Use case
YouTube Live Translation & Real-Time Subtitles
Follow a YouTube Live stream with bilingual captions generated from the tab audio, then save, edit and export the transcript as subtitle files.
The next demo starts in a few seconds.
下一个演示将在几秒后开始。
TanLens
Live tab captions
Source language
Translate to
Audio translation: available now
Captures the YouTube Live tab audio and produces source text plus a live translation.
Comments and live chat: not supported yet
The current build does not read comments, gifts, or on-screen text. That needs a separate page-content integration for each platform.
TanLens generates live bilingual captions for a YouTube Live stream that plays in Chrome or Edge. It reads the stream’s audio from the tab, transcribes the speech, and translates it into your language. YouTube’s own captions depend on the creator, so TanLens is useful when none are provided or when you need a language the stream does not offer.
01Works with the player, not the YouTube API
Open the live watch page in Chrome or Edge, start the stream, then capture that tab from the TanLens extension. Because the audio comes from the player, the same approach works for premieres, live replays and embedded players on other sites. TanLens does not download the video, read the chat, or call YouTube’s caption API. It only hears what your speakers would hear, which also means music and sound effects can make speech recognition harder during intros and transitions.
02What you can do with the transcript
Save the transcript when the stream ends, then edit the parts that matter for your notes. A bilingual SRT is handy if you plan to clip the stream later, while VTT fits a web player and TXT is enough for a summary. The current HTTP path collects a two-second audio chunk before speech recognition and translation begin; network and provider time are added after that. Expect longer waits when the stream buffers or the speaker changes language mid-sentence.
Frequently asked questions
Related pages
Put words on the screen tonight
Twenty free minutes a month, no card, no meeting bot. Start with your microphone, then add the extension for tab audio.