Description

Next to the default WebVTT rendering using the native browser APIs, dash.js also provides a way to use the vtt.js library to render WebVTT subtitles. This allows for more customization and control over the rendering process.

Setup

To enable custom WebVTT rendering we first need to enable the customRenderingEnabled flag in the settings:

player.updateSettings({
    streaming: {
        text: {
            webvtt: {
                customRenderingEnabled: true
            }
        }
    }
})

Next we add add an HTML <div> element as the target container for rendering the subtitles:

<video preload="auto" muted=""></video>
<div style="position: relative">
    <div id="vtt-rendering-div" style="min-width: 600px; min-height: 100px;"></div>
</div>

Now, we can attach the <div> element to the dash.js player:

let vttRenderingDiv = document.querySelector("#vtt-rendering-div");
player.attachVttRenderingDiv(vttRenderingDiv) 

Finally we need to include the vtt.js library in our HTML file. The library is part of the contrib folder of dash.js:

<script src="../../contrib/videojs-vtt.js/vtt.min.js"></script>

Example

A complete working example can be found in our sample section.