Скачать или смотреть How to Globally Adjust the Positioning of WebVTT Subtitles Over HTML5 Video

Learn how to lift all WebVTT subtitle cues globally over your HTML5 video without having to adjust each cue individually.
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This video is based on the question https://stackoverflow.com/q/70165634/ asked by the user 'Not My Problem' ( https://stackoverflow.com/u/9843518/ ) and on the answer https://stackoverflow.com/a/71615877/ provided by the user 'paulwen' ( https://stackoverflow.com/u/12624581/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Adjusting WebVTT Subtitle Positioning: A Comprehensive Guide

If you’re using HTML5 video and want to improve the viewing experience by positioning all your WebVTT subtitles over the video, you might be frustrated to find that customizing each individual cue can be a tedious task. The good news is that you don’t have to adjust the position cue by cue! This guide will walk you through a simple method to lift all subtitles globally instead, using a bit of JavaScript.

Understanding the Problem

Subtitles can often appear too low on the video viewport, making it hard for viewers to follow along. Instead of going through the process of manually adjusting each cue’s position in your .vtt file, it’s much more efficient to style them all at once.

What You Typically Find

Many resources suggest styling individual cues like so:

[[See Video to Reveal this Text or Code Snippet]]

While this works, it’s impractical if your subtitle file contains hundreds of cues. You need a more efficient approach to apply your styles globally.

The Solution: Using JavaScript

To globally adjust your subtitle positioning, we’ll leverage JavaScript. Here’s how to do it step-by-step:

Step 1: Add an Event Handler

You’ll start by adding an event handler to listen for when the cues change. Here is the code to accomplish this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update Cue Properties

Next, you'll create a function called onCueChange that iterates through all the cues and sets their position. For example:

[[See Video to Reveal this Text or Code Snippet]]

Complete JavaScript Code Snippet

Put everything together as displayed in the full code block below:

[[See Video to Reveal this Text or Code Snippet]]

Summary

Using JavaScript to handle subtitle positioning for all cues in your HTML5 video is a straightforward and elegant solution to the problem many face with manual cue adjustments. By adding an event listener for cuechange and modifying all cues in a single function, you ensure that subtitles are lifted and displayed correctly without making extensive alterations to each cue in your VTT files.

Now you can enhance your video viewer's experience without the headache of managing individual cues! Happy coding!