渐进式流媒体问题：
我一直在尝试使用xmoov.com中的示例来获取视频的一部分，如博客中所述： http://polygeek.com/1423_flex_video-streaming-php-xmoov
代码适用于他们拥有的视频链接，但是当我将链接更改为服务器上的视频文件时，我在“Alert.show”（e）行上获取onMetaData（e：MetadataEvent）函数的空对象错误.info.keyframes.filepositions.toString（））;“
也在onSeek（e：SliderEvent）上线“while（_keyFrame_timePositions [i]＆lt; seekTo）{ 我++ }“
我的PHP代码：
受保护的函数serve_media_test（$ key，$ position =''） {
如果（空（$位置）） $ position = 0; $ seekPos = intval（$ position）; $ key = addslashes（$ key）; $ media = new C7_Media（）; $ row = $ media-＆gt; fetchRow（“hash ='$ key'AND'”。$ _ SERVER ['SERVER_NAME']。“'LIKE CONCAT（'％'，server_domain，'％'）”）; 如果（空（$行）） 抛出新的C7_Exception（'找不到给定的密钥OR文件不在此服务器上的文件'）; $ row-＆gt; views = $ row-＆gt; views + 1; //增加此媒体文件的视图 $行向＆GT;保存（）;
//发送文件 $ local_file = C7_Bootstrap :: getConfig（） - ＆gt; user-＆gt; media-＆gt; store。'/'。$ row-＆gt; location; //应该发送给客户端的本地文件 $ download_file = stripslashes（$ row-＆gt; original_name）; //用户默认获取的文件名 $ download_rate = C7_Bootstrap :: getConfig（） - ＆gt; user-＆gt; storage-＆gt; downloadrate-＆gt; kbps; //设置下载速率限制（kb / s） if（file_exists（$ local_file）＆amp;＆amp; is_file（$ local_file）） {
//$fh = fopen($local_file, 'rb') or die ('<b>ERROR:</b> xmoov-php could not open (' . $download_file . ')');
$fileSize = filesize($local_file) - (($seekPos > 0) ? $seekPos + 1 : 0);
// send headers
header('Pragma: private');
header('Expires: '.date('D, d M Y H:i:s \G\M\T', time() + 7200));
header('Cache-control: private, max-age=7200, must-revalidate'); //longer age set for media file
header('Content-Length: '.filesize($local_file));
header('Content-Disposition: filename='.md5($local_file));
header('Content-Type: video/x-flv');
/*$scratch = explode('.', $local_file); //determine file type by extension
$file_extension = $scratch[count($scratch)-1];
switch($file_extension)
{
case 'flv': header('Content-Type: video/x-flv');
break;
case 'mp4': header('Content-Type: video/mp4');
break;
default: header('application/octet-stream');
break;
}*/
flush(); // flush content
//$file = fopen($local_file, "r");
$file = fopen($local_file, 'rb'); // open file stream
# FLV file format header
if($seekPos != 0)
{
print('FLV');
print(pack('C', 1));
print(pack('C', 1));
print(pack('N', 9));
print(pack('N', 9));
}
//Seeks on a file pointer
fseek($file, $seekPos);
while(!feof($file))
{
print fread($file, round($download_rate * 1024)); // send the current file part to the browser
ob_flush(); //flush php buffer
flush(); // flush apache buffer
//sleep(1); // sleep one second
}
fclose($file); // close file stream
}
else
throw new C7_Exception("File= $local_file, could not be downloaded");
}
和flex代码：
width="360" height="280"
creationComplete="init();">
<fx:Script>
<![CDATA[
import com.adobe.rtc.collaboration.FilePublisher;
import mx.controls.Alert;
import mx.events.MetadataEvent;
import mx.events.SliderEvent;
private var _keyFrame_filePositions:Array;
private var _keyFrame_timePositions:Array;
private var _isMouseDown:Boolean = false;
private var _delay:Timer;
// other videos that you can test with at polyGeek.com:
// 5 second videos: sea.flv, sky.flv
// 30 second videos: cossacks.flv, delivery.flv
// Longish video: matrix.flv
// Please use these only for testing.
private var _videoFilename:String = "delivery.flv";
// The path to the host is used in two places: init() and onSeek()
private var _host:String = "http://polygeek.com/xmoov.php?file=";
//private var _host:String = "http://localhost:8080/xmoov.php?file=";
private function init():void {
// The '0' at the end corresponds to the filePosition to start at.
