用于android的Exoplayer，尝试流式传输m3u8文件时出错：没有可用的提取器可以读取流

Question

我试图传输一个m3u8文件，但出现了一个错误。我使用的url如下：http://storage.googleapis.com/videos.siku.org/10005/dash/master.m3u8这种流式视频在浏览器中也能正常工作。我在运行时遇到以下错误：

ExoPlayerImplInternal：源错误。com.google.android.exoplayer2.source。无法识别的输入格式异常：任何可用的提取器（MatroskaExtractor、FragmentedMp4Extractor、Mp4Extractor、Mp3Extractor、AdtsExtractor、Ac3Extractor、TsExtractor、FLVEExtractor、OGGEExtractor、PsExtractor、WaveExtractor、AmrExtractor、Ac4Extractor、FlaceExtractor）都无法读取流。位于com.google.android.exoplayer2.source.ProgressiveMediaPeriod$ExtractorHolder.selectextrator（ProgressiveMediaPeriod.java:1090）位于com.google.android.exoplayer2.source.ProgressiveMediaPeriod$ExtractingLoadable.load（ProgressiveMediaPeriod.java:969）位于com.google.android.exoplayer2.upstream.Loader$LoadTask.run（Loader.java:391）位于java.util.concurrent.threadpoolex（ThreadPoolExecutor.java:1162）在java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:636）在java.lang.Thread.run（Thread.java:764）

我使用的是ExoPlayerHelper类（它来自一个stackoverflow问题，尽管我确实以推荐的方式实现了它，但我也遇到了同样的错误）

这是我正在使用的类：

class ExoPlayerHelper(
    private val playerView: PlayerView,
    onError: (ExoPlaybackException) -> Unit,
    onPlayerBuffer: (Boolean) -> Unit
) {
    private var exoPlayer: ExoPlayer? = null
    private var mediaSource: ProgressiveMediaSource? = null
    private val playerListener = object : Player.EventListener {
        override fun onPlayerError(error: ExoPlaybackException) {
            super.onPlayerError(error)
            onError(error)
        }

        override fun onPlayerStateChanged(playWhenReady: Boolean, playbackState: Int) {
            super.onPlayerStateChanged(playWhenReady, playbackState)
            onPlayerBuffer(playbackState == Player.STATE_BUFFERING)
        }
    }

    fun initializePlayer(url: String) {
        exoPlayer = SimpleExoPlayer.Builder(playerView.context).build()
        exoPlayer!!.repeatMode = Player.REPEAT_MODE_ALL
        exoPlayer!!.addListener(playerListener)
        playerView.player = exoPlayer

        val userAgent =
            Util.getUserAgent(playerView.context, playerView.context.getString(R.string.app_name))
        mediaSource = ProgressiveMediaSource
            .Factory(
                DefaultDataSourceFactory(playerView.context, userAgent),
                DefaultExtractorsFactory()
            )
            .createMediaSource(Uri.parse(url))
            exoPlayer!!.prepare(mediaSource!!, true, false)
            exoPlayer!!.playWhenReady = true
        }
    }
}

我确实得到了一个空白的com.google.android.exoplayer2.ui。播放视图，显示控件。按下播放按钮时，我收到相同的错误消息：

com.google.android.exoplayer2.ExoPlaybackException:com.google.android.exoplayer2.source。无法识别的输入格式异常：任何可用的提取器（MatroskaExtractor、FragmentedMp4Extractor、Mp4Extractor、Mp3Extractor、AdtsExtractor、Ac3Extractor、TsExtractor、FLVEExtractor、OGGEExtractor、PsExtractor、WaveExtractor、AmrExtractor、Ac4Extractor、FlaceExtractor）都无法读取流。

有什么线索可以解释为什么我会遇到这个错误UnrecognedInputFormatException？

Answer 1

使用此方法必须使用HlsMediaSource

 Uri uri = Uri.parse(urlStream);
 //MediaSource mediaSource = buildMediaSource(uri);
 DataSource.Factory dataSourceFactory =
         new DefaultHttpDataSourceFactory(Util.getUserAgent(this, "app-name"));
 HlsMediaSource hlsMediaSource =
         new HlsMediaSource.Factory(dataSourceFactory).createMediaSource(uri);
 player = ExoPlayerFactory.newSimpleInstance(this);
 player.setPlayWhenReady(playWhenReady);
 player.seekTo(currentWindow, playbackPosition);

 // Create a player instance.

 // Prepare the player with the media source.
 //player.prepare(mediaSource);
 player.prepare(hlsMediaSource, false, false);

Answer 2

由于您正在尝试播放m3u8文件，因此您需要创建HLS传媒资源。所以只需进行以下更改-

mediaSource =HlsMediaSource.Factory(DefaultHttpDataSourceFactory(userAgent))
                .createMediaSource(uri)