te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - How to play mp4 video all major browsers? - Stack Overflow

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    Is there any way to make .mp4 video work in all major browsers? I heard that videojs can help me but I am not sure. Will this library automatically set the flash as a callback if the video format is not supported for the browser? Has any used it before? Please help.

    Is there any way to make .mp4 video work in all major browsers? I heard that videojs can help me but I am not sure. Will this library automatically set the flash as a callback if the video format is not supported for the browser? Has any used it before? Please help.

    • javascript
    • video
    • video.js
    Share Improve this question asked Jul 27, 2015 at 5:07 Homo SapienHomo Sapien 3001 gold badge6 silver badges11 bronze badges 1
    • why cant u use HTML5 video tag? – Vishnu Prasad Commented Jul 27, 2015 at 5:13
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    2 Answers 2

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    At one level you could probably say that mp4 will already work in most major browsers, but, unfortunately, things are not that simple.

    mp4 is a 'container' and the video and audio in it may be encoded with various codecs which you will need to check your browser supports (most support h.264) and even the same codec using different settings (e.g. baseline vs mainline profiles).

    There are also techniques to move the metadata to the start of the mp4 file to allow it stream immediately before the whole file has downloaded - without this it may appear that your video will not play (or it may even not play). See: http://multimedia.cx/eggs/improving-qt-faststart/

    In fact it is probably possible to create an mp4 which will not play in any major browser.

    As Keizom say's best current practice is to provide multiple sources of a video in formats that are known to work with current major browsers.

    It's also worth nothing that the playing field keeps changing as browsers and video format evolve - for example a video player which used or fell back to Silverlight just a short time ago will now no longer work on some of the most popular browsers as they no longer support Silverlight.

    To see the current picture you need to check some of the sites that are updated regularly in line with browser changes. Two good examples are:

    • http://camendesign./code/video_for_everybody/test.html
    • https://developer.mozilla/en-US/docs/Web/HTML/Supported_media_formats

    You can still achieve this while allowing your users to upload just one format (this is what popular video hosting site do). You simply need to convert their uploaded video into the minimum set of formats you need to support the browser set you want to hit.

    Note that if you are worried about quality of playback on different devices and with different network conditions then you may actually have to provide multiple bit rate versions of each video format (so the client can switch between bit rates as network conditions change).

    Of course, this makes your server side more plicated and also uses a fair amount of puting power, so you need to decide if your use cases justifies this investment/effort.

    Whether the .mp4 will "work" or not depends on the OS & browser. Cross-OS/browser support is achieved by supplying multiple sources.

    <video>
    <source src="foobar.mp4" type="video/mp4" />
    <!-- some other alternative sources -->
    <source src="foobar.ogv" type="video/ogv" />
</video>

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