• Closed Captioning

    Published on 11-08-2012 02:00 PM     Number of Views: 16193 

    Wowza Media Server™ 3.5 and later can ingest caption data from a variety of instream and file-based sources and convert it to the appropriate caption format for video on demand and live streaming using the Apple HTTP Live Streaming (Apple HLS), Adobe HTTP Dynamic Streaming (Adobe HDS), and RTMP protocols. This feature helps U.S. broadcasters to comply with the Twenty-First Century Communications and Video Accessibility Act of 2010 by providing captioning for television programs that are distributed over the Internet.

    Closed captioning for video on demand streams

    Wowza Media Server can extract 3GPP Timed Text caption data from MP4 files or from companion files that use Timed Text Markup Language (TTML), SubRip Text (SRT), Web Video Text Tracks (WebVTT), or Scenarist Closed Caption (SCC) formats to specify caption data. This caption data can be injected into Apple HLS streams as CEA-608 captions or into Adobe HDS and RTMP streams as Action Message Format (AMF) onTextData events. For more information, see the following articles:


    Note: Support for Web Video Text Tracks (WebVTT) and Scenarist Closed Caption (SCC) files was added to Wowza Media Server 3.6.

    Closed captioning for live streams

    Wowza Media Server can ingest instream closed caption information from Action Message Format (AMF) onTextData events or CEA-608 data. An Application Programming Interface (API) in Wowza Media Server enables AMF onTextData events to be injected into Adobe HDS and RTMP streams. The ingested caption data can also be delivered in Apple HLS steams as CEA-608 captions. For more information, see the following article:


    Closed captioning for Apple iOS 6 devices

    The Apple iOS 6 subtitling system uses Web Video Text Tracks (WebVTT), which provides more flexibility in rendering multiple languages and languages that aren't supported in iOS CEA-608 closed captioning. Wowza Media Server 3.6 can convert closed caption data in video on demand (VOD) and live streams to WebVTT subtitles for playback on Apple iOS 6 devices. For more information, see the following article:


    Published on 05-28-2013 10:55 AM     Number of Views: 28949 
    1. Categories:
    2. Video On Demand,
    3. Closed Captioning

    Wowza Media Server includes support for closed captioning for video-on-demand (VOD) streams. It can ingest caption data from a variety of in-stream and file-based sources and convert it to the appropriate caption format for on-demand video streaming using the Apple HTTP Live Streaming (Apple HLS), Adobe HTTP Dynamic Streaming (Adobe HDS), and RTMP protocols. ...
    Published on 11-08-2012 12:18 PM     Number of Views: 9868 
    1. Categories:
    2. Video On Demand,
    3. Closed Captioning

    A given video on demand (VOD) asset can have multiple closed captioning or subtitling language tracks associated with it. This article describes how to configure Wowza Media Server to make each of these caption language tracks available to various players. ...
    Published on 05-28-2013 02:09 PM     Number of Views: 12876 
    1. Categories:
    2. Video On Demand,
    3. Closed Captioning

    Some player technologies allow a caption file to be specified as a URL and served as a separate HTTP request to the player. This article describes how to use the HTTPProviderCaptionFile HTTP provider in Wowza Media Server to enable the server to serve pull the requested caption file from its [install-dir]/content folder and serve the file to the player. ...
    Published on 11-08-2012 02:09 PM     Number of Views: 9316 
    1. Categories:
    2. Video On Demand,
    3. Closed Captioning

    This article describes the closed captioning properties that you can adjust for video on demand (VOD) streaming in Wowza Media Server. Configuration Properties allow you to modify the default behavior of specific VOD closed captioning functionality. Debug Properties allow you to enable debug logging for specific components of the VOD closed captioning implementation. ...
    Published on 02-11-2014 03:01 PM     Number of Views: 35980 
    1. Categories:
    2. Live,
    3. Closed Captioning

    Wowza Media Server includes support for closed captioning for live streams. It can ingest caption data and convert it to the appropriate caption format for streaming using the Apple HTTP Live Streaming (Apple HLS), Adobe HTTP Dynamic Streaming (Adobe HDS), and RTMP protocols. Many player technologies, including Apple iOS devices, VideoLAN VLC player, and many set-top boxes, can display CEA-608 closed captioning data embedded in live streams. Other player technologies, such as JW Player and Flowplayer, can only display AMF onTextData captioning data. ...
    Published on 10-31-2014 05:00 PM     Number of Views: 23085 
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    Apple iOS 6 offers the ability to enable subtitles. The iOS subtitling system uses Web Video Text Tracks (WebVTT), which provides more flexibility in rendering multiple languages and languages that aren't supported in iOS CEA-608 closed captioning. This article describes how to configure Wowza Media Server software to convert closed caption data in video on demand (VOD) and live streams to WebVTT subtitles for playback on Apple iOS 6 devices. ...