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Using a SMIL file 713

Using a SMIL file

To handle multiple streams for multiple bandwidths, the VideoPlayer class uses a helper class

(NCManager) that supports a subset of SMIL. SMIL is used identify the location of the video

stream, the layout (width and height) of the FLV file, and the source FLV files that correspond

to the different bandwidths. It can also be used to specify the bit rate and duration of the

FLV file.

The following example shows a SMIL file that streams multiple bandwidth FLV files from a

FCS using RTMP:

<smil>

<head>

<root-layout width="240" height="180" >

</layout>

</head>

<body>

<video src="myvideo_mdm.flv" system-bitrate="56000"

dur="3:00.1">

<video src="myvideo_isdn.flv" system-bitrate="128000"

dur="3:00.1">

</switch>

</body>

</smil>

The <head> tag may contain the <meta> and <layout> tags. The <meta> tag supports only

the

base attribute, which is used to specify the URL of the streaming video (RTMP from

a FCS).

The

<layout> tag supports only the root-layout element, which is used to set the height

and

width attributes, and, therefore, determines the size of the window in which the FLV file

is rendered. These attributes accept only pixel values, not percentages.

Within the body of the SMIL file, you can either include a single link to a FLV source file or,

if you’re streaming multiple files for multiple bandwidths from a FCS (as in the previous

example), you can use the

<switch> tag to list the source files.

The

video and ref tags within the <switch> tag are synonymous—they both can use the

src attribute to specify FLV files. Further, each can use the region, system-bitrate, and

dur attributes to specify the region, the minimum bandwidth required, and the duration of

the FLV file.

Within the

<body> tag, only one occurrence of either the <video>, <src>, or <switch> tags

is allowed.