syllabes.js is a JavaScript library that can parse multiple types of subtitles or lyrics, so you can use them in your application the same way no matter their file format.

Here's how you could use it :

• Display subtitles on a video with a custom style
• Act as a polyfill for browser that doesn't understand WebVTT
• Scroll the lyrics of a song like a karaoke

Useful links :

• How to contribute
• NPM homepage

syllabes.js is proudly written in TypeScript, and is available under the MIT license.

Installation

Download the library using one of these ways :

• Clone this git repository
• npm install syllabesjs
• Download the development version or the production-ready minifed file.

Supported file formats

• Ultrastar (.txt) : Used by a PC karaoke game. Contains song metadata and lyrics for one or two people, with syllable precision.
• SubRip (.srt) : Simple subtitles format for videos. Contains sentences with optional formatting and on-screen positioning.
• Sub Station Alpha, Advanced SSA (.ssa, .ass) : Powerful subtitles format for videos. Contains sentences with optional metadata, formatting, styling and on-screen positioning.
• WebVTT (.vtt) : W3C standard to display subtitles on HTML5 videos. Contains sentences with optional formating, on-screen positioning, multiple voices and syllable precision.

Feature	Ultrastar	SubRip	SSA / ASS	WebVTT
Sentences	✔	✔	✘	✔
Syllables	✔	-	-	✘
Metadata	✔	-	✘	✘
Multiple tracks	✔	-	-	-
On-screen positioning	-	✔	✘	✘
Voice indicators	-	-	-	✘
Text formating	-	✔	✘	✘
Text styling	-	-	✘	✘

Legend :

• ✔ : Supported by the format
• ✘ : Supported by the format but not implemented yet in syllabes.js
• - : Not supported by the format

Usage

Start by instanciating the library.

var sy = new Syllabes();

Then, call the parse method of the library with the file format and its content.

var parsed = sy.parse('webvtt', '[... file content here ...]');

It also accepts an optional options object to influence the parsing.

var config = {
    syllable_precision: false  
};
var parsed = sy.parse('ultrastar', '[... file content here ...]', config);

Don't forget to check the demonstration page in the demo/ folder.

Output examples

Sentence object taken from the output of a parsed Ultrastar file :

{
    id: 1,
    syllables: [
        {
            start: 15650,
            end: 15950,
            duration: 300,
            pitch: 11,
            text: "Rah!",
            type: "freestyle"
        },
        {
            start: 17350,
            end: 17750,
            duration: 400,
            pitch: 11,
            text: " Ah...",
            type: "freestyle"
        }
    ]
}

Sentence object taken from the output of a parsed SubRip file :

{
    id: 1,
    start: 15650,
    end: 17750,
    duration: 2100,
    text: "Rah! Ah..."
}

The output can also include various metadata if the file format permits it.

Building

1. Clone the git repository
2. While in the project repository, execute npm install
3. Execute gulp watch so it compiles the source code as you edit it
4. Execute gulp build to build all the source code
5. Execute gulp minify to make a minifed version of the library

Background

At first, syllabes.js was just a bunch of code written for a school project, where we needed to display a song's lyrics in a karaoke-style (so syllable per syllable).

Seeing that there wasn't viable solutions to parse Ultrastar (an open-source Singstar clone) lyrics files in JavaScript, we decided to make our own parser using the few existing specifications of the format.

Seeing that the code worked quite well, I decided to release it in the wild while making enhancements and other files support easy.