions during emergency situations. The system fully integrates with and supports live content from DirecTV, Dish Networks, cable, and more.

For the first time at InfoComm, VidOvation will demonstrate ABonAir’s flagship wireless video link — AB512™. The AB512 system delivers video at a mere seven-millisecond delay without compromising the long-range, high-performance, broadcast-grade transmission quality for which ABonAir is renowned. In addition to offering an extraordinarily low delay, the AB500™ product family includes a proven H.264 codec that was designed explicitly to reduce latency and increase picture quality in wireless video systems. Using codec-wireless optimization, ABonAir increased the wireless range to an incredible 2 miles (3 kilometers). The system features an automatic RF spectrum analyzer that automatically selects and hops to the best RF channel without dropping a single bit, while the manual channel selection option is ideal for frequency coordination. The system also features adaptive modulation and adaptive bit rate based on RF link conditions.

ABonAir’s AB512 wireless video system enables camera teams to wirelessly transmit video directly from cameras to media centers or OB trucks. Built on a bidirectional radio channel between transmitter and receiver, ABonAir’s wireless video links acknowledge the correct acceptance of each group of pixels, thus providing exceptionally robust and reliable transmission. The AB512 supports ABonAir’s Fiber Coverage Extension (FCE), which enables connection of a single receiver to multiple FCE units in various locations within a venue (e.g., horse racetrack, stables, and the winner’s circle) or even at completely separate sites (e.g., football stadium, basketball arena, and swimming pool) — all via fiber cables with unlimited range.

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Photo Caption: ABonAir ultra-low-latency AB512™ wireless video link

Download the White Paper http://vidovation.com/ip-camera-broad...

What's Inside:

Traditional Remote Production IP Remote Production Hardware IP Camera Back Transceiver Typhoon Ingest Card Interfaces and Connections Future Enhancements Synchronous Ethernet IEEE 1588 Video and Audio Network Protocols Genlock and Precision Timing Controls Limitations of IP Distribution RTP Packet Reordering RTP Statistics Monitoring Camera Control and Timecode Succesful Implementations

Here's the Abstract:

Abstract. Extending studio data networks to cameras located anywhere around the globe is the logical endpoint of work currently underway to develop standards for future studios. Not only does this reduce the number of signal formats that need to be supported, but also enables significant cost savings by reducing or eliminating the need to deploy people and equipment to remote venues for live productions. Mobile production and ENG teams can reduce or eliminate their dependency on mobile production trucks. This paper will describe technical details of the Stagebox system developed by BBC R&+D including: Multicamera video and audio synchronization enabled by IEEE 1588 PTP, Video and audio encapsulation, Support for ancillary services including timecode, talkback, tally, and camera control, Direct integration into live workflows, including editing, archiving, and live-to-air production, Deployed directlyDirect Deployment on the Camera -Back with battery power

Visit our site: http://vidovation.com/

Want to find out what technology made it possible for Live PD (now Live PD: Live) to be the top OTT, VOD, and DVR’d show of 2018? Watch the recorded webinar where I’ll give you the inside scoop on the technology behind today’s top live shows.

VidOvation displayed wireless video link from ABonAir who is renowned for providing extremely low latency in a long-range, high-performance, broadcast-grade wireless system with pain and intercom, https://www.vidovation.com/low-latency-wi... ABonAir’s one-of-a-kind solution will benefit VidOvation’s customers in the sports, live events, and newsgathering spaces, where the lowest possible delay is mandatory while preserving high video quality.

https://www.vidovation.com/blog/vidovatio... VidOvation demonstrated Haivision’s HE4000 4K Ultra HD (UHD) HEVC live encoder, which relies on the public internet or bonded cellular to contribute and distribute video, thereby helping to eliminate high satellite costs. Haivision PRO380 Series, the latest generation of Haivision’s highly portable video uplink system is now available to customers in the U.S. and Canada. Packaging a best-in-class H.265/HEVC bonded cellular encoder and transmitter into a compact design, the PRO380 brings powerful bandwidth savings to live remote video production — delivering up to 30 percent savings in cellular data compared with other HEVC solutions on the market and up to 65 percent savings over H.264 uplink solutions. VidOvation IPTV & Digital Signage , a turn-key enterprise IPTV system, now includes full integration of DirecTV content. The integration enables an end-to-end IPTV system that includes DirecTV, digital rights management, video on demand, and digital video recording with streaming to smartphones, tablets, desktop players, displays, smart TVs, and set-top boxes.