首次集成ExoPlayer无法播放URL视频，遇MediaCodec音频解码错误

首次集成ExoPlayer，参照两篇教程和官方文档后，视频始终无法播放，日志抛出以下异常：

E/MediaCodec: Codec reported err 0x80001001, actionCode 0, while in state 6
E/MediaCodecAudioRenderer: Audio codec error
  java.lang.IllegalStateException
    at android.media.MediaCodec.native_dequeueOutputBuffer(Native Method)
    at android.media.MediaCodec.dequeueOutputBuffer(MediaCodec.java:2698)
    at com.google.android.exoplayer2.mediacodec.SynchronousMediaCodecAdapter.dequeueOutputBufferIndex(SynchronousMediaCodecAdapter.java:106)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.drainOutputBuffer(MediaCodecRenderer.java:1819)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:792)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:989)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:490)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:214)
    at android.os.HandlerThread.run(HandlerThread.java:65)
E/ExoPlayerImplInternal: Playback error
  com.google.android.exoplayer2.ExoPlaybackException: MediaCodecAudioRenderer error, index=1, format=Format(2, null, null, audio/mp4a-latm, mp4a.40.0, 96000, en, [-1, -1, -1.0], [1, 44100]), format_supported=YES
    at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:566)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:214)
    at android.os.HandlerThread.run(HandlerThread.java:65)
 Caused by: com.google.android.exoplayer2.mediacodec.MediaCodecDecoderException: Decoder failed: OMX.google.aac.decoder
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.createDecoderException(MediaCodecRenderer.java:945)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:813)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:989)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:490)
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:214) 
    at android.os.HandlerThread.run(HandlerThread.java:65) 
 Caused by: java.lang.IllegalStateException
    at android.media.MediaCodec.native_dequeueOutputBuffer(Native Method)
    at android.media.MediaCodec.dequeueOutputBuffer(MediaCodec.java:2698)
    at com.google.android.exoplayer2.mediacodec.SynchronousMediaCodecAdapter.dequeueOutputBufferIndex(SynchronousMediaCodecAdapter.java:106)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.drainOutputBuffer(MediaCodecRenderer.java:1819)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:792)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:989) 
    at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:490) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:214) 
    at android.os.HandlerThread.run(HandlerThread.java:65) 

PlayerActivity中的代码如下：

playerView = findViewById(R.id.player_view);
progressBar = findViewById(R.id.progress_bar);
btnFullscreen = findViewById(R.id.btn_fullscreen);

//Fullscreen activity
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

//Get intent Extras
String urlExtra = getIntent().getStringExtra("videoUrl");

//Parse video url
Uri videoUri = Uri.parse(urlExtra);

ExoPlayer player = new ExoPlayer.Builder(this).build();

// Bind the player to the view.
playerView.setPlayer(player);

// Build the media item.
MediaItem mediaItem = MediaItem.fromUri(videoUri);
// Set the media item to be played.
player.setMediaItem(mediaItem);
// Prepare the player.
player.prepare();
// Start the playback.
player.play();

排查与解决建议 #

1. 检查音频解码器与视频文件

   • 日志明确指向OMX.google.aac.decoder解码失败，先换一个标准AAC编码的测试视频，排除原视频音频流损坏的可能
   • 重启测试设备，修复系统音频解码器临时异常

2. 添加ExoPlayer解码器容错配置
   修改播放器构建代码，开启解码器降级 fallback，让ExoPlayer在硬件解码器失败时自动切换到软件解码器：

   DefaultRenderersFactory renderersFactory = new DefaultRenderersFactory(this)
           .setEnableAudioDecoderFallback(true);
   ExoPlayer player = new ExoPlayer.Builder(this)
           .setRenderersFactory(renderersFactory)
           .build();
   

3. 完善播放器生命周期管理
   当前代码未处理Activity生命周期，容易导致资源泄漏或状态异常，添加以下生命周期回调：

   @Override
   protected void onStart() {
       super.onStart();
       player.play();
   }
   
   @Override
   protected void onPause() {
       super.onPause();
       player.pause();
   }
   
   @Override
   protected void onStop() {
       super.onStop();
       player.stop();
   }
   
   @Override
   protected void onDestroy() {
       super.onDestroy();
       player.release();
   }
   

4. 确认网络权限（针对网络视频）
   如果播放的是网络视频，确保AndroidManifest.xml中已添加必要权限：

   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
   

内容的提问来源于stack exchange，提问作者Bryne Phiri