通过javascript播放mp4视频
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我有一个包含html5视频的响应式网站.我有一些javascript检查视频元素的大小是否低于某个阈值.如果是这样,它将删除控件,将视频播放按钮叠加图像放在视频元素的顶部,然后将click事件添加到容纳视频元素的容器中.单击容器时,它会将视频复制到模式对话框中并播放视频.
这是窘境：
> webm版本没有任何问题.
>模式视图的mp4版本在Safari中没有问题.
>如果mp4在适当位置播放(即足够大以至于不需要模态窗口),它就可以正常播放.
>模式视图的mp4版本无法在Chrome或IE中播放.
>但是,如果我有内置的DOM,它将在Chrome或IE中运行
检查员打开(例如IE的F12工具).
这可以看到here.
这是HTML：
<div class="video modal-trigger col-lg-4 col-md-4 col-sm-4">
<canvas></canvas>
<video preload="auto" controls="controls" poster="img/why-autologel-poster.png">
<source src="media/why-autologel.m4v" type='video/mp4'>
<source src="media/why-autologel.webm" type='video/webm'>
</video>
</div>
<div class="col-lg-8 col-md-8 col-sm-7">
<h2 class="modal-heading">
Why AutoloGel?
</h2>
<p class="modal-copy">
See what AutoloGel offers to your patients.
</p>
</div>
<!-- Modal Window -->
<div class="modal fade" id="modal-window" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title" id="myModalLabel"></h4>
</div>
<div class="modal-body">
<div class="media"></div>
<div class="copy"></div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
这是javascript：
$(document).ready(function() {
// Play very small videos in modal box
if ( $(window).width() > 750 ) {
var modalvideo = document.getElementsByTagName('video');
// Hide controls for very small videos
for (var i = 0; i < modalvideo.length; i++) {
if ( $(modalvideo[i]).width() < 470 ) {
$(modalvideo[i]).removeAttr('controls');
if ( $('html').hasClass('IE-9') ) {
$(modalvideo[i]).after('<img class="poster-overlay" src="img/poster-overlay-ie9.png" alt="play video">');
} else {
$(modalvideo[i]).after('<img class="poster-overlay" src="img/poster-overlay.png" alt="play video">');
}
}
}
// Add click event to video container that brings up video in a modal window
$('.modal-trigger').on("click", function() {
if ( $(this).width() < 470 ) {
// Get video, title and any copy text
var media = $(this).html();
var title = $(this).next().children('.modal-heading').text();
var copy = $(this).next().children('.modal-copy').text();
// Insert video, title and copy text into modal window
$('.modal-title').html(title);
$('.modal-body > .media').html(media);
$('.modal-body > .copy').text(copy);
$('#modal-window .poster-overlay').remove('');
$('#modal-window').modal('show');
// Autoplay video after modal window has rendered
$('#modal-window').on('shown.bs.modal', function() {
modalvideo[modalvideo.length - 1].setAttribute('controls', 'controls');
modalvideo[modalvideo.length - 1].play();
});
// Stop play video when modal window is closed
$('#modal-window').on('hide.bs.modal', function() {
modalvideo[modalvideo.length - 1].pause();
});
}
});
}
});
谢谢你的帮助！
解决方法:
弄清楚了.
问题分为两部分.对于Chrome,它的缓存和复制的DOM元素有一些怪癖.我认为当开发人员工具处于打开状态时它会起作用,因为缓存已被禁用.只需在src属性的末尾应用随机GET变量,以便复制的视频元素将其标记为与缓存的文件不同的文件,从而解决了问题.
与IE它有点不同. HubSpot使用Amazon S3作为其CDN,当我查看视频文件的标题时,其内容类型设置为Internet Explorer不支持的application / octet-stream. AWS允许在上传文件时设置此项,但HubSpot在幕后执行此操作,没有用户能够设置我知道的内容.他们正在努力修复.
最终工作的解决方案：
$(document).ready(function() {
// Play very small videos in modal box
if ( $(window).width() > 750 ) {
var allvideos = $('video');
// Hide controls for very small videos
for (var i = 0; i < allvideos.length; i++) {
if ( $(allvideos[i]).width() < 470 ) {
$(allvideos[i]).removeAttr('controls');
if ( $('html').hasClass('IE-9') ) {
$(allvideos[i]).after('<img class="poster-overlay" src="img/poster-overlay.png" alt="play video">');
} else {
$(allvideos[i]).after('<img class="poster-overlay" src="img/poster-overlay.png" alt="play video">');
}
}
}
// Add click event to video container that brings up video in a modal window
$('.modal-trigger').on('click', function() {
if ( $(this).width() < 470 ) {
// Get video/img, title and any copy text
var media = $(this).html();
var title = $(this).next().children('.modal-heading').text();
var copy = $(this).next().children('.modal-copy').text();
if (! title.length) { title = '<br>'; }
// Insert video, title and copy text into modal window
var modalsrc = [];
var modaltype = [];
$(media).children('source').each(function() {
modalsrc.push( $(this).attr('src') );
modaltype.push( $(this).attr('type') );
});
$('.modal-title').html(title);
$('.modal-body > .media').html(media);
$('.modal-body > .copy').text(copy);
$('#modal-window .poster-overlay').remove('');
// Assign a random version to video src to bypass cache
var modalsources = $('#modal-window source');
var nocachesrc = '';
for (var i = 0; i < modalsources.length; i++) {
nocachesrc = modalsrc[i] + '?rnd=' + Math.random()*Math.random();
modalsources[i].setAttribute('src', nocachesrc);
modalsources[i].setAttribute('type', modaltype[i]);
}
var modalvideo = $('#modal-window video');
modalvideo[0].setAttribute('controls', 'controls');
// Reveal modal window and play video
$('#modal-window').modal('show');
$('#modal-window').on('shown.bs.modal', function() {
modalvideo[0].play();
});
// Stop playing video when modal window is closed
$('#modal-window').on('hide.bs.modal', function() {
modalvideo[0].pause();
});
}
});
}
});
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