What is Video Streaming? | LongTail Video | Home of the JW Player - 1 views
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codecs videodelivery onlinevideo streaming progressivedownload adaptivebittrate
shared by Alex Street on 02 Apr 12
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video delivery mechanisms
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three widely used ways
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Progressive Download, RTMP/RTSP Streaming, and Adaptive HTTP Streaming
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Progressive Download is the most widely used
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easiest to implement
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Progressive Download is supported by Flash, HTML5 browsers
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bandwidth is wasted on data downloaded but not watched
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simplicity of Progressive Download also has its downsides.
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inability to change the quality of the video mid-stream
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For longer videos, the downsides start to impact playback too much
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Progressive Download works fine for short clips (a few minutes).
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RTSP/RTMP Streaming
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RTMP/RTSP Streaming is widely used by professional media organizations like Hulu
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only deliver the frames of a video the user is currently watchin
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most widely solution is used is RTMP (Real Time Messaging Protocol)
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HTML5 does not include a dedicated streaming protocol, nor does the iPad/iPhone
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RTMP streaming can change video quality mid-stream
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allows for optimal playback quality in the fullscreen and WiFi/3G scenarios
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if the connection speed drops below the minimum bandwidth needed for the video, playback will be continuously interrupted.
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has specific server and protocol requirements, which makes it less accessible and adds significant complexity and cost
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Adaptive HTTP Streaming is a fairly new streaming format
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Adaptive HTTP Streaming works by storing your videos on the server in small fragment
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daptive HTTP Streaming leverages standard webservers, it is supported by webhosters and CDNs alike.
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none of the Adaptive HTTP Streaming implementations work with regular MP4 files.
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Adaptive HTTP Streaming will likely become the single video streaming method over time
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live streaming is not possible,
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o data is downloaded in advance and data a user has seen is immediately discarded.