ExoPlayer - 在SD卡中播放本地mp4文件

时间：2016-02-27 20:32:21

标签： java android android-sdcard exoplayer

我正在使用Exoplayer演示应用，并希望从SD卡预加载MP4视频。 我已经尝试了this post的实现，但它不起作用。在我的exoplayer Demo中没有名为DemoUtil.java的类。 改为使用：

public static final Sample[] LOCAL_VIDEOS = new Sample[] {
new Sample("Some User friendly name of video 1",
"/mnt/sdcard/video1.mp4", Util.TYPE_OTHER),
};

我也无法使用他们为SampleChooserActivity.java提到的代码片段。 （保持给我错误）

我改为使用：

group = new SampleGroup("Local Videos");
group.addAll(Samples.LOCAL_VIDEOS);
sampleGroups.add(group);

我做错了什么？每个设备的文件路径是否都会更改？

9 个答案:

答案 0 :(得分：19)

Haven没有尝试过演示应用程序，但我设法创建了自己的播放本地音频文件的示例并在此处发布： https://github.com/nzkozar/ExoplayerExample

以下是从文件Uri准备播放器的所有工作的主要部分：

private void prepareExoPlayerFromFileUri(Uri uri){
        exoPlayer = ExoPlayerFactory.newSimpleInstance(this, new DefaultTrackSelector(null), new DefaultLoadControl());
        exoPlayer.addListener(eventListener);

        DataSpec dataSpec = new DataSpec(uri);
        final FileDataSource fileDataSource = new FileDataSource();
        try {
            fileDataSource.open(dataSpec);
        } catch (FileDataSource.FileDataSourceException e) {
            e.printStackTrace();
        }

        DataSource.Factory factory = new DataSource.Factory() {
            @Override
            public DataSource createDataSource() {
                return fileDataSource;
            }
        };
        MediaSource audioSource = new ExtractorMediaSource(fileDataSource.getUri(),
                factory, new DefaultExtractorsFactory(), null, null);

        exoPlayer.prepare(audioSource);
    }

你可以像这样得到Uri：Uri.fromFile(file)

如上所示准备好文件进行播放后，只需拨打exoPlayer.setPlayWhenReady(true);即可开始播放。

对于视频文件，您可能只需要将表面视图附加到exoPlayer对象，但我还没有真正使用ExoPlayer2完成此操作。

答案 1 :(得分：2)

对于那些想使用 ExoPlayer 2 从资产中播放视频的人，方法如下：

String playerInfo = Util.getUserAgent(context, "ExoPlayerInfo");
DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(
        context, playerInfo
);
MediaSource mediaSource = new ExtractorMediaSource.Factory(dataSourceFactory)
    .setExtractorsFactory(new DefaultExtractorsFactory())
    .createMediaSource(Uri.parse("asset:///your_video.mov"));
player.prepare(mediaSource);

答案 2 :(得分：1)

来自SD卡的视频播放使用以下代码。我的测试文件位于sdcard的视频目录中。

public static final Sample[] LOCAL_VIDEOS = new Sample[] {
        new Sample("test",
            Environment.getExternalStorageDirectory()+"/Videos/test.mp4", Util.TYPE_OTHER),
};

答案 3 :(得分：1)

如果您需要从assets字段中获取数据，则可以使用。这不会从SD卡中获取数据

package com.studio.mattiaferigutti.exoplayertest

import android.annotation.SuppressLint
import android.net.Uri
import android.os.Bundle
import android.util.Log
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import com.google.android.exoplayer2.*
import com.google.android.exoplayer2.source.ProgressiveMediaSource
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
import com.google.android.exoplayer2.upstream.*
import com.google.android.exoplayer2.upstream.DataSource.Factory
import com.google.android.exoplayer2.util.Util
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity(), Player.EventListener {

    private var player: SimpleExoPlayer? = null
    private var playWhenReady = true
    private var currentWindow = 0
    private var playbackPosition: Long = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    public override fun onStart() {
        super.onStart()
        if (Util.SDK_INT > 23) {
            initializePlayer("assets:///your_file.your_extension")
        }
    }

    public override fun onResume() {
        super.onResume()
        hideSystemUi()
        if (Util.SDK_INT <= 23 || player == null) {
            initializePlayer("assets:///your_file.your_extension")
        }
    }

    public override fun onPause() {
        super.onPause()
        if (Util.SDK_INT <= 23) {
            releasePlayer()
        }
    }

    public override fun onStop() {
        super.onStop()
        if (Util.SDK_INT > 23) {
            releasePlayer()
        }
    }

    private fun initializePlayer(path: String) {
        if (player == null) {
            val trackSelector = DefaultTrackSelector(this)
            trackSelector.setParameters(
                trackSelector.buildUponParameters().setMaxVideoSizeSd())
            player = SimpleExoPlayer.Builder(this)
                .setTrackSelector(trackSelector)
                .build()
        }
        video_view?.player = player
        video_view?.requestFocus()

        val dataSourceFactory = Factory { AssetDataSource(this@MainActivity) }

        val videoSource = ProgressiveMediaSource.Factory(dataSourceFactory)
            .createMediaSource(Uri.parse(path))

        player?.playWhenReady = playWhenReady
        player?.seekTo(currentWindow, playbackPosition)
        player?.addListener(this)
        player?.prepare(videoSource)
    }

    private fun releasePlayer() {
        if (player != null) {
            playbackPosition = player?.currentPosition!!
            currentWindow = player?.currentWindowIndex!!
            playWhenReady = player?.playWhenReady!!
            player?.removeListener(this)
            player?.release()
            player = null
        }
    }

    /**
     * set fullscreen
     */
    @SuppressLint("InlinedApi")
    private fun hideSystemUi() {
        video_view?.systemUiVisibility = (View.SYSTEM_UI_FLAG_LOW_PROFILE
                or View.SYSTEM_UI_FLAG_FULLSCREEN
                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION)
    }

    override fun onPlayerError(error: ExoPlaybackException) {
        super.onPlayerError(error)

        //handle the error
    }

    override fun onPlayerStateChanged(playWhenReady: Boolean, playbackState: Int) {
        val stateString: String = when (playbackState) {
            ExoPlayer.STATE_IDLE -> "ExoPlayer.STATE_IDLE      -"
            ExoPlayer.STATE_BUFFERING -> "ExoPlayer.STATE_BUFFERING -"
            ExoPlayer.STATE_READY -> "ExoPlayer.STATE_READY     -"
            ExoPlayer.STATE_ENDED -> "ExoPlayer.STATE_ENDED     -"
            else -> "UNKNOWN_STATE             -"
        }
        Log.d(TAG, "changed state to " + stateString
                + " playWhenReady: " + playWhenReady)
    }

    companion object {
        private val TAG = MainActivity::class.java.name
    }
}

答案 4 :(得分：0)

在某些设备中，您可以直接使用此路径＆＃39; /sdcard/nameoffile.mp4"。

答案 5 :(得分：0)

这对我有用。请尝试以下步骤：

获取文件的路径并启动播放器

File myFile = new File(extStore.getAbsolutePath() + "/folder/videos/" + video_name);  
videoUrl= String.valueOf(Uri.fromFile(myFile));  
initializePlayer(videoUrl);

初始化玩家

private void initializePlayer(String videoUrl) {
    player = ExoPlayerFactory.newSimpleInstance(
            new DefaultRenderersFactory(getActivity()),
            new DefaultTrackSelector(), new DefaultLoadControl());

    playerView.setPlayer(player);

    player.setPlayWhenReady(playWhenReady);
    player.seekTo(currentWindow, playbackPosition);

    Uri uri = Uri.parse(videoUrl);
    MediaSource mediaSource = buildMediaSource(uri);
    player.prepare(mediaSource, resetPositionBoolean, false);
}

构建媒体源

  private MediaSource buildMediaSource(Uri uri) {
    return new ExtractorMediaSource.Factory(
            new DefaultDataSourceFactory(getActivity(),"Exoplayer-local")).
            createMediaSource(uri);
}

答案 6 :(得分：0)

对于希望从资产文件夹加载的用户：

  

assets / xyz.mp4

通过将文件加载为：

  

“文件：/android_asset/xyz.mp4”

并使用DefaultDataSourceFactory。在exoplayer 2.4.4上检查。

答案 7 :(得分：0)

对于Exo player 2.13.3：

implementation 'com.google.android.exoplayer:exoplayer:2.13.3'

将您的视频放在资产文件夹中：

const val VIDEO_URL = "asset:///sample.mkv"

初始化播放器：

val mediaItem: MediaItem = MediaItem.fromUri(VIDEO_URL)
player.setMediaItem(mediaItem)

答案 8 :(得分：-1)

对于那些尝试播放 res / raw *文件夹中的视频文件的用户，这里是解决方案。请记住，我使用的是 ExoPlayer 的** 2.8.0 版本。

public class MainActivity extends AppCompatActivity {

PlayerView playerView;
SimpleExoPlayer simpleExoPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    playerView=findViewById(R.id.playerView);
}

@Override
protected void onStart() {
    simpleExoPlayer= ExoPlayerFactory.newSimpleInstance(this,new DefaultTrackSelector());
    DefaultDataSourceFactory defaultDataSourceFactory=new DefaultDataSourceFactory(this, Util.getUserAgent(this,"YourApplicationName"));
    simpleExoPlayer.setPlayWhenReady(true);
    ExtractorMediaSource extractorMediaSource=new ExtractorMediaSource.Factory(defaultDataSourceFactory).createMediaSource(RawResourceDataSource.buildRawResourceUri(R.raw.video));
    simpleExoPlayer.prepare(extractorMediaSource);
    playerView.setPlayer(simpleExoPlayer);

    super.onStart();
}

@Override
protected void onStop() {
    playerView.setPlayer(null);
    simpleExoPlayer.release();
    simpleExoPlayer=null;
    super.onStop();
}

}

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