如何使用 JWPlayer v8 在外部容器中显示字幕
How to show Captions in an external container using JWPlayer v8
我们的视频使用页面的下三分之一部分进行介绍等，就像电视新闻台所做的那样。当字幕打开时，他们会阻止所有这些，从而引起需要字幕的社区的大量投诉。我试过修改 CSS，但使用响应式布局时，调整播放器的大小会造成严重破坏，通常会使它们完全消失。
是否有可以更改的设置或可使用的技术，使字幕在调整大小时或在外部容器中保持在顶部和视图中？
最终解决方案： 外部字幕为draggable/resizable
所有功劳都归功于@Basildane，我研究了如何使用 VOD 扩展字幕，并使它们可拖动和调整大小，并进行了 CSS 考虑 ADA 的实验：
<!DOCTYPE html>
<html>
<head>
<title>JW External Captions</title>
<meta http-equiv="Expires" content="Fri, Jan 01 1900 00:00:00 GMT">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Lang" content="en">
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
<script src="/jwplayer/v8.10/jwplayer.js"></script>
<style type="text/css">
#myPlayer {
margin-bottom:5px;
}
.jw-captions {
display: none !important;
}
#ccbuffer {
color: white;
background-color: black;
opacity:.7;
font: 22px bold san-serif;
width: 100%;
padding: 15px;
height: 100%;
position:relative;
}
.night {
color:silver !important;
background-color: black !important;
opacity:1 !important;
border-color:silver !important;
}
.highcontrast {
color:white ! important;
background-color: black !important;
opacity:1 !important;
border-color:white !important;
}
.highcontrast2 {
color:black !important;
background-color: yellow !important;
opacity:1 !important;
border-color:black !important;
}
.highcontrast3 {
color:yellow !important;
background-color: black !important;
opacity:1 !important;
border-color:yellow !important;
}
#ccContainer {
position: absolute;
z-index: 9;
border: 1px solid inherit;
overflow: hidden;
resize: both;
width: 640px;
height: 180px;
min-width: 120px;
min-height: 90px;
max-width: 960px;
max-height: 300px;
}
#ccContainerheader {
padding: 3px;
cursor: move;
z-index: 10;
background-color: #2196F3;
color: #fff;
border:1px solid;
}
</style>
</head>
<body>
<h3>JW Draggable Captions Container</h3>
<div id="PlayerContainer" style="width:401px;">
<div id="myPlayer">Loading video...</div>
</div>
<div id="ccContainer">
<!-- Include a header DIV with the same name as the draggable DIV, followed by "header" -->
<div style="float:right;">
<form id="myform">
<select id="ccFontFamily">
<option value="sans-serif">Default Font</option>
<option value="serif">Serif</option>
<option value="monospace">Monospace</option>
<option value="cursive">Cursive </option>
</select>
<select id="ccFontSize" style="">
<option value="22">Default Size</option>
<option value="14">14</option>
<option value="18">18</option>
<option value="24">24</option>
<option value="32">32</option>
</select>
<select id="ccContrast" style="">
<option value="ccdefault">Default Contrast</option>
<option value="night">Night</option>
<option value="highcontrast">High Contrast</option>
<option value="highcontrast2">Black/Yellow</option>
<option value="highcontrast3">Yellow/Black</option>
</select>
<button id="ccFontReset">Reset</button>
</form>
</div>
<div id="ccContainerheader">
Captions (click to move)
</div>
<div id="ccbuffer"></div>
</div>
<script type="text/javascript">
$(document).ready(function() {
jwplayer.key = 'xxxxxxxxxxxxxxxxxxx';
jwplayer('myPlayer').setup({
width: '100%', aspectratio: '16:9', repeat: 'false', autostart: 'false',
playlist: [{
sources: [ { file: 'https:www.example.com/video.mp4'}],
tracks: [ { file: 'https:www.example.com/video-captions.vtt', kind: 'captions', label: 'English', 'default': true } ]
}]
})
// External CC Container
$('#ccContainer').hide();
