![]() ![]() But not any text, we want to turn our audio into a WebVTT file with accurate timestamps. Video (automatically or manually), read that audio and turn it into text. The goal is to extract audio content from a In this blog post we are going to review some speech-to-text solutions that can work with our player (or any HTML5 video player). Getting there though may not be as straight forward as one may think. & more) and we frequently test our player on screen readers and other assistive technologies. Radiant Media Player supports a large array of accessibility features (keyboard navigation, closed captions, interactive transcript Making your video content accessible is an important step to take when building a video application or platform. If the video can playType and can play MP4 video if(v.Tweet Making your video content accessible Create an empty video element var v = document.createElement( 'video') It will not load the code for a polyfill like the Modernizr example. The code below uses plain JavaScript to test if a browser supports HTML5 video by creating an empty video element and testing for the video’s canPlayType property. Load the corresponding assetts for the polyfill you want to use // in this case we are using the playr polyfill One way to ensure that we only load our polyfill if the browser doesn’t support tracks natively is to use Modernizr.load to conditionally load Playr’s CSS and JavaScript when the browser does not support HTML5 video tag natively. The downside is 2 more files (one CSS and one JavaScript) to download for the video page but until VTT is widely supported the extra files are worth the effort to create accessible content. Playr seems to be the most feature complete polyfill for HTML5 video tracks. I will use one of the many polyfils available for HTML5 Video Tracks. Feature enabled by default in nightly builds.See the Mozilla Developer Documentation for more information.Browser supportīased on Silvia Pfeiffer’s post to the VTT community group dated August, 2012, and updated with new information about Firefox, the following browsers support VTT tracks for video and audio: Browser ![]() This also means that creating VTT files requires nothing more than a text editor although there are more specialized tools to create the captions. WebVTT files provide open captions, independent of the audio or video files they are attached to, they are not “hard coded” into pixels. Both YouTube and Google search can report results based on the video captions available for a given file. Google indexes the content of our captions. We can enable captions when the ambient noise is too loud to listen to a recorded presentation, we can use chapters to navigate through a long lecture video just like DVD or Blue Ray movies.Ĭaptions can also improve our movies’ discoverability. It is a time-indexed file format and it is referenced by HTML5 video and audio elements.Īs with many assistive technologies, it would be a mistake to assume that they are only meant as a way to provide for accessibility accomodations. WebVTT (Web Video Text Tracks), formerly known as WebSRT, is a W3C community proposal for synchronized video caption playback. ![]()
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