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Track core playback on Chromecast

This documentation covers tracking in version 2.x of the SDK. If you are implementing a 1.x version of the SDK, you can download 1.x Developers Guides here: Download SDKs
  1. Initial tracking setup
    Identify when the user triggers the intention of playback (the user clicks play and/or autoplay is on) and create a
    MediaObject
    instance.
    MediaObject
    API reference:
    mediaObject = ADBMobile.media.createMediaObject(<name>, <id>, <duration>, <streamType>, <mediaType>);
    StreamType
    constants:
    MediaType
    constants:
  2. Attach video metadata
    Optionally attach standard and/or custom video metadata objects to the video tracking session through context data variables.
    • Standard video metadata
      Attaching the standard video metadata object to the media object is optional.
    • Custom metadata
      Create a variable object for the custom variables and populate with the data for this video. For example:
      /* Set custom context data */ var customVideoMetadata = { isUserLoggedIn: "false", tvStation: "Sample TV station", programmer: "Sample programmer" };
  3. Track the intention to start playback
    To begin tracking a media session, call trackSessionStart on the
    media
    object.
    ADBMobile.media.trackSessionStart(mediaObject, customVideoMetadata);
    trackSessionStart
    tracks the user intention of playback, not the beginning of the playback. This API is used to load the video data/metadata and to estimate the time-to-start QoS metric (the time duration between
    trackSessionStart
    and
    trackPlay
    ).
    The second value is the custom video metadata object name that you created in step 2. If you are not using custom video metadata, simply send an empty object for the
    data
    argument in
    trackSessionStart
    , as shown in the commented out line in the iOS example above.
  4. Track the actual start of playback
    Identify the event from the video player for the beginning of the video playback, where the first frame of the video is rendered on the screen, and call trackPlay:
    ADBMobile.media.trackPlay();
  5. Track the completion of playback
    Identify the event from the video player for the completion of the video playback, where the user has watched the content until the end, and call trackComplete:
    ADBMobile.media.trackComplete();
  6. Track the end of the session
    Identify the event from the video player for the unloading/closing of the video playback, where the user closes the video and/or the video is completed and has been unloaded, and call trackSessionEnd:
    ADBMobile.media.trackSessionEnd();
    trackSessionEnd
    marks the end of a video tracking session. If the session was successfully watched to completion, where the user watched the content until the end, ensure that
    trackComplete
    is called before
    trackSessionEnd
    . Any other
    track*
    API call is ignored after
    trackSessionEnd
    , except for
    trackSessionStart
    for a new video tracking session.
  7. Track all possible pause scenarios
    Identify the event from the video player for video pause and call trackPause:
    ADBMobile.media.trackPause();
    Pause Scenarios
    Identify any scenario in which the Video Player will pause and make sure that
    trackPause
    is properly called. The following scenarios all require that your app call
    trackPause()
    :
    • The user explicitly hits pause in the app.
    • The player puts itself into the Pause state.
    • (
      Mobile Apps
      ) - The user puts the application into the background, but you want the app to keep the session open.
    • (
      Mobile Apps
      ) - Any type of system interrupt occurs that causes an application to be backgrounded. For example, the user receives a call, or a pop up from another application occurs, but you want the application to keep the session alive to give the user the opportunity to resume the video from the point of interruption.
  8. Identify the event from the player for video play and/or video resume from pause and call trackPlay:
    ADBMobile.media.trackPlay();
    This may be the same event source that was used in Step 4. Ensure that each
    trackPause()
    API call is paired with a following
    trackPlay()
    API call when the video playback resumes.
  • Tracking scenarios: VOD playback with no ads
  • Sample player included with the Chromecast SDK for a complete tracking example.