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<!DOCTYPE html>
<html xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml" lang="en-US"><head>
<title>Converting SRT files to WebVTT files</title>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
<style>
table {
width: 80%;
background-color: rgb(241,241,241);
border: gray 1px solid;
border-collapse: collapse;
}
table thead {
background-color: rgb(80,144,240);
}
table td, table th {
border: gray 1px solid;
padding: 7px;
}
table body tr {
background: #b8d1f3;
}
table tbody tr:hover {
background-color: rgb(174,211,248);
}
</style>
</head>
<body>
<h1>WebVTT support in browsers</h1>
<table>
<thead>
<tr>
<th>Feature</th>
<th>Chrome/Opera</th>
<th>Firefox</th>
<th>Internet Explorer</th>
<th>Safari</th>
</tr>
</thead>
<tbody>
<tr>
<td>Required Header</td>
<td>WEBVTT</td>
<td>WEBVTT</td>
<td>WEBVTT FILE</td>
<td>WEBVTT</td>
</tr>
<tr>
<td>File MIME Type</td>
<td>sniffing</td>
<td>sniffing</td>
<td>'text/vtt'</td>
<td>sniffing</td>
</tr>
<tr>
<td>Menu in video controls to select tracks</td>
<td>CC button</td>
<td></td>
<td>✔</td>
<td>✔</td>
</tr>
<tr>
<td>JavaScript TextTrack API</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
</tr>
<tr>
<td>Rendering of text-only captions & subtitles</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
</tr>
<tr>
<td>Cue styling with ::cue and ::cue()</td>
<td>✔</td>
<td></td>
<td></td>
<td>✔</td>
</tr>
<tr>
<td>Cue markup incl. Timestamps</td>
<td>✔</td>
<td>✔</td>
<td></td>
<td>✔</td>
</tr>
<tr>
<td>Vertical Cue setting</td>
<td>✔ (buggy)</td>
<td></td>
<td></td>
<td>✔</td>
</tr>
<tr>
<td>Line, Align, Position, Size Cue settings</td>
<td>✔</td>
<td>✔</td>
<td></td>
<td>✔</td>
</tr>
<tr>
<td>Comments (NOTE)</td>
<td>✔</td>
<td>✔</td>
<td></td>
<td>✔</td>
</tr>
<tr>
<td>Regions</td>
<td>Behind Flag</td>
<td></td>
<td></td>
<td>Behind Flag</td>
</tr>
<tr>
<td>Rendering of text descriptions</td>
<td>With extension</td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>Rendering of chapters</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<h1>Converting SRT files to WebVTT files</h1>
<h4>Cut and paste SRT file into text entry box:</h4>
<textarea cols="80" id="srt" name="content" rows="20"></textarea>
<button onclick="convert()">Convert</button>
<div id="webvtt"></div>
<script>
function convert() {
input = document.getElementById("srt");
output = document.getElementById("webvtt");
srt = input.value;
webvtt = srt2webvtt(srt);
output.innerHTML = "<textarea rows=20 cols=80>"+webvtt+"</textarea>";
}
function srt2webvtt(data) {
// remove dos newlines
var srt = data.replace(/\r+/g, '');
// trim white space start and end
srt = srt.replace(/^\s+|\s+$/g, '');
// get cues
var cuelist = srt.split('\n\n');
var result = "";
if (cuelist.length > 0) {
result += "WEBVTT\n\n";
for (var i = 0; i < cuelist.length; i=i+1) {
result += convertSrtCue(cuelist[i]);
}
}
return result;
}
function convertSrtCue(caption) {
// remove all html tags for security reasons
//srt = srt.replace(/<[a-zA-Z\/][^>]*>/g, '');
var cue = "";
var s = caption.split(/\n/);
while (s.length > 3) {
s[2] += '\n' + s.pop();
}
var line = 0;
// detect identifier
if (!s[0].match(/\d+:\d+:\d+/) && s[1].match(/\d+:\d+:\d+/)) {
cue += s[0].match(/\w+/) + "\n";
line += 1;
}
// get time strings
if (s[line].match(/\d+:\d+:\d+/)) {
// convert time string
var m = s[1].match(/(\d+):(\d+):(\d+)(?:,(\d+))?\s*--?>\s*(\d+):(\d+):(\d+)(?:,(\d+))?/);
if (m) {
cue += m[1]+":"+m[2]+":"+m[3]+"."+m[4]+" --> "
+m[5]+":"+m[6]+":"+m[7]+"."+m[8]+"\n";
line += 1;
} else {
// Unrecognized timestring
return "";
}
} else {
// file format error or comment lines
return "";
}
// get cue text
if (s[line]) {
cue += s[line] + "\n\n";
}
return cue;
}
</script>
<p>Source code at <a href="https://github.com/silviapfeiffer/silviapfeiffer.github.io">Github</a>.</p>
<p>Thanks to David Desmeurs for his contribution.</p>
</body>
</html>