Can HD video run over one converged network
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Transcript of Can HD video run over one converged network
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Can HD run over oneconverged network?
October 2010
Les LitwinSales Director
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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
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Raw Video Data Rates
M Bits/second
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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
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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
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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)
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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
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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
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DEMO Showing quality versus data rate
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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
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Multicast for large numbers of viewers
Regardless of number of viewersserver sends only one stream
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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
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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
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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
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Typical HD Video + Virtual Desktop Solution
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Video over IP Options
IP Network
NETWORK VIDEO AUDIO
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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
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Contact
• Les Litwin - Technical Sales Director
8 Hasting CloseBrayBerksUnited KingdomSL6 2DA
• Telephone: +44 (0)1628 626098Fax: +44 (0) 1628 681566Email: [email protected]