Load higher quality smooth streaming bitrate on start

问题

Is it possible to adjust the way in which smooth streaming xap bitrate is first started? As it is right now, the player shows a low quality stream until is has buffered the higher quality. Can I change this to allow for the higher quality on start? If so, how?

(I've already seen this question, but I am not using the media platform player.)

IIS Smooth streaming low quality on start

回答1:

The answer on you link answers your question. All that you need is to replace the plugin by properties and events of the SmoothStreamingMediaElement class.

Though I don't like that implementation and msdn has a better example Select and Monitor Bitrate

So in order to set the quality above average use this code:

public MainPage()
{
    InitializeComponent();
    mediaElement.ManifestReady += OnManifestReady;
}

void OnManifestReady(object sender, EventArgs e)
{
    foreach (SegmentInfo segment in mediaElement.ManifestInfo.Segments)
    {
        var videoStream = segment.AvailableStreams.First(i => i.Type == MediaStreamType.Video);
        var averageBitrate = videoStream.AvailableTracks.Average(t => (double)t.Bitrate); // you can use Max as well

        var allowedTracks = videoStream.AvailableTracks.Where(ti => ti.Bitrate >= averageBitrate).ToList();
        videoStream.SelectTracks(allowedTracks, false);
    }
}

来源：https://stackoverflow.com/questions/19380959/load-higher-quality-smooth-streaming-bitrate-on-start