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    Automatically Generating Captions for Videos

    In this topic you will learn how to automatically generate video captions.
     

    Video Cloud Studio provides the ability to automatically generate video captions for newly uploaded or existing videos. After the caption files are generated, they are automatically configured as part of the video's text tracks properties. Brightcove recommends reviewing the generated captions for accuracy.

    In order to generate captions, the following are required:

    • The videos must have been transcoded using a Context Aware or Dynamic Delivery ingest profile
    • A video master file must be available. Videos uploaded using one of the Brightcove provided, standard ingest profiles will save a master by default. For more information on archiving masters, see the Archiving Masters document.

    If you are using a third-party to generate caption files, see Adding Captions to Videos using the Media Module for information on how to associate caption files with videos.

    Generating captions when uploading videos

    The Upload module provides an option to generate caption files when videos are uploaded. To generate a caption file during upload, follow these steps.

    1. Click Upload in the navigation header to open the Upload module.
    2. Enable the Auto captioning option, the Automatic captioning settings dialog will open.
    3. Select the Language spoken in the video(s). If a Language is not selected, the video language is auto-detected. Selecting a language will improve the caption file generation time and may improve overall accuracy.
    4. Enter a Label. The label is typically set to the language used in the video. The label will be displayed in the CC dropdown in the video player and will be used by viewers to select the captions to be displayed.
    5. Click Done.

    Generating captions for an existing video

    The Media module provides the option to generate caption files for existing videos in your account. To generate a caption file for an existing video, follow these steps.

    1. Click Media in the navigation header to open the Media module.
    2. Click the link for the video you want to edit to open the video properties.
    3. Locate the Text Tracks section and click Edit.
    4. Select the Auto caption option.
    5. Select the Language spoken in the video. If a Language is not selected, the video language is auto-detected. Selecting a language will improve the caption file generation time and may improve overall accuracy.
    6. Enter a Label. The label is typically set to the language used in the video. The label will be displayed in the CC dropdown in the video player and will be used by viewers to select the captions to be displayed.
    7. Click Add Text Track.

    The caption generation process will begin. When complete, a message will be displayed.

    Generating captions for multiple videos

    The Media module also provides the option to generate caption files for multiple videos at once. A maximum of 100 videos can be captioned at once. To generate a caption files for multiple videos, follow these steps.

    1. Click Media in the navigation header to open the Media module.
    2. Select the check box next to the videos you want to generate captions for.
    3. Click More > Auto caption.

    Reviewing caption files

    After the caption files are generated, they are automatically configured as part of the video's text tracks properties. Captions will appear immediately during video playback. If you would like to review the captions before they appear, there are two options:

    • Deactivate the video - Videos that are deactivated will not play. Review the captions and when they are approved, activate the video.
    • Change the text tracks Kind property - Edit the text tracks property for the video and set the Kind to metadata. Text tracks with a Kind of metadata are not displayed to the viewer. Review the captions and when they are approved, set the Kind back to captions.

    Downloading caption files

    Chances are the caption generation process will not be perfect and you may need to edit names used in the video and/or punctuation. The Media module provides the ability to download caption files. To download a caption file, follow these steps.

    1. Click Media in the navigation header to open the Media module.
    2. Click the link for the video you want to edit.
    3. Locate the Text Tracks section and click Edit.
    4. Click the download icon () in the Actions column to download the caption file.

    The caption file is a formatted WEBVTT file and can be edited using any text editor. Once the changes are made, delete the existing caption file by clicking on the delete icon () in the Actions column. The edited caption file can then be uploaded. For information on how to upload a new text tracks file, see Configuring the text track properties.

    Supported languages

    Currently, auto captions are limited to the following languages

    • Australian English (en-AU)
    • Brazilian Portuguese (pt-BR)
    • British English (en-GB)
    • Canadian French (fr-CA)
    • Dutch (nl-NL)
    • Farsi Persian (fa-IR)
    • French (fr-FR)
    • German (de-DE)
    • Gulf Arabic (ar-AE)
    • Hebrew (he-IL)
    • Indian English (en-IN)
    • Indian Hindi (hi-IN)
    • Indonesian (id-ID)
    • Irish English (en-IE)
    • Italian (it-IT)
    • Japanese (ja-JP)
    • Korean (ko-KR)
    • Malay (ms-MY)
    • Mandarin Chinese – Mainland (zh-CN)
    • Modern Standard Arabic (ar-SA)
    • Portuguese (pt-PT)
    • Russian (ru-RU)
    • Scottish English (en-AB)
    • Spanish (es-ES)
    • Swiss German (de-CH)
    • Tamil (ta-IN)
    • Telugu (te-IN)
    • Turkish (tr-TR)
    • US English (en-US)
    • US Spanish (es-US)
    • Welsh English (en-WL)

    Page last updated on 27 Sep 2021