Exoplayer 2 将媒体源更改为剪辑视频

Question

我正在尝试为我们的一个应用程序实现 exoplayer 2。

似乎比自动播放更复杂的文档和示例非常糟糕。

我的问题是我创建了一个媒体源并将其设置为播放器，之后我有一个自定义图标来播放视频，完成后我会回到 0。

我还有一个自定义的双搜索栏，当它移动时它会搜索到一个位置并在所选开始和结束时间之间剪辑视频。

我不确定是否可以在不重新创建整个内容的情况下更改播放器的来源。

我将我的播放器初始化为：

@AfterViews
protected void init() {
        TrackSelector trackSelector = new DefaultTrackSelector();
        mPlayer = ExoPlayerFactory.newSimpleInstance(getContext(), trackSelector);
        mVideoView.setPlayer(mPlayer);
        mPlayer.addListener(this);
}

然后我这样准备播放器：

public void setVideoPath(final String videoPath) {
        mVideoPath = videoPath;
        // Produces DataSource instances through which media data is loaded.
        DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(getContext(), Util.getUserAgent(getContext(), "yourApplicationName"));
        // This is the MediaSource representing the media to be played.
        videoSource = new ExtractorMediaSource.Factory(dataSourceFactory).createMediaSource(Uri.parse(videoPath));
        mPlayer.prepare(videoSource);
}

当我的播放图标被点击时，它会运行：

@Click(R.id.view_video_preview_container_play)
    void onPlayClicked() {
        mPlayButton.setVisibility(GONE);
        mPlayer.setPlayWhenReady(true);
}

播放完成后我会这样做：

@Override
    public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {

        if (playbackState == STATE_ENDED) {
            mPlayButton.setVisibility(VISIBLE);
            mPlayer.seekTo(0);
            mPlayer.setPlayWhenReady(false);
        }
}

当我寻求时不做：

disposable = source
                .debounce(500, TimeUnit.MILLISECONDS)
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(range -> {
                            mPlayer.stop();
                            mPlayButton.setVisibility(VISIBLE);
                            clippingSource = new ClippingMediaSource(videoSource, 2000000, 5000000);
                            mPlayer.prepare(clippingSource);
                        }
                );

现在当源发射到我的 observable 时，我回来了：

2018-11-16 12:48:16.463 28090-28209/nl.dtt.vormats E/ExoPlayerImplInternal: Source error.
    com.google.android.exoplayer2.source.ClippingMediaSource$IllegalClippingException: Illegal clipping: not seekable to start
        at com.google.android.exoplayer2.source.ClippingMediaSource$ClippingTimeline.<init>(ClippingMediaSource.java:350)
        at com.google.android.exoplayer2.source.ClippingMediaSource.refreshClippedTimeline(ClippingMediaSource.java:296)
        at com.google.android.exoplayer2.source.ClippingMediaSource.onChildSourceInfoRefreshed(ClippingMediaSource.java:262)
        at com.google.android.exoplayer2.source.ClippingMediaSource.onChildSourceInfoRefreshed(ClippingMediaSource.java:34)
        at com.google.android.exoplayer2.source.CompositeMediaSource$1.onSourceInfoRefreshed(CompositeMediaSource.java:103)
        at com.google.android.exoplayer2.source.BaseMediaSource.refreshSourceInfo(BaseMediaSource.java:73)
        at com.google.android.exoplayer2.source.ExtractorMediaSource.notifySourceInfoRefreshed(ExtractorMediaSource.java:400)
        at com.google.android.exoplayer2.source.ExtractorMediaSource.prepareSourceInternal(ExtractorMediaSource.java:348)
        at com.google.android.exoplayer2.source.BaseMediaSource.prepareSource(BaseMediaSource.java:137)
        at com.google.android.exoplayer2.source.CompositeMediaSource.prepareChildSource(CompositeMediaSource.java:109)
        at com.google.android.exoplayer2.source.ClippingMediaSource.prepareSourceInternal(ClippingMediaSource.java:216)
        at com.google.android.exoplayer2.source.BaseMediaSource.prepareSource(BaseMediaSource.java:137)
        at com.google.android.exoplayer2.ExoPlayerImplInternal.prepareInternal(ExoPlayerImplInternal.java:396)
        at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:286)
        at android.os.Handler.dispatchMessage(Handler.java:104)
        at android.os.Looper.loop(Looper.java:166)
        at android.os.HandlerThread.run(HandlerThread.java:65)

不幸的是，正如我在文档之前所说的那样，如果非常差，我却设法发现异常被抛出：

if (startUs != 0 && !window.isSeekable) {
          throw new IllegalClippingException(IllegalClippingException.REASON_NOT_SEEKABLE_TO_START);
}

特别是 window.isSeekable 是假的。

Answer 1

解决方案是重新创建 MediaSource，因为似乎无法重用相同的 MediaSource。