![]() Unlike captions, subtitles do not include the non-speech elements of the audio (like sounds or speaker identifications). Their purpose is to translate the spoken audio into the viewer’s language. Subtitles, on the other hand, are for hearing viewers who don’t understand the language of the audio. They are often dictated with a CC icon on video players and remotes. There’s a big difference between closed captioning vs subtitles, even though they are often used interchangeably.Ĭlosed captions assume the viewer cannot hear. But how are they different from subtitles? And how are subtitles different from Subtitles for the Deaf and Hard of Hearing? Types of Closed Captionsīy now, you know what captions are. While the text within a closed caption file is comprised predominantly of speech, captions also include non-speech elements like speaker IDs and sound effects that are critical to understanding the plot of the video.Ĭlosed captions are usually noted on a video player with a CC icon. They make video accessible to deaf and hard of hearing by providing a time-to-text track as a supplement to, or as a substitute for, the audio. What Is Closed Captioning?Ĭlosed captions are a textual representation of the audio within a media file. Like a waterfall effect, captions started to appear on television, and by the turn of the century, closed captions had become a legal mandate for television. Later that year, captions were debuted for the first time to the public on Julia Child’s show, “The French Chef.” In 1972, at Gallaudet University, ABC and the National Bureau of Standards presented the technology necessary to make television accessible with captions. Without captioning, the 360 million people with hearing loss around the world would be unable to comprehend and engage with your video content. More video content is being uploaded to the web in 1 month than TV has created in 3 decades.Ĭlosed captions are key players in video accessibility. With the massive proliferation of online video content, it’s become more important to make online video accessible. Over 5% of the world’s population has disabling hearing loss. Whether you already caption, aren’t sure if you need to caption, or are completely new to captioning, you’ll find something to learn in this guide. US and International Accessibility Laws.8 Benefits of Transcribing and Captioning Online Video.21st Century Communications and Video Accessibility Act.Greater Flexibility for Viewing Content.How to Get Buy-In for Closed Captioning.Deep Dive: SRT and WebVTT Closed Caption File Formats.An Overview of All the Closed Caption Formats. ![]() Creating Closed Captions Manually or with ASR.Independent cropping, aspect ratio, color format, resolution, frame rate, de-interlacing and color adjustment settings for each individual stream Enables multiple output streams without the need for additional physical input channels thus reducing hardware requirements. ![]() Up to 5 capture streams for any one physical input channel. VBI data available through DirectShow VBI pin on Video Device Capture filter. ![]() Text overlay (only available through SDK) Scaling, Cropping, Frame, Rate ConversionĬaptions can be rendered directly onto the capture or preview video (Both NTSC, PAL, and digital captions)ĭecoded CC available through the DirectShow CC pin on the Video Device Capture Filter. DirectShow provides three filters under the classification “WDM Streaming VBI Codecs” that will decode data from VBI pins:īoth CEA-608 and CEA708 specifications are supportedĬan be delivered as Line-21 Byte Pair or as Line-21 GOP PacketĬC data available through DirectShow VBI pin on Video Device Capture filter. The driver delivers VBI data as raw waveforms, which are then decoded by external DirectShow filters. In PAL, World Standard Teletext (WST) is encoded in the VBI data region. In NTSC, line 21 Closed Captioning (although it is part of the video interval rather than true VBI data), is commonly treated as VBI data. VBI data includes Vertical Interval Timecode (VITC) in both the NTSC and PAL worlds. Multiple Osprey cards can be plugged into one systemĭirectShow-compatible VBI pins are provided on the Video Device Capture Filter. Unified driver (common driver for all Analog PCIe series cards)
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