CEA-608 closed captions
An industry-standard format for delivering onscreen text synchronized to the audio or video of a video program. Originally developed for hearing-impaired viewers, CEA-608 closed captions (also known as Line 21 text) are frequently used on televisions in loud environments (such as bars and airports). CEA-608 closed captions, which use the .scc filename extension, offer numerous formatting options. Viewers can turn closed captions on or off while watching television shows, movies, web videos, and other programs. YouTube and Vimeo videos support CEA-608 closed captions. In Compressor, CEA-608 closed captions are compatible with iTunes Store packages, the YouTube and Vimeo destinations, and many transcode settings.