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Closed captioning (CC) allows the content provider to display
text overlayed on the video content thus providing additional information
about the video content to the consumers. Closed captioning is primarily
used as an accessibilty tool to show a transcription of the audio
portion of the video content as it occurs. The term “closed” in
closed captioning indicates that the captions are not made part of
the video by default. Hence, the captions have to be decoded/extracted
by an external tool. Adobe Media Server (AMS) 5.0.1 supports injecting
closed caption data into the video stream supporting the following
streaming techniques: HDS (Live and VOD)
HLS (Live and VOD)
RTMP
Closed captioning in AMS is implemented by injecting/embedding
caption data within the H264 SEI NALU as specified in ANSI/SCTE
128 2010 Section 8. Adobe Media Server supports industry standard
608/708 closed captioning for video streaming to the following output
channels/devices:
This document defines the input and output workflows, use cases,
and configurations for supporting the 608/708 closed caption data
in AMS. The closed caption data will be embedded inside the VOD
stream and can be viewed through HDS, HLS, or RTMP based subscribers.
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