使用闪光灯捕捉网络摄像头图像？

Question

是否有任何开源 flash 实用程序可以嵌入到网页上并使用它来捕获用户网络摄像头图像或短时间剪辑并“POST”到我的服务器 servlet？我不寻找流媒体视频，所以我不需要 red5 或 flash 服务器。你们能详细说明一下吗...？

Answer 1

这听起来很适合 Thibault Imbert 的 AS3 GIF 动画编码类。
大约两年前我在大学的一个项目中使用过它。您可以在此处查看。
在我看来，你需要 3 个步骤：

//1.Create a Camera object

//this code comes from the LiveDocs
var camera:Camera = Camera.getCamera();
var video:Video;            
if (camera != null) {
    video = new Video(camera.width * 2, camera.height * 2);
    video.attachCamera(camera);
    addChild(video);
} else {
    trace("You need a camera.");
}

//2. Take one or more 'screenshots' using BitmapData

    var screenshot:BitmapData = new BitmapData(video.width,video.height,false,0x009900);
    screenshot.draw(video);
    //you would probably save more of these in an array called screenshots maybe

//3. Create a GIFEncoder and send it to the server:



//assuming screenshots is an array of BitmapData objects previously saved
var animationEncoder:GIFEncoder = new GIFEncoder();
animationEncoder.setRepeat(0);
animationEncoder.setDelay (150);
animationEncoder.start();
for(var i:int = 1 ; i < screenshots.length ; i++){
    animationEncoder.addFrame(screenshots[i]);
}
animationEncoder.finish();
//save it on the server
var header:URLRequestHeader = new URLRequestHeader ("Content-type", "application/octet-stream");//binary header
var gifRequest:URLRequest = new URLRequest ('http://yourServer/writeGIF.php?name=myFile.gif&method=download');
gifRequest.requestHeaders.push (header);
gifRequest.method = URLRequestMethod.POST;
gifRequest.data = animationEncoder.stream;
sendToURL(gifRequest);



//Obviously you would have listeners to check if everything was ok, and when the operation //is complete.

//The PHP code would be something simple as this

    <?php

    $method = $_GET['method'];
    $name = $_GET['name'];

    if ( isset ( $GLOBALS["HTTP_RAW_POST_DATA"] )) {

        // get bytearray
        $gif = $GLOBALS["HTTP_RAW_POST_DATA"];

        // add headers for download dialog-box
        header('Content-Type: image/gif');
        header('Content-Length: '.strlen($gif ));
        header('Content-disposition:'.$method.'; filename="'.$name.'".gif');

        echo $gif ;

    }  else echo 'An error occured.';

    ?>

就是这样。

请务必查看 Thibault Imbert 的 AS3 GIF 动画编码类 和这个 Web-Cam-Stop-Motion 有趣的应用程序:)
Lee Felarca 的 SimpleFlvWriter 也值得一看，根据您的需求。