Add subtitles and closed captions - YouTube Help
You can transcribe your video and automatically line up your text with the speech in the video. A transcript contains the text of what is said in a video, but no time code information, so you need to set the timing to sync with your video. Note: Since the transcript text is automatically synchronized to your video, the transcript must be in a language supported by our speech recognition technology and in the same language that's spoken in the video. Transcripts are not recommended for videos that are over an hour long or have poor audio quality. Choose the language for the subtitles or closed captions you want to create. You can use the search bar to find languages that don't automatically show in the list. Setting the timings can take a few minutes.
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