Question

我在Android应用中使用Exoplayer库来播放一些实时HLS视频（.m3u8格式）。版本是2.8.4。我需要使用户可以在观看视频时更改实时流的视频质量。

为此，我使用followng方法（我来自exoplayer示例项目）：

Pair<AlertDialog, TrackSelectionView> dialogPair = TrackSelectionView.getDialog(this, title, trackSelector, rendererIndex);
    dialogPair.second.setShowDisableOption(true);
    dialogPair.second.setAllowAdaptiveSelections(allowAdaptiveSelections);
    dialogPair.first.show();

当我选择某种视频质量时，我看到了这种新质量，但是exoplayer经常在几秒钟之后（有时非常频繁）在Player.EventListener方法中的onPlayerError(ExoPlaybackException error)中引发错误。 ExoPlaybackException始终具有TYPE_SOURCE和空消息。而且我还注意到，当我看到自动质量的实时视频时，当我的互联网连接断开时，它的质量并没有降低，我发现TYPE_SOURCE出现相同的exoplayer错误。

这是我初始化播放器的代码：

    bandwidthMeter = new DefaultBandwidthMeter();
    AdaptiveTrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
    trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

    player = ExoPlayerFactory.newSimpleInstance(
            new DefaultRenderersFactory(getActivity()),
            trackSelector,
            new DefaultLoadControl());
    exoPlayerOnline.setPlayer(player);
    MediaSource mediaSource = buildMediaSource(Uri.parse(videoStreamUrl));  
    player.prepare(mediaSource, true, false);
    player.setPlayWhenReady(playWhenReady);

和方法buildMediaSource()：

private MediaSource buildMediaSource(Uri uri) {
        DefaultHttpDataSourceFactory httpDataSourceFactory = new DefaultHttpDataSourceFactory(userAgent,
                bandwidthMeter,
                20 * 1000,
                20 * 1000,
                true);
        DefaultDataSourceFactory defaultDataSourceFactory = new DefaultDataSourceFactory(getActivity(),
                bandwidthMeter,
                httpDataSourceFactory);
        OkHttpDataSourceFactory okHttpDataSourceFactory = new OkHttpDataSourceFactory(okHttpClient,
                userAgent,
                bandwidthMeter);

    int type = Util.inferContentType(uri);
    switch (type) {
        case C.TYPE_SS:
            return new SsMediaSource.Factory(new DefaultSsChunkSource.Factory(defaultDataSourceFactory), okHttpDataSourceFactory)
                    .createMediaSource(uri);
        case C.TYPE_DASH:
            return new DashMediaSource.Factory(new DefaultDashChunkSource.Factory(defaultDataSourceFactory), okHttpDataSourceFactory)
                    .createMediaSource(uri);
        case C.TYPE_HLS:
            return new HlsMediaSource.Factory(okHttpDataSourceFactory)
                    .createMediaSource(uri);
        case C.TYPE_OTHER:
            return new ExtractorMediaSource.Factory(okHttpDataSourceFactory)
                    .createMediaSource(uri);
        default:
            Toast.makeText(getActivity(), "Unsupported video type", Toast.LENGTH_LONG).show();
            return null;
    }
}

那么，请帮助我，如何解决这个问题？

更改视频质量后，ExoPlayer在EventListener中调用onPlayerError方法

0 个答案: