Android - ExoPlayer 在没有太多缓冲的情况下尽快开始播放

Question

我正在使用一个简单的 exoplayer 测试代码从 URL 播放视频，我注意到在播放器连接后，它会缓冲大约 2-3 秒直到开始播放（我指的是大约 2-3 秒，因为我不知道确切它内部是如何工作的，它可能是一定数量的字节）。考虑到连接大约需要 1-2 秒（然后开始缓冲，然后有效地启动视频），启动视频大约需要 4 秒，这似乎太多了。我使用速度测试应用程序在检测到的速度约 24Mbits/s 的连接上测试了 3 秒视频，640x480，1.23MB 大小）。

有没有办法加快视频的启动速度（例如，通过设置启动所需的初始缓冲大小）？

这是我的测试代码：

TrackSelector trackSelector = new DefaultTrackSelector();
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);

PlayerView playerView = findViewById(R.id.player_view);
playerView.setPlayer(player);
DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this,
            Util.getUserAgent(this, "simpleAudioApp"));
dataSourceFactory = new CacheDataSourceFactory(getSimpleCacheInstance(),
            dataSourceFactory);

Uri audioSourceUri = Uri.parse("http://...somevideo.mp4");
MediaSource audioSource = new ExtractorMediaSource.Factory(dataSourceFactory)
            .createMediaSource(audioSourceUri);
LoopingMediaSource loopingSource = new LoopingMediaSource(audioSource, 1);

// Prepare the player with the source.
player.prepare(loopingSource);
player.setPlayWhenReady(true);
player.addListener(new Player.EventListener() {
        @Override
        public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
            if (playbackState == Player.STATE_ENDED) {
                Toast.makeText(TestActivity2.this, "Video ended", Toast.LENGTH_LONG).show();
            }
            else {
                Toast.makeText(TestActivity2.this, "video state chnged: " + playbackState, Toast.LENGTH_LONG).show();
            }
        }

        @Override
        public void onRepeatModeChanged(int repeatMode) {
            Toast.makeText(TestActivity2.this, "repeat chnged: " + repeatMode, Toast.LENGTH_LONG).show();
        }
    });

有没有办法实现这一目标？

Answer 1

您可以使用自定义负载控制

DefaultLoadControl loadControl = new DefaultLoadControl.Builder().setBufferDurationsMs( minBufferMS, maxBufferMs, bufferForPlayackMS, bufferForPlaybackAfterRebufferMs ).createDefaultLoadControl();

TrackSelector trackSelector = new DefaultTrackSelector();

DefaultLoadControl loadControl = new DefaultLoadControl.Builder().setBufferDurationsMs(32*1024, 64*1024, 1024, 1024).createDefaultLoadControl();
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);