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Why do the captions on CC2 or CC4 appear later than intended?

April 26, 2017appear captions cc2 cc4 later

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Why do the captions on CC2 or CC4 appear later than intended?

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CC2 and CC4 share bandwidth with CC1 and CC3 respectively, and CC1 and CC3 receive priority when there is not enough bandwidth to encode both caption streams. As a result, the captions in CC2 or CC4 may be delayed until a point at which there is sufficient bandwidth remaining to encode them.