Closed Captions (CC) are textual representations of audio content in a video, typically used to provide accessibility for deaf or hard-of-hearing individuals. They can also be used to display translations or captions in different languages. Closed captions can be turned on or off by the viewer, and are typically displayed as a transparent overlay on the video. The text in closed captions is synchronized with the audio in the video and includes information such as spoken dialogue, speaker identification, sound effects, and music descriptions.
There are several file formats that are commonly used for closed captions, including:
SRT (SubRip Subtitle) - This is a widely used, simple format that consists of a sequential list of captions, with timing information for each caption.
ASS (Advanced SubStation Alpha) - This is a more advanced format that allows for greater control over font styling, positioning, and animation.
VTT (Web Video Text Tracks) - This is a format specifically designed for use on the web and is supported by HTML5 video players.
STL (Spruce Subtitle Format) - This is a standard format used in the broadcast industry, and is often used for professional captioning services.
SCC (Scenarist Closed Captions) - This is a format used for professional captioning and subtitling in the television and film industries.
Example of an SRT file:
1
00:00:01,000 --> 00:00:04,000
Hello, welcome to the video.
2
00:00:05,000 --> 00:00:08,000
In this video, we'll be discussing closed captions.
3
00:00:09,000 --> 00:00:12,000
Closed captions provide a text representation of audio content.
Note: The first line represents the caption number, the second line represents the start and end time of the caption, and the remaining lines represent the caption text.