java - 如何更改 Android 中 Exoplayer 中的音轨

Question

我有一些带有两个音轨的视频，我想在视频播放期间将音轨更改为另一种语言。

我已经尝试了一切，但仍然没有成功

这是我的代码，我正在使用 firebase 存储来存储视频。

我到处寻找但没有得到解决方案。

我的代码正在运行，仍然没有收到任何错误，但我不可能更改音轨。

public class NewVideoActivity extends AppCompatActivity {

    SimpleExoPlayerView exoPlayerView;
    SimpleExoPlayer exoPlayer;
    String videoURL;
    private ImageView selectTracksButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_new_video);

        getSupportActionBar().hide();

        selectTracksButton = findViewById(R.id.audioTrack);



        videoURL = getIntent().getStringExtra("Link");

        exoPlayerView = (SimpleExoPlayerView) findViewById(R.id.exo_player_view);
        try {


            BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
            TrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory(bandwidthMeter));
            exoPlayer = ExoPlayerFactory.newSimpleInstance(this, trackSelector);




            Uri videoURI = Uri.parse(videoURL);

            DefaultHttpDataSourceFactory dataSourceFactory = new DefaultHttpDataSourceFactory("exoplayer_video");
            ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
            MediaSource mediaSource = new ExtractorMediaSource(videoURI, dataSourceFactory, extractorsFactory, null, null);




            exoPlayerView.setPlayer(exoPlayer);

            exoPlayer.prepare(mediaSource);
            exoPlayer.setPlayWhenReady(true);


        }catch (Exception e){
            Log.e("MainAcvtivity"," exoplayer error "+ e.toString());
        }
}

Answer 1

女巫ExoPlayer 2.11.7。这段代码对我来说非常有效:

  public void setAudioTrack(int track) {
    System.out.println("setAudioTrack: "  + track);
    MappingTrackSelector.MappedTrackInfo mappedTrackInfo = Assertions.checkNotNull(trackSelector.getCurrentMappedTrackInfo());
    DefaultTrackSelector.Parameters parameters = trackSelector.getParameters();
    DefaultTrackSelector.ParametersBuilder builder = parameters.buildUpon();
    for (int rendererIndex = 0; rendererIndex < mappedTrackInfo.getRendererCount(); rendererIndex++) {
        int trackType = mappedTrackInfo.getRendererType(rendererIndex);
        if (trackType == C.TRACK_TYPE_AUDIO) {
            builder.clearSelectionOverrides(rendererIndex).setRendererDisabled(rendererIndex, false);
            int groupIndex = track -1;
            int [] tracks = {0}; 
            DefaultTrackSelector.SelectionOverride override = new DefaultTrackSelector.SelectionOverride(groupIndex,tracks);
            builder.setSelectionOverride(rendererIndex, mappedTrackInfo.getTrackGroups(rendererIndex), override);
        }
    }
    trackSelector.setParameters(builder);
    curentAudioTrack = track;
}

希望能帮到你。