Quality of service statistics

Quality of service (QoS) offers a detailed view into how the video engine is performing. TVSDK provides detailed statistics about playback, buffering, and devices.

TVSDK also provides information about the following downloaded resources:

  • Playlist/manifest files
  • File fragments
  • Tracking information for files

Track at the fragment level using load information

You can read quality of service (QoS) information about downloaded resources, such as fragments and tracks, from the LoadInformation class.

  1. Implement the onLoadInformationAvailable callback event listener.

    private function onLoadInformationAvailable(event:LoadInformationEvent):void { 
        var loadInformation:LoadInformation = event.loadInformation; 
        // process the load information here     
    }
    
  2. Register the event listener, which TVSDK calls every time a fragment has downloaded.

    player.addEventListener(LoadInformationEvent.LOAD_INFORMATION_AVAILABLE,  
                                     onLoadInformationAvailable);
    
  3. Read the data of interest from the LoadInformation that is passed to the callback.

    Property Type Description
    downloadDuration

    Number

    The duration of the download in milliseconds.

    TVSDK does not differentiate between the time it took the client to connect to the server and the time it took to download the full fragment. For example, if a 10 MB segment takes 8 seconds to download, TVSDK provides that information, but does not tell you that it took 4 seconds until the first byte and another 4 seconds to download the entire fragment.

    mediaDuration

    Number

    The media duration of the downloaded fragments in milliseconds.
    size

    Number

    The size of the downloaded resource in bytes.
    trackIndex

    int

    The index of the corresponding track, if known; otherwise, 0.
    trackName

    String

    The name of the corresponding track, if known; otherwise, null.
    trackType

    String

    The type of the corresponding track, if known; otherwise, null.
    type

    String

    What TVSDK downloaded. One of the following:
    • MANIFEST - A playlist/manifest
    • FRAGMENT - A fragment
    • TRACK - A fragment associated with a specific track
    Sometimes it might not be possible to detect the type of the resource. If this occurs, FILE is returned.
    url

    String

    The URL that points to the downloaded resource.

Read QOS playback, buffering, and device statistics

You can read playback, buffering, and device statistics from the QOSProvider class.

The QOSProvider class provides various statistics, including information about buffering, bit rates, frame rates, time data, and so on.

It also provides information about the device, such as the manufacturer, model, operating system, SDK version, and screen size/density.

  1. Instantiate a media player.

  2. Create a QOSProvider object and attach it to the media player.

    // Create Media Player. 
    _mediaQosProvider = new QOSProvider; 
    _mediaQosProvider.attachMediaPlayer(_mediaPlayer);
    
  3. (Optional) Read the playback statistics.

    One solution to read playback statistics is to have a timer, that periodically fetches the new QoS values from the QOSProvider. For example:

    var qosTimer:Timer = new Timer(1000); // every 1 second  
    qosTimer.addEventListener(TimerEvent.Timer, onQoSTimer);  
    qosTimer.start(); 
    private function onQoSTimer(event:TimerEvent):void { 
        var playbackInformation:PlaybackInformation = _mediaQosProvider.getPlaybackInformation(); 
        qosInfo["Frame rate"] = playbackInformation.frameRate.toFixed();  
        qosInfo["Dropped frames"] = playbackInformation.droppedFrameCount.toFixed(); 
        qosInfo["Bitrate"] = playbackInformation.bitrate.toFixed(); 
        qosInfo["Bandwidth"] = playbackInformation.perceivedBandwidth; 
        qosInfo["Buffering time"] = playbackInformation.bufferingTime.toFixed(); 
        qosInfo["Buffer length"] = playbackInformation.bufferLength.toFixed();  
        qosInfo["Buffer time"] = playbackInformation.bufferTime.toFixed(); 
        qosInfo["Empty buffer count"] = playbackInformation.emptyBufferCount.toFixed();  
        qosInfo["Time to load"] = playbackInformation.timeToLoad.toFixed();  
        qosInfo["Time to start"] = playbackInformation.timeToStart.toFixed(); 
        qosView.update(qosInfo); 
    }
    
  4. (Optional) Read the device-specific information.

    // Show device information 
    var deviceInfo:DeviceInformation = new QOSProvider.deviceInformation; 
    qosInfo["deviceModel"] = deviceInfo.manufacturer +"-" + deviceInfo.model; 
    qosInfo["os"] = deviceInfo.os;  
    qosInfo["runtime"] = deviceInfo.runtimeVersion;  
    qosInfo["widthPixels"] = deviceInfo.widthPixels;  
    qosInfo["heightPixels"] = deviceInfo.heightPixels; 
    qosView.update(qosInfo); 
    

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