Amara is a free web-based service that allows anyone to easily sub-title and add captions to any video.
As long as you have a URL of a published video, Amara makes it very easy to caption it. The clip may be on a video sharing site or embedded in custom video player and Amara can still get to it.
Amara is made up of three main parts:
a) A subtitle creation and viewing tool (aka the widget)
b) A collaborative subtitling website
c) An open protocol for subtitle search/delivery
All tools inside Amara are free and open-source.
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