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A11y: Ensure all course videos support closed captions and interactive transcripts #3928

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@pradeep0153

Description

The current video player lacks proper support for standard VTT (Video Text Tracks) files, severely violating accessibility standards for hearing-impaired students and those learning in non-native languages.

Proposed Solution

  • Upgrade the video player to parse and display .vtt subtitle files dynamically.
  • Add a standard "CC" button to the control bar allowing users to toggle captions and select languages.
  • As a stretch goal, implement a scrolling transcript component beside the video that highlights the current spoken sentence and allows users to click a paragraph to instantly seek the video to that timestamp.

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