The captions are created using Google’s speech recognition technology, and while the quality is variable, video owners can download the caption files and edit them. Caption files can also be also be translated into 50 other languages.
In March this year, YouTube began rolling out automatic captioning to all the English language videos it hosts. Video owners can speed up the process by clicking on a ‘request processing’ button.
YouTube is planning to expand automatic captions to other languages. For more information, see the GigaOM website.
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