LRC转SRT - 技术栈

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

javascript 复制代码

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。

javascript 复制代码

<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(/&#39;/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。