exoplayer 纯java,Exoplayer不播放任何视频

让Exoplayer工作有问题 . 我设法从网址加载视频 . 但它只播放音频 . 所以我做错了什么 .

BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();

TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveVideoTrackSelection.Factory(bandwidthMeter);

TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

LoadControl loadControl = new DefaultLoadControl();

SimpleExoPlayer exoPlayer = ExoPlayerFactory.newSimpleInstance(simpleExoPlayerView.getContext(), trackSelector, loadControl);

Uri mp4VideoUri = Uri.parse(videoUri);

DefaultHttpDataSourceFactory dataSourceFactory = new DefaultHttpDataSourceFactory("ExoPlayerDemo");

ExtractorsFactory extractor = new DefaultExtractorsFactory();

MediaSource videoSource = new ExtractorMediaSource(mp4VideoUri, dataSourceFactory, extractor, null, null);

exoPlayer.prepare(videoSource);

exoPlayer.setPlayWhenReady(true);

这就是我只能播放音频的方式 . 不知道我应该改变什么 .

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