Displaying a semi-transparent FLV file in an MX VideoDisplay control in Flex 4

In a previous example, “Displaying a semi-transparent FLV file in an MX VideoDisplay control in Flex”, we saw how you could display an FLV file with alpha channel transparency in an MX VideoDisplay control in Flex 3 by setting the backgroundAlpha style to 0.

The following example shows how you can display an FLV file with alpha channel transparency in an MX VideoDisplay control in Flex 4 by setting the contentBackgroundAlpha style to 0.

Full code after the jump.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 beta, check out the Adobe Flash Builder 4 page on the Adobe Labs site. To download the latest build of the Flex 4 SDK, see http://opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4. For instructions on using the beta Flex 4 SDK in Flex Builder 3, see "Using the beta Flex 4 SDK in Flex Builder 3".

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/01/21/displaying-a-semi-transparent-flv-file-in-an-mx-videodisplay-control-in-flex-4/ -->
<s:Application name="MX_VideoDisplay_contentBackgroundAlpha_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">
 
    <s:Rect width="100%" height="100%">
        <s:fill>
            <s:LinearGradient rotation="90">
                <s:GradientEntry color="red" />
                <s:GradientEntry color="blue" />
            </s:LinearGradient>
        </s:fill>
    </s:Rect>
 
    <mx:VideoDisplay id="vidDisp"
            source="walking.flv"
            contentBackgroundAlpha="0.0"
            width="80%" height="80%"
            horizontalCenter="0" verticalCenter="0"
            complete="event.currentTarget.play();"/>
 
</s:Application>

The walking.flv can be found at the “Introducing True Alpha Video in Flash 8″ article in the Adobe Flash Developer Center.

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.

Tagged as: contentBackgroundAlpha, Gumbo