MACROMEDIA FLASH MEDIA SERVER 2-CLIENT-SIDE ACTIONSCRIPT LANGUAGE REFERENCE FOR FLASH MEDIA SERVER 2 Manual de usuario descargar pdf (Pagina 130)

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SERVER-SIDE ACTIONSCRIPT LANGUAGE REFERENCE FOR ADOBE MEDIA SERVER 5.0.1

Server-Side ActionScript Language Reference

Last updated 7/2/2013

ProxyStream class

Use the ProxyStream class to build large-scale applications that use DVR functionality. DVR functionality lets users

pause live video and resume playback from the paused location. Users can rewind and play recorded sections of the

video and seek forward to catch up again.

To scale applications, use server-side NetConnection objects to create a chain of servers. In such a scenario, all the

servers run as local servers. To explain this scenario, the ingest servers at the top layer are called origin servers, servers

in the middle layer are called intermediate servers, and the servers on the bottom layer (which serve subscribers) are

called edge servers.

Note: The terms “origin” and “edge” in this scenario do not refer to local and remote operation (see the Proxy section of

the Vhost.xml configuration file). All servers in this scenario run in local mode.

Only the server controlled by the publisher records streams. Servers further down the chain, closer to subscribers, do

not record the stream and do not have the stream available for playback. If a recorded stream does not exist on a server,

subscribers cannot access it. Use the ProxyStream class to pull segments of recorded streams from another server

where the segments are available. Call

ProxyStream.proxyFrom() to line up an intermediate server with an origin

server. When a recorded stream is requested in the intermediate server, it automatically pulls the required segment

down from the origin server. The segment is stored in the memory cache of the intermediate server just as segments

are stored in the origin server. Every subscriber going through the intermediate server gets the data directly from the

cache so that segments can be shared across multiple clients. Set up an edge server to pull data from an intermediate

server, which pulls data from the origin server when necessary. It’s a good idea to code your application so that when

streams are idle they failover to a different source.

No disk usage is required in the intermediate and edge server. File segments that have been pulled from another server

are stored in the memory cache. The server uses an LRU (Least Recently Used) scheme to maintain the cache. The

server pushes older segments out of the cache when the memory reaches a value that you can configure. To save

bandwidth and improve performance, the server can also save segments in the memory on disk. You can configure

the location of the cache directory, and the maximum size of the cache.

Availability

Flash Media Server 3.5

Method summary

Event handler summary

ProxyStream constructor

new ProxyStream(connection)

Creates an instance of the ProxyStream class.

Method Description

ProxyStream.proxyFrom() Proxies a stream from one Adobe Media Server to another over a NetConnection.

ProxyStream.stop() Stops proxying a stream.

Event handler Description

ProxyStream.onStatus() Called every time a status change or error occurs in a ProxyStream object.

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MACROMEDIA FLASH MEDIA SERVER 2-CLIENT-SIDE ACTIONSCRIPT LANGUAGE REFERENCE FOR FLASH MEDIA SERVER 2 Manual de usuario Pagina 130