MP4 plays when accessed directly, but not when read through PHP, on iOS

Try:

$arquivo_caminho = 'path\file'    if (is_file($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

If you are handling it yourself like that, then you will need to handle byte-range requests yourself as well.

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.