Burned in Captions

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I have 2 questions about burned-in captions.  I know they are not fully accessible. 

My main question is "why".  The best answer I've found online is that the text might be fuzzy because it doesn't scale well.  Is this the main reason or is there something else?

Can an instructor use these for videos in a class?  These don't pass higher levels of accessibility standards, but are they OK enough to pass the basic threshold?  I'm asking particularly about a history of TV class where many of the video clips are from old shows.
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Suzanne Wakim

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Posted 2 months ago

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Nicolas

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Official Response
Hello Suzanne,
G93: Providing open (always visible) captions is a sufficient technique for meeting the WCAG 2.0 Success Criterion 1.2.2 Captions (Prerecorded).
As long as the captions are clear and "do not obscure or obstruct relevant information in the video", the burned-in captions are an acceptable way of making the videos accessible.
For example, if the videos are for an online course, the font for the captions should be around 12 points.  When the video is magnified by 200%, the captions should still be clear and the relevant video content not obscured or obstructed.
You may also want to review How to Produce WCAG-Compliant Video Captions and Audio Descriptions from 3Play Media.
Best regards,
Nicolás