Can HD run over oneconverged network?

October 2010

Les LitwinSales Director

Applications for HD over an IP Network

• High quality CCTV surveillance• Door entry video cameras• Streaming video-entertainment• High quality virtual/remote desktop• Hospital MRI CT over IP• Production and process monitoring• Corporate web sites

Raw Video Data Rates

M Bits/second

Video Codecs

• H264 Codec PAL NTSC= 1-2MBits/s (CCTV Quality)

• H264 Codec HD 1080P30 = 2-8 Mbits/s (CCTV Quality)

• Lower data rates can be achieved using reduced frame rates, resolutions, codec tools and other bandwidth efficiency

techniques

H264 Video Codecs

I, P and B frames

• I Frames - Intra Codec (Reference) Frame• P Frames - Predictive (Difference) Frame • B Frames - Bi-Predictive (Pre and Post) • GOP - Group of Pictures

The Basics of Compression

I Frames

P & B Frames

GOP in no of frames

TargetDataRate

Video Data over IP‘H264 data is not smooth and linear’

I frame data typically occupies 40mS-1 frameP frame data varies from 0 to infinity

(typically 2-10 seconds, 50-250 frames)

Methods to manage video data rates

• CBR - Constant Bit rate• VBR - Variable Bit Rate• Frame rate• Resolution• Choice of Codec/compression

CBR = Constant Bit Rate = Average bit rate over timeI frame spikes of data rates above CBR rate.

VBR = Variable Bit rate = less controlled average, P & B frames allowed to vary in data size depending on motion to give better quality

Data Rates- Examples

• Full HD Video fast action full frame rate

- 4-8 Mbits/sec

• SXGA virtual desktop over IP @ 60Hz

- 2-4 Mbits/sec

• Full HD 1080P video with 5 fps VBR Normal

- 800kBits/s to 1.5MBits/sec

• Full HD 1080P video 5 fps CBR=1MBit/sec

- 500kBits/sec -1MBits/sec

DEMO Showing quality versus data rate

Network Management

• Recording or just viewing

• Triggered recording rather than continuous

• Local storage of video rather than centralised

• Simulcast (Pull) V Multicasting (Push/Pull)

• Frame rates - choose based on subject type

• Audio - one or two way

• Numbers of people viewing video streams

Issues that affect network bandwidth

Multicast for large numbers of viewers

Regardless of number of viewersserver sends only one stream

Network Management 2

• Recording high quality stream

• Viewing lower quality secondary stream

• Video storage kept on independent network for CCTV/Video

• Video viewing over general network

• Large numbers of viewers consider multicasting

Main H264 Stream

Secondary stream

RecordingViewing

Dual Streaming

Video Management Software- VMS

• VMS can simultaneously control all IP cameras and servers

• Ability to ‘Propagate to All’ feature to set video data rates on ALL IP cameras/servers

PC Performance for viewing H264 HD Video

• EXAMPLE

• 3 x Full HD 1080P30 streams

• Decoded by one PC

• Requires a good Quad Core Motherboard

• Requires high end graphics card

• Requires 500-1000MBytes of Graphics RAM

Typical HD Video + Virtual Desktop Solution

Video over IP Options

IP Network

NETWORK VIDEO AUDIO

Video codec QoS Summary • 1 x HD Video can use up to 10MBits/s or as little as

50kBits/sec

• Recording - based on events saves bandwidth

• Viewing - using secondary stream lower data rates

• Intelligent VMS software turns off streams when not being viewed

• CBR and VBR choices will affect bandwidth

• Local recording rather than central NVR

• Separate CCTV/NVR network - viewing over entire network

Contact

• Les Litwin - Technical Sales Director

8 Hasting CloseBrayBerksUnited KingdomSL6 2DA

• Telephone: +44 (0)1628 626098Fax: +44 (0) 1628 681566Email: sales@antrica.com