What are live AI speech translations?

Clevercast lets you deliver live streams with multiple audio languages and closed captions. You can use AI, human interpreters and subtitlers, or a combination of both.

We offer live AI speech translations as a low-cost alternative to multilingual broadcasts and remote simultaneous interpretation (RSI). You can use this to add simultaneous translations to your live stream without any effort, fully automatic. Or you can set an AI vocabulary and make real-time corrections to increase the translation quality.

Our speech translations, like our closed captions, offer superior quality compared to other live AI solutions. Because Clevercast slightly increases the HLS latency of the live stream, it can provide the AI engine with complete sentences to recognize and translate. Language models work much more accurately when they have sufficient context.


  • Easy to use: requires no effort to add the extra languages to the live stream and video player.
  • Natural sounding voices: the AI voices are clear and almost human.
  • Customizable: for each language, you can choose a male or female speaker. For some languages, you can also choose the regional accent.
  • Cost-effective: a large number of translations are possible, without having to hire human interpreters for each language.
  • Flexible: it is possible to have both human and AI translations for different languages.
  • Accessible: live speech translations and multilingual closed captions can be combined.
  • Reliable: we use Akamai’s global CDN and adaptive bitrate delivery for flawless HD streaming.

How to use

Configuration is straightforward. Simply add the AI interpreter languages to your live event, and Clevercast will do the rest. When you embed our player, viewers can automatically select these languages.

If you have some time to spare, we recommend creating an AI vocabulary with the key terms for the live stream (names, acronyms, jargon). The setup is easy and can be updated before and during the live stream. You can export vocabularies and reuse them in other live streams.

To improve accuracy, you can have someone make real-time corrections to the speech-to-text transcription, which is the source of the AI translations. Clevercast immediately adds such corrections to the AI vocabulary, so each term only needs to be corrected once. Alternatively, you may also consider hiring professional correctors.

When to use

Budget considerations often influence the decision to use live AI speech translations. For example, if there isn’t enough budget to hire human interpreters for all languages, or if the live stream is so lengthy that hiring human interpreters becomes very expensive. This way, AI simultaneous interpretation is gaining ground.

Additionally, AI speech translations are frequently used to enhance live streams with multilingual closed captions. If closed captions are already available for a language, speech translations can be added at no additional cost.

Live AI speech translations vs. closed captions

In our view, AI is usually the best solution for live (multilingual) closed captions. While the textual translations used to generate AI voices are very accurate, our assessment is slightly different for live speech translations (at present). This is because in speech translation, additional factors such as sentence segmentation, fluency and intonation need to be taken into account.

For speeches with well-structured sentences, AI text to speech conversion works effectively. However, when speakers often hesitate or search for words, AI may struggle to properly delineate sentences. This can make spoken sentences harder to understand compared to reading subtitles. Note: to address this issue, a real-time corrector can ensure proper sentence structure in the translation source. Also keep in mind that AI capabilities, including simultaneous interpretation, are advancing rapidly.

So the content of your live stream matters when deciding whether to use live AI speech translations. If necessary, ask for a free trial account to test similar content in advance. Of course, you can always combine closed captions and audio translations, at no extra cost.