var position = $('#myPlayer').position();
var width = $('#PlayerContainer').outerWidth();
ccTop = position.top;
ccLeft = (width+50)+'px'
$('#ccContainer').css({'top':ccTop, left:ccLeft });
var observer;
jwplayer().on('captionsList', function (event) {
ccObserver(event);
});
jwplayer().on('captionsChanged', function (event) {
ccObserver(event);
});
videoplayer.on('fullscreen', function(event){
if(event.fullscreen){
$('.jw-captions').css('display','block');
}else{
$('.jw-captions').css('display','none');
}
});
$("#ccFontFamily").change(function() {
$('#ccbuffer').css("font-family", $(this).val());
});
$("#ccFontSize").change(function() {
$('#ccbuffer').css("font-size", $(this).val() + "px");
});
$("#ccContrast").change(function() {
$('#ccContainer').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('#ccContainerheader').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('#ccbuffer').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('select').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('#ccFontReset').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
});
$('#ccFontReset').click(function() {
ccFontReset();
});
function ccFontReset(){
$("#ccFontFamily").val($("#ccFontFamily option:first").val()).trigger('change');
$("#ccFontSize").val($("#ccFontSize option:first").val()).trigger('change');
$("#ccContrast").val($("#ccContrast option:first").val()).trigger('change');
}
ccFontReset();
});
function ccObserver(event){
if (event.track == 0) {
$('#ccContainer').hide('slow');
$('.jw-captions').css('display','block'); // VERY important
if (observer != null){
observer.disconnect();
}
}
else {
$('#ccContainer').show('slow');
$('.jw-captions').css('display','none'); // VERY important
var target = document.querySelector('.jw-captions');
observer = new MutationObserver(function(mutations) {
$('.jw-text-track-cue').each(function(i) {
if (i == 0)
$('#ccbuffer').html( $(this).text() );
else
$('#ccbuffer').append("<br/>" + $(this).text() );
});
});
var config = { attributes: true, childList: true, characterData: true }
observer.observe(target, config);
}
}
// External CC Container - Make the DIV element draggable:
dragElement(document.getElementById("ccContainer"));
function dragElement(elmnt) {
var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
if (document.getElementById(elmnt.id + "header")) {
document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
} else {
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement() {
document.onmouseup = null;
document.onmousemove = null;
}
}
</script>
</body>
</html>
问题：JW 播放器 608 实时字幕格式不干净。
要解决这个问题，请禁用 JW 字幕显示并格式化我们自己的 window，命名为 "ccbuffer"
<style type="text/css">
.jw-captions {
display: none !important;
}
#ccbuffer {
border: 2px solid white !important;
border-radius: 4px;
background-color: black !important;
display: flex;
height: 120px;
margin-top: 6px;
font: 22px bold arial, sans-serif;
color: white;
justify-content: center;
align-items: center;
}
</style>
这里是我展示播放器的地方，ccbuffer 是 div 就在它下面
<div id="myPlayer">
<p style="color: #FFFFFF; font-weight: bold; font-size: x-large; border-style: solid; border-color: #E2AA4F">
Loading video...
</p>
</div>
<div id="ccbuffer" />
DOMSubtreeModified 已弃用。使用 MutationObserver，它对客户端的压力较小。
让我们从 JW 挂钩 'captionsChanged' 事件。如果 track 为 0，则不会选择任何字幕，并且我们会断开观察者。如果选择了字幕，那么我们使用 jquery 将文本从 jw-text-track-cue 元素中拉出，并将其格式化为漂亮的 3 行显示在我们的 ccbuffer window.
