Captions are essential for those who cannot hear or have difficulty hearing the audio. They also help non-native English speakers who may find reading easier to comprehend. Video search results with captions also rank higher than those without captions (auto-captions do not get indexed by Google and therefore do not help Search Engine Optimization).
Vimeo doesn't supply auto-captions, so you'll need to add captions to your video in Vimeo.
There are many benefits to your users and your website when videos are captioned.
- Broaden audience segment: Captions added to video widen your audience segment because they make your video universally accessible.
- Increased view times: Studies have shown that captions increase view times not only for persons with deafness or a hearing impediment or those for which English is a second language, but also for users who watch video in a sound sensitive environment (e.g. a workplace or library).
- Improved Search Engine Optimization (SEO): Caption text is indexed by search engines, so it's important to consider keywords when producing the spoken content for your video(s). Note that auto-captions do not get indexed by Google and therefore do not help Search Engine Optimization.