Learn what are the closed caption services. Understand what are closed captions services and their differences from subtitles and open captions.

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2. These are the dedicated services offering time-synchronized text
reflecting on an audio track while watching the visual content. The
dedicated process of closed captioning covers transcribing the audio to
text and dividing it into different chunks called caption frames.
These caption frames are then synchronized with the video. These
captions usually appear at the bottom center of the video.
Captions are created while considering that the viewer is not capable of
hearing the audio or video at all. Hence, it covers the transcription of
spoken dialogues, relevant sound effects, non-speech elements, and
speaker identifications.

3. Firstly, the transcript is not synchronized with the
media file. It suits the requirements of audio-only
content like a podcast or other promotional
content. Transcripts lack the usage in video or
presentations.
Closed captions work best for the presentations
and videos. Hence, these are synchronized with
the video for detailed understanding.

4. Difference between the closed captions and live captions
Live captions or real-time captions are created and transmitted in real-time using
expert stenographers during the live events. The closed captions, on the other hand,
are attached to the videos and are created once the event has taken place.
Difference between the closed captions and open captions
Open captions are directly burned to the videos and cannot be turned off. These are
found on the open kiosks. The closed captions, on the other hand, are common for
online videos. The closed captions allow the viewers to toggle the captions on and off
which gives complete control to the viewers.

5. The popular formats used in the closed captions are:
• RT for real media
• CPT.XML for captioning
• STL for DVD encoding
• QT for QuickTime or QuickText
• SAMI for Microsoft or Windows Media
• WebVTT for HTML5
• SRT for YouTube and web media
• DFXP for Flash players
• EBU.STL for PAL Broadcast
• CAP for Broadcast
• SMPE-TT for web media
• SCC for broadcast, web media, and broadcast

6. So, it is easy to understand closed caption
services in detail. These are different from the
basic concepts of subtitles and open captions.
Professional caption experts use the different
formats for the closed caption according to
the specific content types for the different
clients.
Close captions ensure that the content can be
consumed by a wide audience without any
accessibility issues or other barriers.

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