Archive for October, 2009

Youtube video in AS3 FLVPlayback Update(2)

Posted by Dennis in Actionscript 3 on October 22nd, 2009

After the update of yesterday,

Youtube changed the way on how to retreive the video from it’s html page again.
This implies, that the 2 old versions of the proxy no longer worked and that videos could no longer be retreived.

After a quick peek, the solution was rather simple.
Here’s the code for the new and improved proxy:

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<?php
    $id = trim($_REQUEST['id']);
 
    $url = "http://www.youtube.com/watch?v=" . $id . "&fmt=18";
 
    $ch = curl_init();
 
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 
    $info = curl_exec($ch);
 
    if (!preg_match('#\'SWF_ARGS\': (\{.*?\})#is', $info, $matches))
    {
        echo "Check the YouTube URL : {$url} <br/>\n";
        die("Couldnt detect swfArgs");
    }
 
    if (function_exists(json_decode)) # >= PHP 5.2.0
    {
	$swfArgs = json_decode($matches[1]);
        $video_id = $swfArgs->video_id;
        $t = $swfArgs->t;
    }
    else
	{
        preg_match('#"video_id":.*?"(.*?)"#is', $matches[1], $submatches);
        $video_id = $submatches[1];
 
        preg_match('#"t":.*?"(.*?)"#is', $matches[1], $submatches);
        $t = $submatches[1];
    }
 
	curl_close($ch);
 
	$fullPath = "http://www.youtube.com/get_video.php?video_id=" . $video_id . "&t=" . $t; // construct the path to retreive the video from
 
	$headers = get_headers($fullPath); // get al headers from the url
 
	foreach($headers as $header){ //search the headers for the location url of youtube video
		if(preg_match("/Location:/i",$header)){
			$location = $header;			  
		}
	}
 
	header($location); // go to the location specified in the header and get the video
?>

That’s all there is to it.

This file will also be updated again in the source and files download of the original post.

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