Captioning Unplugged: How Caption Encoding and Offline Captioning Works
Updated: February 10, 2021
Defining Caption Encoding
Caption encoding is a process tailored to creating closed captions for videos on devices that are primarily not connected to the internet.
Examples of devices that require caption encoding are kiosks and mobile devices, such as tablets and smartphones.
Many kiosks operate offline, and in order to make the audio accessible to deaf and hard of hearing users, they require caption encoding. And while mobile devices can connect to the internet via data and wi-fi, any videos downloaded for offline viewing require caption encoding.
Offline vs. Online Captions
Closed captions you encounter while watching online videos (such as on YouTube) exist on a separate file, or sidecar file, which the video player knows to associate with the video. Caption encoding, however, actually embeds the captions into the video file itself and does not require a video player that relies on internet connectivity such as QuickTime, or Netflix videos that are downloaded onto mobile devices.
Caption encoding is a feature 3Play Media offer users in the account system after a video file has been transcribed.
After a video has been uploaded and transcribed, users can select the option to encode the captions into the video so that a single video file with captioning functionality is produced. This file can then be downloaded into many different formats for playback on a wide variety of offline devices.
For a brief overview of how 3Play Media’s caption encoder works, watch the video below:
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