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Alex Street

What is Video Streaming? | LongTail Video | Home of the JW Player - 1 views

www.longtailvideo.com/...what-is-video-streaming

codecs videodelivery onlinevideo streaming progressivedownload adaptivebittrate

shared by Alex Street on 02 Apr 12 - No Cached
  • video delivery mechanisms
  • three widely used ways
  • Progressive Download, RTMP/RTSP Streaming, and Adaptive HTTP Streaming
  • ...24 more annotations...
  • Progressive Download is the most widely used
  • easiest to implement
  • Progressive Download is supported by Flash, HTML5 browsers
  • bandwidth is wasted on data downloaded but not watched
  • simplicity of Progressive Download also has its downsides.
  • inability to change the quality of the video mid-stream
  • For longer videos, the downsides start to impact playback too much
  • Progressive Download works fine for short clips (a few minutes).
  • RTSP/RTMP Streaming
  • RTMP/RTSP Streaming is widely used by professional media organizations like Hulu
  • only deliver the frames of a video the user is currently watchin
  • most widely solution is used is RTMP (Real Time Messaging Protocol)
  • HTML5 does not include a dedicated streaming protocol, nor does the iPad/iPhone
  • RTMP streaming can change video quality mid-stream
  • allows for optimal playback quality in the fullscreen and WiFi/3G scenarios
  • if the connection speed drops below the minimum bandwidth needed for the video, playback will be continuously interrupted.
  • has specific server and protocol requirements, which makes it less accessible and adds significant complexity and cost
  • Adaptive HTTP Streaming is a fairly new streaming format
  • Adaptive HTTP Streaming works by storing your videos on the server in small fragment
  • daptive HTTP Streaming leverages standard webservers, it is supported by webhosters and CDNs alike.
  • none of the Adaptive HTTP Streaming implementations work with regular MP4 files.
  • Adaptive HTTP Streaming will likely become the single video streaming method over time
  • live streaming is not possible,
  • o data is downloaded in advance and data a user has seen is immediately discarded.
David Astle

NPIA: Police National Network - 0 views

www.npia.police.uk/10511.htm

Police UK PNN3 Communication MPS Network

shared by David Astle on 25 Jan 12 - No Cached
  • David Astle on 25 Jan 12
     
    Who is responsible? DCC Readhead is the current Senior Responsible Officer. The PNN User Committee (PUC), ACPO Information Technology User Group (ITAG), SPSA and National IT Projects were consulted on PNN3 requirements.
David Astle

MPA: Police officer, staff and PCSO numbers - 0 views

www.mpa.gov.uk/...police-numbers

Statistics MPS London Police PoliceOfficer

shared by David Astle on 31 Jan 12 - No Cached
  • David Astle on 31 Jan 12
     
    etropolitan Special Constables (MSC
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