// If you want to start at a position other than the beginning you
// will have to wait until you have the metaData and know a filePosition
// that has a keyFrame to seek to.
//vidWin.source = _host + _videoFilename + "&position=" + 0;
vidWin.source = 'https://mt1-s3.cloud.cm/rpc/raw?c=Media&m=download_media&key=04fa10db1c64965f6d7a728afd5afa49';
// This timer is run after the user uses the timeline to seek.
// If we don't do this then the timeline-thumb bounces around.
_delay = new Timer( 250, 1 );
_delay.addEventListener( TimerEvent.TIMER, onDelay );
}
private function onPlayheadUpdate():void {
// This moves the thumb on the timeline while the video is playing.
// If the user is seeking then don't run this.
// Also, ignore if playheadTime == 0 because after seeking it
// momentarily pops back to 0
if( !_isMouseDown && vidWin.playheadTime > 0 ) {
timeline.value = vidWin.playheadTime;
}
}
private function onDelay( e:TimerEvent ):void {
// The delay is over so now set the _isMouseDown back to false.
// If you notice that your timeline-thumb is bouncing after a seek
// then you may want to increase the length of the delay.
_isMouseDown = false;
}
private function onMetaData( e:MetadataEvent ):void {
// Set the timeline maximum to the duration of the video
Alert.show(e.info.keyframes.filepositions.toString());
timeline.maximum = e.info.duration;
// Places where there's a keyframe
_keyFrame_filePositions = e.info.keyframes.filepositions;
// The video-time where there is keyframe
_keyFrame_timePositions = e.info.keyframes.times;
}
private function onSeek( e:SliderEvent ):void {
// Seek to the value of the timer. I'm only setting this to the value of a
// local variable because it may be accessed many hundreds of times during the
// while-loop. This allows for faster access.
var seekTo:Number = e.value;
// _keyFrame_timePositions is an Array of all the time values of the video where there is a keyframe.
// We want to find the element of _times that is largest but less than where we are seeking to.
// a for-loop here could work just as well but while-loops run a little faster.
var i:int = 0;
while( _keyFrame_timePositions[i] < seekTo ) {
i++
}
// Since the _keyFrame_timePositions Array and the _keyFrame_filePositions Array are
// parallel with each other the i-th _keyFrame_timePositions corresponds to the
// i-th _keyFrame_filePositions value.
// We need to tell the xmoov.php file to seek to a filePosition.
//vidWin.source = _host + _videoFilename + "&position=" + _keyFrame_filePositions[i];
vidWin.source = 'https://mt1-s3.cloud.cm/rpc/raw?c=Media&m=download_media&key=04fa10db1c64965f6d7a728afd5afa49';
// Start the _delay Timer so that the timeline-thumb doesn't bounce.
_delay.start();
}
]]>
</fx:Script>
<extensions:SmoothVideo
id="vidWin"
volume="0"
playheadUpdateInterval="10"
playheadUpdate="onPlayheadUpdate();"
bufferTime="0.5"
width="320" height="240"
metadataReceived="onMetaData( event );"/>
<mx:HSlider
id="timeline"
buttonMode="true"
width="320"
mouseDown="{ _isMouseDown = true; }"
change="onSeek( event );" />
我无法弄清楚我在这里做错了什么。以及如何解决它。
任何建议表示赞赏。
此致 Zeeshan
答案 0 :(得分：0)
如果没有媒体服务器，你不能拥有渐进式视频，比如FMS或Wowza（IMO越好）。
至于示例，他们使用旧的弃用代码。您将需要某种服务器端解决方案来剪切并仅返回您需要的部分视频，但我不知道有任何实用程序可以执行此操作。