最近看到一首很好的英文MTV原版，没又字幕，自己找字幕，只找到LRC，ffmpeg不支持LRC，网上在线转了SRT。
Subtitle Converter | Free tool | GoTranscript
然后用 ffmpeg 加字幕
ffmpeg -i LoveMeLikeYouDo.mp4 -vf subtitles=LoveMeLikeYouDo.srt LoveMeLikeYouDo1.mp4打开 LRC 和 SRT 都是纯文本，可以自己做一个。
<html>
<head>
<meta charset="UTF-8">
<title>LRC转SRT</title>
</head>
<body>
LRC：<input id="file" type="file"> <button id="button_srt">SRT</button>
<script>
var file0, s='';
file.addEventListener('change', function(){ read(); });
button_srt.addEventListener('click', function(){ lrc2srt(); });
function read() {
file0 = file.files[0];
var reader = new FileReader();
reader.readAsText(file0);
reader.onload = function(e){
s = reader.result;
};
}
function lrc2srt() {
var s1='', time=[], st=[];
var sl = s.split('\n');
for (i=0; i<sl.length; i++) {
if (sl[i].indexOf(']') != -1) {
var sl1 = sl[i].split(']');
time.push(sl1[0].substring(sl1[0].indexOf('[') + 1));
st.push(sl1[1].replace(/'/g, "'"));
}
}
//合并时间重复
for (i=0; i<time.length; i++) {
if (i > 1 && i < time.length - 1 && time[i] == time[i+1]) {
st[i-1] = st[i-1] + '\n' + st[i]; //错位合并上一句
time.splice(i, 1);
st.splice(i, 1);
}
}
for (i=0; i<time.length; i++) {
s1 = s1 + (i+1) + '\n';
if (i < time.length - 1) {
var time1 = '00:' + time[i];
if (time1.indexOf('.') == -1)
time1 = time1 + '.000';
var time2 = '00:' + time[i+1];
if (time2.indexOf('.') == -1)
time2 = time2 + '.000';
s1 = s1 + time1 + ' --> ' + time2 + '\n';
} else {
var time1 = '00:' + time[i];
if (time1.indexOf('.') == -1)
time1 = time1 + '.000';
s1 = s1 + time1 + ' --> ' + time1 + '\n';
}
s1 = s1 + st[i] + '\n\n';
}
var blob = new Blob([s1], { type:'text/plain,charset=UTF-8' });
var url = URL.createObjectURL(blob);
//查看
//window.open(url);
//下载
var link = document.createElement('a');
link.download = file0.name.substring(0,file0.name.indexOf('.')) + '.srt';
link.href = url;
link.click();
}
</script>
</body>
</html>视频处理CPU满载，处理时长和视频时间一样长！
有些字幕还是没对上，需要对LRC或者SRT编辑。