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@denilsonsa
Last active March 20, 2016 06:21
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Videosub hack to play embedded .SRT subtitles in HTML5 video
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Playing a local video</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<style>
html, body {
background: black;
color: white;
}
html, body, video {
padding: 0;
margin: 0;
}
video {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
width: 100%;
height: 100%;
}
.videosubbar {
position: absolute;
bottom: 1em;
left: 0;
right: 0;
text-align: center;
background-color: transparent; /* rgba(0, 0, 0, 0.125); */
color: #ffffff;
font-family: Helvetica, Arial, sans-serif;
font-size: 6vh;
line-height: normal;
font-weight: bold;
text-shadow: -1px 0px black, 0px 1px black, 1px 0px black, 0px -1px black;
pointer-events: none;
}
.videosubbar span {
background-color: rgba(0, 0, 0, 0.25);
padding: 0.0625em 0.25em;
display: inline-block;
}
</style>
<script>
// The code below is a highly modified version of:
// VideoSub v0.9.9
// by Thomas Sturm, June 2010 - August 2012
// http://www.storiesinflight.com
// License MIT
// https://github.com/thomassturm/VideoSub
window.addEventListener('load', videosub_main);
function videosub_timecode_min(tc) {
tcpair = tc.split(' --> ');
return videosub_tcsecs(tcpair[0]);
}
function videosub_timecode_max(tc) {
tcpair = tc.split(' --> ');
return videosub_tcsecs(tcpair[1]);
}
function videosub_tcsecs(tc) {
tc1 = tc.split(',');
tc2 = tc1[0].split(':');
secs = Math.floor(tc2[0]*60*60) + Math.floor(tc2[1]*60) + Math.floor(tc2[2]);
return secs;
}
function videosub_main() {
// detect media element track support in browser via the existence of the addtrack method
var myVideo = document.getElementsByTagName('video')[0];
var tracksupport = typeof myVideo.addTextTrack == "function" ? true : false; // check for track element method, if it doesn't exist, the browser generally doesn't support track elements
// first find all video tags
Array.prototype.map.call(
document.querySelectorAll('video'),
function(el) {
var subcontainer = document.createElement("div");
subcontainer.classList.add('videosubbar');
el.parentNode.appendChild(subcontainer);
var subcontainerspan = document.createElement("span");
subcontainer.appendChild(subcontainerspan);
el.subcontainer = subcontainerspan;
// called on AJAX load onComplete (to work around element reference issues)
el.update = function(req) {
el.subtitles = new Array();
records = req.replace('\r', '').split('\n\n');
for (var r=0;r<records.length;r++) {
record = records[r];
el.subtitles[r] = new Array();
el.subtitles[r] = record.split('\n');
}
}
// load the subtitle file
el.update(document.getElementById('subtitle').innerHTML.trim());
el.subcount = 0;
// add event handler to be called when play button is pressed
el.addEventListener('play', function(an_event){
el.subcount = 0;
});
// add event handler to be called when video is done
el.addEventListener('ended', function(an_event){
el.subcount = 0;
});
// add event handler to be called when the video timecode has jumped
el.addEventListener('seeked', function(an_event){
el.subcount = 0;
while (videosub_timecode_max(el.subtitles[el.subcount][1]) < this.currentTime.toFixed(1)) {
el.subcount++;
if (el.subcount > el.subtitles.length-1) {
el.subcount = el.subtitles.length-1;
break;
}
}
});
// add event handler to be called while video is playing
el.addEventListener('timeupdate', function(an_event){
var subtitle = '';
// check if the next subtitle is in the current time range
if (this.currentTime.toFixed(1) > videosub_timecode_min(el.subtitles[el.subcount][1]) && this.currentTime.toFixed(1) < videosub_timecode_max(el.subtitles[el.subcount][1])) {
subtitle = el.subtitles[el.subcount].slice(2).join('<br>');
}
// is there a next timecode?
if (this.currentTime.toFixed(1) > videosub_timecode_max(el.subtitles[el.subcount][1]) && el.subcount < (el.subtitles.length-1)) {
el.subcount++;
}
// update subtitle div
if(this.subcontainer.innerHTML != subtitle){
this.subcontainer.innerHTML = subtitle;
}
});
});
}
</script>
</head>
<body>
<video controls>
<source src="Your local video file.mp4" type="video/mp4">
<!-- Chrome does not allow reading subtitle files from file:// -->
<!--track label="English" kind="subtitles" srclang="en" src="Your local subtitle cannot be loaded.vtt" default-->
</video>
<script type="text/srt" id="subtitle">
1
00:00:02,500 --> 00:00:05,250
Instead of loading an external .vtt file,
2
00:00:05,250 --> 00:00:09,750
The workaround is to embed the .srt file
contents inside a script tag.
3
00:00:10,001 --> 00:00:12,411
This implementation is quick and dirty
4
00:00:12,411 --> 00:00:16,750
and uses .innerHTML
instead of anything safer.
</script>
</body>
</html>
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