php - 如何在 html 文件夹之外无错误地流式传输视频？

Question

在 ubuntu 16 上这是在/html 文件夹外的 var/www/uploads 中，目前为 chmod 777(测试)。如果您在下载视频时尝试暂停，它将播放然后出现错误:

图片.php

<?php

    $filename = $_GET['filename'];
    header('Content-Type: video/mp4');
    readfile("../uploads/" . $filename);
?>

html

<video id="my_video_1" class="video-js vjs-default-skin" width="100%" height="100%"
      controls preload="none" poster='img.png'
      data-setup='{ "playbackRates": [1, 1.5, 2] }'>
    <source src="image.php?filename=myfile.mp4" type='video/mp4' />
</video>

有效，但在 www/html/uploads 内，chmod 777。完全没有错误。这是不好的做法:

<video id="my_video_1" class="video-js vjs-default-skin" width="100%" height="100%"
      controls preload="none" poster='img.png'
      data-setup='{ "playbackRates": [1, 1.5, 2] }'>
    <source src="uploads/myfile.mp4" type='video/mp4' />
</video>

您还想用 mp4 做什么来阻止这种情况发生？

Answer 1

最好的方法是使用“字节范围” header ——这只会返回您需要的文件 block 。维基百科有一个非常简短的介绍 ( https://en.wikipedia.org/wiki/Byte_serving )，但您可以通过谷歌搜索更多内容。

这是我为我的项目编写的函数 - 您可能需要调整它以满足您的具体需求，但它非常通用并且可能开箱即用。

function serve_file_resumable ($file, $contenttype = 'application/octet-stream') {

    // Avoid sending unexpected errors to the client - we should be serving a file,
    // we don't want to corrupt the data we send
    @error_reporting(0);

    // Make sure the files exists, otherwise we are wasting our time
    if (!file_exists($file)) {
        header("HTTP/1.1 404 Not Found");
        exit;
    }

    // Get the 'Range' header if one was sent
    if (isset($_SERVER['HTTP_RANGE'])) {
        $range = $_SERVER['HTTP_RANGE']; // IIS/Some Apache versions
    } else if ($apache = apache_request_headers()) { // Try Apache again
        $headers = array();
        foreach ($apache as $header => $val) {
            $headers[strtolower($header)] = $val;
        }
        if (isset($headers['range'])) {
            $range = $headers['range'];
        } else {
            $range = false; // We can't get the header/there isn't one set
        }
    } else {
        $range = false; // We can't get the header/there isn't one set
    }

    // Get the data range requested (if any)
    $filesize = filesize($file);
    if ($range) {
        $partial = true;
        list($param,$range) = explode('=',$range);
        if (strtolower(trim($param)) != 'bytes') { // Bad request - range unit is not 'bytes'
            header("HTTP/1.1 400 Invalid Request");
            exit;
        }
        $range = explode(',',$range);
        $range = explode('-',$range[0]); // We only deal with the first requested range
        if (count($range) != 2) { // Bad request - 'bytes' parameter is not valid
            header("HTTP/1.1 400 Invalid Request");
            exit;
        }
        if ($range[0] === '') { // First number missing, return last $range[1] bytes
            $end = $filesize - 1;
            $start = $end - intval($range[1]);
        } else if ($range[1] === '') { // Second number missing, return from byte $range[0] to end
            $start = intval($range[0]);
            $end = $filesize - 1;
        } else { // Both numbers present, return specific range
            $start = intval($range[0]);
            $end = intval($range[1]);
            if ($end >= $filesize || (!$start && (!$end || $end == ($filesize - 1)))) {
                $partial = false; // Invalid range/whole file specified, return whole file
            }
        }
        $length = $end - $start + 1;
    } else {
        $partial = false; // No range requested
        $length = $filesize;
    }



    // Send standard headers
    header("Content-Type: $contenttype");
    header("Content-Length: $length");  // was $filesize
    header('Content-Disposition: attachment; filename="'.basename($file).'"');
    header('Accept-Ranges: bytes');

    // if requested, send extra headers and part of file...
    if ($partial) {
        header('HTTP/1.1 206 Partial Content');
        header("Content-Range: bytes $start-$end/$filesize");
        if (!$fp = fopen($file, 'r')) { // Error out if we can't read the file
            header("HTTP/1.1 500 Internal Server Error");
            exit;
        }
        if ($start) {
            fseek($fp,$start);
        }
        while ($length) { // Read in blocks of 8KB so we don't chew up memory on the server
            $read = ($length > 8192) ? 8192 : $length;
            $length -= $read;
            print(fread($fp,$read));
        }
        fclose($fp);
    } else {
        readfile($file); // ...otherwise just send the whole file
    }

    // Exit here to avoid accidentally sending extra content on the end of the file
    exit;

  }

  serve_file_resumable ("../uploads/" . $filename, 'video/mp4');