MACROMEDIA FLASH MEDIA SERVER 2-SERVER MANAGEMENT ACTIONSCRIPT LANGUAGE Guía de instalación descargar pdf (Pagina 28)

Multipoint publishing architecture

Flash Media

Streaming Server 1

(FVSS)

Los Angeles

Flash Media

Streaming Server

New Yo rk City

Flash Media

Streaming Server 2

(FVSS)

London

Publishing Point

Philadelphia

Client

Stream data access

Feature in Flash Media Streaming Server and Flash Media Interactive Server; requires Flash Player

9,0,115,0 or later.

Stream data access allows you to control the ability to take a snapshot of a streaming video as a

bitmap on a per-client basis. For example, you can create dynamic thumbnails and video

previews of streaming content.

Stream data access can be congured in your server-side code. Similar to the readAccess and

writeAccess properties, you can now set audioSampleAccess and videoSampleAccess on

streams. Flash Media Server determines the permission setting for each stream and sends a

special data message to the player. Because this feature uses bitmap data, it is only available with

Flash Player 9 or later.

Data keyframes for live video

Feature in Flash Media Streaming Server and Flash Media Interactive Server; requires Flash Player

6 or later.

Oneofthechallengesinlivevideobroadcastistheneedforcurrentstreammetadatatobesent

to viewers who are connecting midstream. Unlike an on-demand stream, where metadata can

always be at the beginning of the stream and received when a user rst subscribes, live streams

can be subscribed to at any time. erefore, these latecomers may never receive the live stream’s

metadata. Data keyframes eliminate this issue by sending metadata to new subscribers when

they join the stream.

Mobile delivery features

FlashMediaServer3.5canstreamvideoinFLV(OnVP6/MP3)formattomobiledeviceswith

FlashLite3installed.FlashLite3haslimitedimplementationoftheNetConnection and

NetStream classes, so it can only receive video, audio, and metadata packets.

WhenFlashLite3connectswithFlashMediaServer,itsendsuseragentdata.Youcanthenuse

this information to lter access or to deliver video that is optimized for the device. e user

agentstringsentbyFlashLite3consistsof:

• Sowarefamilyandversion—Forexample,FlashLite,version3.0

• Deviceidentication—Forexample,aMotorolaRAZRV3xmobilephone

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MACROMEDIA FLASH MEDIA SERVER 2-SERVER MANAGEMENT ACTIONSCRIPT LANGUAGE Guía de instalación Pagina 28

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