(CC) Closed Captions

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.

(VOD) Video On Demand
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(SVOD) Subscription Video on Demand
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(WEBRTC) Web Real-Time Communication
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(AVOD) Advertising Video On Demand
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(TVOD) Transactional Video On Demand
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(PPV) Pay Per View
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(AAMP) Advanced Adaptive Media Player
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(DVR) Digital Video Recorder
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(PTS) Presentation timestamp
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(HLS) HTTP Live Streaming
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(DRM) Digital rights management
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(MT) MediaTailor
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(HDCP) High-bandwidth Digital Content Protection
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(VMAP) Video Multiple Ad Playlist
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(MSE) Media Source Extension
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(EME) Encrypted Media Extension
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(VAST) Video Ad Serving Template
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(SSAI) Server-Side Ad Insertion
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(CSAI) Client Side Ad Insertion
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(OTT) Over The Top
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(UHD) Ultra high definition
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(HDR) High dynamic range
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(HDRR) High Dynamic Range Rendering
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(AAC) Advanced Audio Coding
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(AC-3) Audio Codec 3
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(CDN) Content Delivery Network
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(CC) Closed Captions
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(CRTP) Compressed Real Time Transport Protocol
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(DOF) Depth of Field
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(HD) High Definition
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(P-FRAMES) Predictive Frames
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(RTMP) Real Time Messaging Protocol
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(RTSP) Real Time Streaming Protocol
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(SRT) SubRip Subtitle File
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(WEBVTT) Web Video Text Tracks
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(OBS) Open Broadcaster Software
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(KPI) key performance indicator
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(DASH) Dynamic Adaptive Streaming over HTTP
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(DAI) Dynamic ad insertion
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(VPAID) Video Player-Ad Interface Definition
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(MP3) MPEG-1 Audio Layer 3
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(ISOBMFF) ISO Base Media File Format
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(MOOV) Movie Metadata Box
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(MOOF) Movie Fragment Box
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(MDAT) Media Data Box
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(OTA) Over-the-air programming
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(TPM) Technological Protection Measures
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(DMCA) Digital Millennium Copyright Act
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(ISO) International Organization for Standardization
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(HEVC) High Efficiency Video Coding
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(CMAF) Common Media Application Format
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(FAAC) Freeware Advanced Audio Coder
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(SDR) Standard Dynamic Range
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(SD) Standard Definition
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(ABR) Adaptive Bitrate
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(DCR) Digital Content Ratings
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(PVOD) Premium video on demand
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(NVOD) Near video on demand
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(UGC) User-Generated Content
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(ATV) Advanced TV
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(CAF) Cast Application Framework
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(GPU) Graphics processing unit
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(CPU) Central processing unit
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(CSI) Camera Serial Interface
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(MSS) Microsoft Smooth Streaming
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(TRAF) Track Fragment Box
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(STYP) Segment Type Box
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(TFDT) Track Fragment Decode Time
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(SMPTE) Society of Motion Picture and Television Engineers
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(VMAF) Video Multimethod Assessment Fusion
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(PSNR) Peak signal-to-noise ratio
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(TEE) Trusted execution environment
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(VBR) Variable bitrate
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(CDM) Content Decryption Module
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(IPTV) Internet Protocol Television
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(P2P) Peer-to-Peer
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(DMA) Designated Market Area
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