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This session give network managers an insight into the impact of HD surveillance video running over existing voice and data networks. It will cover how OoS can be maintained an ally any fears on the impact of network performance and user impact.
Citation preview
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: [email protected]