MACROMEDIA FLASH MEDIA SERVER 2-SERVER-SIDE ACTIONSCRIPT LANGUAGE Przewodnik Instalacji Pobierz pdf (Strona 11)

Benets of streaming versus HTTP delivery

erearethreemethodsfordeliveringvideoovertheInternetusingAdobeFlashPlayer:

• Embeddedvideo

• Progressivedownload

• Streaming

Embeddedvideoisrarelyusedexceptinveryspecializedapplicationswithlow-quality,short

video clips, so our discussion will focus on progressive download and streaming.

Inbothprogressiveandstreamingdelivery,thevideocontentisexternaltotheSWFle.To

deploy video content to the web, the SWF le and the video le would be uploaded to a server.

Keeping the video external and separate oers a number of benets over the embedded video

method, including:

• Easytoupdate—Accommodatesdynamiccontentandit’srelativelyeasytoaddorchange

content independent of the video player and without the need to republish the SWF le.

• SmallSWFlesize—YourSWFlecanremainverysmallforfasterpageloading,allowingthe

video to be delivered when the user requests it.

• Betterperformance—BecausetheFLVandSWFlesareseparate,theuserwillhaveabetter

playback experience.

Note: Although this section focuses on the delivery of video les, the same methods can be used to deliver

audio les. In other words, audio les can also be embedded, progressively downloaded, or streamed.

Progressive download video delivery

SinceFlashMX2004,progressivedownloadhasbeensupportedforvideodelivery.ismethod

allows developers to load external video les into a Flash or Flex interface and play them back

duringruntime.iscanbeaccomplishedusingActionScriptcommandswiththeVideoobject

or playback components, or by setting parameters for the playback components in the authoring

environment(asshowninthefollowinggure).

Parameters set for an FLVPlayback component to stream an external video le into a SWF

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 54 55

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MACROMEDIA FLASH MEDIA SERVER 2-SERVER-SIDE ACTIONSCRIPT LANGUAGE Przewodnik Instalacji Strona 11