비디오 관련 질문 좀 드립니다

<input type="button" name="tab_radio" value="<?=$dirname[$i]?>" style="width:115px"  onclick="tab_change(<?=($i+1)?>)" />   <div id="tab_content6" style=" display:none; "><video src="/1111/video/0.mp4" class="v01" style="height:500px;"playsinline loop muted autoplay  type="mp4" alt="map"/></div>  <? } ?> </div> <script type="text/javascript">console.clear();videos = document.querySelectorAll("video");for (var i = 0, l = videos.length; i < l; i++) {    var video = videos[i];    var src = video.src || (function () {        var sources = video.querySelectorAll("source");        for (var j = 0, sl = sources.length; j < sl; j++) {            var source = sources[j];            var type = source.type;            var isMp4 = type.indexOf("mp4") != -1;            if (isMp4) return source.src;        }        return null;    })();    if (src) {        var isYoutube = src && src.match(/(?:youtu|youtube)(?:\.com|\.be)\/([\w\W]+)/i);        if (isYoutube) {            var id = isYoutube[1].match(/watch\?v=|[\w\W]+/gi);            id = (id.length > 1) ? id.splice(1) : id;            id = id.toString();            var mp4url = "http://www.youtubeinmp4.com/redirect.php?video=";            video.src = mp4url + id;        }    }}</script>