<script>
var observer;
jwplayer().on('captionsChanged', function (event) {
if (event.track == 0) {
observer.disconnect();
$('#ccbuffer').hide('slow');
}
else {
$('#ccbuffer').show('slow');
// select the target node
var target = document.querySelector('.jw-captions');
// create an observer instance
observer = new MutationObserver(function(mutations) {
$('.jw-text-track-cue').each(function(i) {
if (i == 0)
$('#ccbuffer').html( $(this).text() );
else
$('#ccbuffer').append("<br/>" + $(this).text() );
});
});
// configuration of the observer:
var config = { attributes: true, childList: true, characterData: true }
// pass in the target node, as well as the observer options
observer.observe(target, config);
}
});
$(document).ready(function () {
$('#ccbuffer').hide();
});
</script>
因此，当用户启用字幕时，ccbuffer window 将滑动打开并显示清晰的 3 行 CC 文本表示。
我们的视频使用页面的下三分之一部分进行介绍等，就像电视新闻台所做的那样。当字幕打开时，他们会阻止所有这些，从而引起需要字幕的社区的大量投诉。我试过修改 CSS，但使用响应式布局时，调整播放器的大小会造成严重破坏，通常会使它们完全消失。
是否有可以更改的设置或可使用的技术，使字幕在调整大小时或在外部容器中保持在顶部和视图中？
最终解决方案： 外部字幕为draggable/resizable
所有功劳都归功于@Basildane，我研究了如何使用 VOD 扩展字幕，并使它们可拖动和调整大小，并进行了 CSS 考虑 ADA 的实验：
<!DOCTYPE html>
<html>
<head>
<title>JW External Captions</title>
<meta http-equiv="Expires" content="Fri, Jan 01 1900 00:00:00 GMT">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Lang" content="en">
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
<script src="/jwplayer/v8.10/jwplayer.js"></script>
<style type="text/css">
#myPlayer {
margin-bottom:5px;
}
.jw-captions {
display: none !important;
}
#ccbuffer {
color: white;
background-color: black;
opacity:.7;
font: 22px bold san-serif;
width: 100%;
padding: 15px;
height: 100%;
position:relative;
}
.night {
color:silver !important;
background-color: black !important;
opacity:1 !important;
border-color:silver !important;
}
.highcontrast {
color:white ! important;
background-color: black !important;
opacity:1 !important;
border-color:white !important;
}
.highcontrast2 {
color:black !important;
background-color: yellow !important;
opacity:1 !important;
border-color:black !important;
}
.highcontrast3 {
color:yellow !important;
background-color: black !important;
opacity:1 !important;
border-color:yellow !important;
}
#ccContainer {
position: absolute;
z-index: 9;
border: 1px solid inherit;
overflow: hidden;
resize: both;
width: 640px;
height: 180px;
min-width: 120px;
min-height: 90px;
max-width: 960px;
max-height: 300px;
}
#ccContainerheader {
padding: 3px;
cursor: move;
z-index: 10;
background-color: #2196F3;
color: #fff;
border:1px solid;
}
</style>
</head>
<body>
<h3>JW Draggable Captions Container</h3>
<div id="PlayerContainer" style="width:401px;">
<div id="myPlayer">Loading video...</div>
</div>
<div id="ccContainer">
<!-- Include a header DIV with the same name as the draggable DIV, followed by "header" -->
<div style="float:right;">
<form id="myform">
<select id="ccFontFamily">
<option value="sans-serif">Default Font</option>
<option value="serif">Serif</option>
<option value="monospace">Monospace</option>
<option value="cursive">Cursive </option>
</select>
<select id="ccFontSize" style="">
<option value="22">Default Size</option>
<option value="14">14</option>
<option value="18">18</option>
<option value="24">24</option>
<option value="32">32</option>
</select>
<select id="ccContrast" style="">
<option value="ccdefault">Default Contrast</option>
<option value="night">Night</option>
<option value="highcontrast">High Contrast</option>
<option value="highcontrast2">Black/Yellow</option>
<option value="highcontrast3">Yellow/Black</option>
</select>
<button id="ccFontReset">Reset</button>
</form>
</div>
<div id="ccContainerheader">
Captions (click to move)
</div>
<div id="ccbuffer"></div>
</div>
<script type="text/javascript">
$(document).ready(function() {
jwplayer.key = 'xxxxxxxxxxxxxxxxxxx';
jwplayer('myPlayer').setup({
width: '100%', aspectratio: '16:9', repeat: 'false', autostart: 'false',
playlist: [{
sources: [ { file: 'https:www.example.com/video.mp4'}],
tracks: [ { file: 'https:www.example.com/video-captions.vtt', kind: 'captions', label: 'English', 'default': true } ]
}]
})
// External CC Container
$('#ccContainer').hide();
var position = $('#myPlayer').position();
