直接访问时播放MP4，但在iOS上通过PHP读取则不播放

Question

我使用PHP脚本在提供视频请求之前验证它们。此脚本可在桌面上使用Safari和Chrome按预期工作。但是在iOS上，我得到一个破坏的播放按钮。

我确信该视频已正确编码为iPhone / iPad，因为当我直接访问它时，它会按预期工作。

相关的PHP代码：

$file_name = 'test-video.mp4';
$file_size = (string)(filesize($file_name));
header('Content-Type: video/mp4');
header('Content-Length: '.$file_size);
readfile_chunked($file_name);
exit;

（readfile_chunked()与readfile()类似，但对于非常大的文件，可在PHP手册页的评论中找到：http://php.net/manual/en/function.readfile.php。无论如何，test-video.mp4只是readfile() ~5 MB，小于内存限制 - 在这种情况下，我实际上可以用正常test-video.mp4替换并产生完全相同的行为。）

我直接访问Accept-Ranges:bytes Connection:Keep-Alive Content-Length:5558749 Content-Type:video/mp4 Date:Sun, 27 Jun 2010 21:02:09 GMT Etag:"1c04757-54d1dd-489944c5a6400" Keep-Alive:timeout=10, max=30 Last-Modified:Tue, 22 Jun 2010 01:25:36 GMT Server:Apache/2.2.15 (CentOS) mod_ssl/2.2.15 0.9.8l DAV/2 mod_auth_passthrough/2.1 FrontPage/5.0.2.2635 时收到的标题是：

Connection:Keep-Alive
Content-Disposition:inline; filename="test-video.mp4"
Content-Length:5558749
Content-Type:video/mp4
Date:Sun, 27 Jun 2010 21:03:32 GMT
Keep-Alive:timeout=10, max=15
Server:Apache/2.2.15 (CentOS) mod_ssl/2.2.15 0.9.8l DAV/2 mod_auth_passthrough/2.1 FrontPage/5.0.2.2635
X-Powered-By:PHP/5.2.13

PHP脚本的标题是：

{{1}}

我尝试了许多不同的标题排列，甚至将它们与直接请求的标题完全匹配，但无济于事。

有没有人在iOS上通过PHP提供HTML5视频成功？

[注意：我会尝试使用X-Sendfile，但该网站位于访问权限非常有限的共享主机上。]

编辑：我读到iOS可能对文件扩展名很敏感，所以我尝试设置一个RewriteRule，将MP4请求重写回我原来的PHP脚本，但这也无济于事。

Answer 1

尝试：

$arquivo_caminho = 'path\file'

    if (is_file($arquivo_caminho)){
        header("Content-type: video/mp4"); // change mimetype

        if (isset($_SERVER['HTTP_RANGE'])){ // do it for any device that supports byte-ranges not only iPhone
            rangeDownload($arquivo_caminho);
        } else {
            header("Content-length: " . filesize($arquivo_caminho));
            readfile($arquivo_caminho);
        } // fim do if
    } // fim do if

    function rangeDownload($file){
        $fp = @fopen($file, 'rb');

        $size   = filesize($file); // File size
        $length = $size;           // Content length
        $start  = 0;               // Start byte
        $end    = $size - 1;       // End byte
        // Now that we've gotten so far without errors we send the accept range header
        /* At the moment we only support single ranges.
         * Multiple ranges requires some more work to ensure it works correctly
         * and comply with the spesifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
         *
         * Multirange support annouces itself with:
         * header('Accept-Ranges: bytes');
         *
         * Multirange content must be sent with multipart/byteranges mediatype,
         * (mediatype = mimetype)
         * as well as a boundry header to indicate the various chunks of data.
         */
        header("Accept-Ranges: 0-$length");
        // 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);
    } // fim do function

Answer 2

如果您自己处理它，那么您自己也需要处理字节范围请求。

Answer 3

如果您从http url读取文件，那么您可以使用以下代码获取filsize（）函数以获取文件大小

function getFileSize($file) {
       $ch = curl_init($file);
       curl_setopt($ch, CURLOPT_NOBODY, true);
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
       curl_setopt($ch, CURLOPT_HEADER, true);
       curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
       $data = curl_exec($ch);
       curl_close($ch);
       $contentLength=0;
       if (preg_match('/Content-Length: (\d+)/', $data, $matches)) {

           // Contains file size in bytes
           $contentLength = (int)$matches[1];

       }
       return $contentLength;
}

Answer 4

Please note that this is code (https://mobiforge.com/design-development/content-delivery-mobile-devices) is a lifesaver. However be on the lookout for the line "if ($range{0} == '-'){" or "if ($range0 == '-'){" it should be if ($range[0] == '-'){ This typo resulted in a very long time figuring out why it did not work.

Answer 5

我的代码有问题。

修正：

 set_time_limit(0); // Reset time limit for big files

 ob_clean(); //added

 echo fread($fp, $buffer);
 flush(); // Free up memory. Otherwise large files will trigger PHP's memory limit.

Answer 6

如上所述，使用PHP流式传输或播放MP4视频，如果您想在Safari和iOS上正确播放，则需要处理字节范围。

在前面的答案中提到的

rangeDownload()功能可以很好地完成工作。

我想提一下这个难题的另一部分 - 确保视频中的来源以.mp4结尾<video source="url/yourfile.php/referenceForFile.mp4">。这使得浏览器成为一个视频文件，并开始将其视为一个。

在yourfile.php内，您可以使用$_SERVER['PATH_INFO']或在REQUEST_URI内获取文件的传入参考。无需将其作为?id=someId.mp4传递，直接斜杠方法看起来更像是真实文件。

总而言之，根据我从PHP正确提供视频文件的经验，您需要：

• 字节范围支持。浏览器告诉服务器它需要哪个文件部分，服务器需要响应该字节范围内容。
• 将moov atom放在文件的开头（您可以使用ffmpeg的-movflags +faststart或MP4Box）
• <video source="...file.mp4">视频标记的源属性需要看起来像.mp4文件。如果没有这个，我的视频只能在Chrome中播放，而不能在Safari / iOS中播放。
• 直接播放HTML5播放器，或者您可以使用videojs
等库

我是根据我在音乐视频网站上提供数千个视频的经验写的。虽然对所有人来说可能并非如此，但我发现这种跨浏览器和跨设备设置正如预期的那样。