Chrome问题 - 视频流和会话冲突

Question

Chrome问题 - 视频流和会话冲突

aki*_*kio 13 php http http-content-range

我在javascript和php中实现视频有问题.

的index.php

session_start()

// do other stuff
include ‘video.php’

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video.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 spesifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
 *
 * Multirange support annouces itself with:
 * header('Accept-Ranges: bytes');
 *
 * Multirange content must be sent with multipart/byteranges mediatype,
 * (mediatype = mimetype)
 * as well as a boundry 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();
}

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video.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>

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一切正常但由于某些原因我不知道,当我开始播放视频然后点击我页面上的链接或使用浏览器的后退按钮时,浏览器会冻结并等待一段时间(变量),然后再点击链接.

分析器指示所请求的页面更改处于挂起状态.

如果我将视频光标放得更远,浏览器会立即解锁并按照我点击的链接.

最后,如果我重新加载该页面,问题就不再出现了.似乎chrome等待某些东西但是因为我的缓存被禁用所以它不是缓存.

这仅在Chrome桌面上发生,所有其他浏览器都能正常工作.

**编辑**

我发现问题的根源.

要播放我的视频,我会浏览我的主文件index.php,该文件用作我的路由器,我在其中初始化会话session_start().

播放视频时,我点击浏览器的链接或后退按钮,然后返回index.php.这是在session_start()期间chrome被卡住的时候

只要视频正在播放,看起来就会与会话发生冲突.

Answer 1

Ash*_*dri 1

如果您没有在会话中编写任何内容，则session_write_close()在之后使用 juse session_start()，或者如果您编写一些会话变量，则在之后使用。

\n\n

当我们启动会话时，它将打开会话文件进行读取。读取仅在脚本结束后关闭。同时，如果您要打开新页面，那么它会卡住。所以使用此功能来防止它。

\n\n

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

\n\n

session_start();\nsession_write_close();\n\n// do other stuff\ninclude \xe2\x80\x98video.php\xe2\x80\x99\n

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您可以在 session_write_close() 之后读取会话变量.. 没有问题.. 但如果您在其后写入内容.. 它不会将该值写入会话变量中。

\n

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