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php - Chrome 问题 - 视频流和 session 冲突

转载 作者:可可西里 更新时间:2023-11-01 15:08:39 24 4
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我在使用 javascript 和 PHP 执行视频时遇到问题。

索引.php

session_start()

// do other stuff
include ‘video.php’

视频.php

<?php
If(!$_REQUEST[‘play’]){
// displaying video.html
}
else
{
// play video
$fp = @fopen($file, 'rb');

$size = filesize($file); // File size
$length = $size; // Content length
$start = 0; // Start byte
$end = $size - 1; // End byte

// Now that we've gotten so far without errors we send the accept range header

/* At the moment we only support single ranges.
* Multiple ranges requires some more work to ensure it works correctly
* and comply with the specifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
*
* Multirange support announces itself with:
* header('Accept-Ranges: bytes');
*
* Multirange content must be sent with multipart/byteranges media type,
* (mediatype = mimetype)
* as well as a boundary header to indicate the various chunks of data.
*/

header('Content-type: video/mp4');
header('Accept-Ranges: bytes');
// multipart/byteranges
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
if (isset($_SERVER['HTTP_RANGE'])){
$c_start = $start;
$c_end = $end;
// Extract the range string
list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
// Make sure the client hasn't sent us a multibyte range
if (strpos($range, ',') !== false){
// (?) Shoud this be issued here, or should the first
// range be used? Or should the header be ignored and
// we output the whole content?
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
// (?) Echo some info to the client?
exit;
} // fim do if

// If the range starts with an '-' we start from the beginning
// If not, we forward the file pointer
// And make sure to get the end byte if spesified
if ($range{0} == '-'){
// The n-number of the last bytes is requested
$c_start = $size - substr($range, 1);
} else {
$range = explode('-', $range);
$c_start = $range[0];
$c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
} // fim do if
/* Check the range and make sure it's treated according to the specs.
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*/
// End bytes can not be larger than $end.
$c_end = ($c_end > $end) ? $end : $c_end;
// Validate the requested range and return an error if it's not correct.
if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size){
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
// (?) Echo some info to the client?
exit;
} // fim do if

$start = $c_start;
$end = $c_end;
$length = $end - $start + 1; // Calculate new content length
fseek($fp, $start);
header('HTTP/1.1 206 Partial Content');
} // fim do if

// Notify the client the byte range we'll be outputting
header("Content-Range: bytes $start-$end/$size");
header("Content-Length: $length");
// Start buffered download
$buffer = 1024 * 8;
while(!feof($fp) && ($p = ftell($fp)) <= $end){
if ($p + $buffer > $end){
// In case we're only outputtin a chunk, make sure we don't
// read past the length
$buffer = $end - $p + 1;
} // fim do if
set_time_limit(0); // Reset time limit for big files
echo fread($fp, $buffer);
flush(); // Free up memory. Otherwise large files will trigger PHP's memory limit.
} // fim do while
fclose($fp);
exit();
}

视频.html

<!doctype html>
<html lang="fr-FR">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<video controls>
<source src="index.php?format=mp4&play=1&id=someid type="video/mp4" />
</video>
</body>
</html>

一切正常,但出于某种我不知道的原因,当我开始播放视频然后单击页面上的链接或使用浏览器的后退按钮时,浏览器会卡住并等待一段时间(可变),然后再继续链接。

探查器指示请求的页面更改处于挂起状态。

如果我将视频光标放在更远的地方,浏览器会立即解锁并跟随我点击的链接。

最后,如果我重新加载该页面,问题就不会再出现了。 chrome 似乎在等待某些东西,但由于我的缓存被禁用,它没有被缓存。

这只发生在 chrome 桌面上,所有其他浏览器都可以正常工作。

** 编辑 **

我找到了问题的根源。

为了播放我的视频,我浏览了我的主文件 index.php,它用作我的路由器,我在其中使用 session_start() 初始化 session 。

当视频正在播放并且我点击链接或浏览器的后退按钮时,我返回到 index.php。这是 chrome 在 session_start() 期间卡住的时候

只要视频还在播放,好像session有冲突。

最佳答案

如果您没有在 session 中编写任何内容,则在 session_start() 之后使用 session_write_close(),或者如果您在之后编写一些 session 变量......

当我们启动 session 时,它会打开 session 文件进行读取。读取仅在脚本结束后关闭。同时,如果您要打开新页面,它将卡住。因此请使用此功能来防止它。

https://www.php.net/manual/en/function.session-write-close.php

session_start();
session_write_close();

// do other stuff
include ‘video.php’

您可以在 session_write_close() 之后读取 session 变量..这没有问题..但是如果您在它之后写一些东西..它不会将该值写入 session 变量。

关于php - Chrome 问题 - 视频流和 session 冲突,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52823297/

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