Adding Text Tracks to a Video
The text tracks properties can be configured to provide captions for a video. Captions provide additional or interpretive information to individuals who wish to access it. Captions are necessary so the deaf and hard of hearing can access the audio portion of video presentations. To display captions for a video, you need to complete the following tasks:
Creating caption files
To add captions to a video, you first need to create a captions file. Web Video Text Tracks Format (WebVTT), SRT and DFXP formats are supported. The WebVTT file format (shown below) is plain text and contains time text data followed by the desired caption or subtitle text.
WEBVTT 00:00:00.000 --> 00:00:07.080 align:middle line:90% 00:00:07.080 --> 00:00:10.280 align:middle line:84% Hi, I'm Bob Bailey, a Learning Specialist with Brightcove. 00:00:10.280 --> 00:00:12.780 align:middle line:84% In this video, you'll learn about how Brightcove Campaign is 00:00:12.780 --> 00:00:14.940 align:middle line:84% organized and get a brief overview of what 00:00:14.940 --> 00:00:17.490 align:middle line:90% you can accomplish using it.
For more information on the WebVTT format, see this link. You should have a separate caption file for each language you need to support. While there are many third-party tools to help create captions files, Brightcove has several partners that provide transcription, captioning and translation services. For a complete list of Brightcove partners, visit the Partners section of our website.
Configuring the text track properties
Once the caption files have been created, they can be uploaded and hosted by Brightcove or reside at an internet accessible URL.
To view and edit the text track properties for a video, follow these steps:
- Open the Videos page.
- Click the video title link to open the video properties page.
- Locate the Text Tracks section and click Edit or double-click in the section.
- Select if the text track file will be uploaded or hosted on an external URL.
- File Upload - Click Browse and select the text track file from the file system.
- URL Upload - Enter the public URL where the text track file resides and then click Upload.
- Remote URL - Enter the public URL where the text track file resides. The URL must be less than 250 characters. Captions will be loaded from the remote URL.
- The Language field should contain the two-letter language code that specifies the language of the track text data.
- Enter the appropriate Label for the caption file. The label is displayed inside player and allows the viewer to select a language. If no label is supplied, the language code is displayed.
- Select the Kind of text track. Options include:
- Captions - Similar to subtitles, but may also include sound effects and other audio information
- Subtitles - The transcription or translation of the dialogue
- Descriptions - Intended to be a separate text file that describes the video through a screen reader
- Chapters - Intended to help the user navigate through the video
- Enter the MIME Type for the text track file. Selecting default will display the captions when the video is played.
- Check Default (Auto Display) to make the track the default. Most browsers will attempt to display the default text track first but language and accessibility settings may override the default setting.
- Click Add Text Track to save the text track information.
- Click Add Text Track to add another text track or Save to save the text tracks.
If any text tracks have been designated as the default, they will appear in bold. To delete a text track, click the delete icon () next to the text track.
When a video with captions is published, a CC button will appear on the player chrome. Click the CC button to select a caption language and display the captions.
Captions are supported on the following device types and operating systems.
- iOS 10+
- Android 7+
- Internet Explorer 11+
- The latest Chrome, Safari, and Firefox browsers on desktops
- There is no technical limit to the length of a caption, but in order for the full caption to be visible, the player must be large enough to display that much text