var width = $('#PlayerContainer').outerWidth();
ccTop = position.top;
ccLeft = (width+50)+'px'
$('#ccContainer').css({'top':ccTop, left:ccLeft });
var observer;
jwplayer().on('captionsList', function (event) {
ccObserver(event);
});
jwplayer().on('captionsChanged', function (event) {
ccObserver(event);
});
videoplayer.on('fullscreen', function(event){
if(event.fullscreen){
$('.jw-captions').css('display','block');
}else{
$('.jw-captions').css('display','none');
}
});
$("#ccFontFamily").change(function() {
$('#ccbuffer').css("font-family", $(this).val());
});
$("#ccFontSize").change(function() {
$('#ccbuffer').css("font-size", $(this).val() + "px");
});
$("#ccContrast").change(function() {
$('#ccContainer').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('#ccContainerheader').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('#ccbuffer').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('select').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
$('#ccFontReset').removeClass("night highcontrast highcontrast2 highcontrast3").addClass( $(this).val() );
});
$('#ccFontReset').click(function() {
ccFontReset();
});
function ccFontReset(){
$("#ccFontFamily").val($("#ccFontFamily option:first").val()).trigger('change');
$("#ccFontSize").val($("#ccFontSize option:first").val()).trigger('change');
$("#ccContrast").val($("#ccContrast option:first").val()).trigger('change');
}
ccFontReset();
});
function ccObserver(event){
if (event.track == 0) {
$('#ccContainer').hide('slow');
$('.jw-captions').css('display','block'); // VERY important
if (observer != null){
observer.disconnect();
}
}
else {
$('#ccContainer').show('slow');
$('.jw-captions').css('display','none'); // VERY important
var target = document.querySelector('.jw-captions');
observer = new MutationObserver(function(mutations) {
$('.jw-text-track-cue').each(function(i) {
if (i == 0)
$('#ccbuffer').html( $(this).text() );
else
$('#ccbuffer').append("<br/>" + $(this).text() );
});
});
var config = { attributes: true, childList: true, characterData: true }
observer.observe(target, config);
}
}
// External CC Container - Make the DIV element draggable:
dragElement(document.getElementById("ccContainer"));
function dragElement(elmnt) {
var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
if (document.getElementById(elmnt.id + "header")) {
document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
} else {
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement() {
document.onmouseup = null;
document.onmousemove = null;
}
}
</script>
</body>
</html>
问题：JW 播放器 608 实时字幕格式不干净。 要解决这个问题，请禁用 JW 字幕显示并格式化我们自己的 window，命名为 "ccbuffer"
<style type="text/css">
.jw-captions {
display: none !important;
}
#ccbuffer {
border: 2px solid white !important;
border-radius: 4px;
background-color: black !important;
display: flex;
height: 120px;
margin-top: 6px;
font: 22px bold arial, sans-serif;
color: white;
justify-content: center;
align-items: center;
}
</style>
这里是我展示播放器的地方，ccbuffer 是 div 就在它下面
<div id="myPlayer">
<p style="color: #FFFFFF; font-weight: bold; font-size: x-large; border-style: solid; border-color: #E2AA4F">
Loading video...
</p>
</div>
<div id="ccbuffer" />
DOMSubtreeModified 已弃用。使用 MutationObserver，它对客户端的压力较小。 让我们从 JW 挂钩 'captionsChanged' 事件。如果 track 为 0，则不会选择任何字幕，并且我们会断开观察者。如果选择了字幕，那么我们使用 jquery 将文本从 jw-text-track-cue 元素中拉出，并将其格式化为漂亮的 3 行显示在我们的 ccbuffer window.
<script>
var observer;
jwplayer().on('captionsChanged', function (event) {
if (event.track == 0) {
observer.disconnect();
$('#ccbuffer').hide('slow');
}
else {
$('#ccbuffer').show('slow');
// select the target node
var target = document.querySelector('.jw-captions');
// create an observer instance
observer = new MutationObserver(function(mutations) {
$('.jw-text-track-cue').each(function(i) {
if (i == 0)
$('#ccbuffer').html( $(this).text() );
else
$('#ccbuffer').append("<br/>" + $(this).text() );
});
});
// configuration of the observer:
var config = { attributes: true, childList: true, characterData: true }
// pass in the target node, as well as the observer options
observer.observe(target, config);
}
});
$(document).ready(function () {
$('#ccbuffer').hide();
});
</script>
因此，当用户启用字幕时，ccbuffer window 将滑动打开并显示清晰的 3 行 CC 文本表示。