Exoplayer源错误

Question

在遵循《开发者指南》中给出的示例之后，我得到了以下信息：

05-23 16:25:22.002 11893-11942/com.app.videotest E/ExoPlayerImplInternal: Source error.

设置：

// 1. Create a default TrackSelector
        BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
        TrackSelection.Factory videoTrackSelectionFactory =
                new AdaptiveTrackSelection.Factory(bandwidthMeter);
        TrackSelector trackSelector =
                new DefaultTrackSelector(videoTrackSelectionFactory);

        // 2. Create the player
        SimpleExoPlayer player =
                ExoPlayerFactory.newSimpleInstance(this, trackSelector);

        // Bind the player to the view.
        PlayerView playerView = findViewById(R.id.player_view);
        playerView.setPlayer(player);

        // Produces DataSource instances through which media data is loaded.
        DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this,
                Util.getUserAgent(this, "yourApplicationName"), null);
        // This is the MediaSource representing the media to be played.
        MediaSource videoSource = new ExtractorMediaSource.Factory(dataSourceFactory)
                .createMediaSource(Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"));
        // Prepare the player with the source.
        player.prepare(videoSource);

布局：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.google.android.exoplayer2.ui.PlayerView
        android:id="@+id/player_view"
        android:layout_width="200dp"
        android:layout_height="200dp" />
</android.support.constraint.ConstraintLayout>

完整日志：

05-23 16:25:18.919 11893-11893/? D/AppTracker: App Event: start
05-23 16:25:18.931 11893-11943/? D/OpenGLRenderer: HWUI GL Pipeline
05-23 16:25:18.946 11893-11945/? I/DpmTcmClient: RegisterTcmMonitor from: com.android.okhttp.TcmIdleTimerMonitor
05-23 16:25:18.951 11893-11945/? D/NetworkSecurityConfig: No Network Security Config specified, using platform default
05-23 16:25:18.982 11893-11943/? I/Adreno: QUALCOMM build                   : 08cdca0, I5f270ba9bc
    Build Date                       : 09/18/17
    OpenGL ES Shader Compiler Version: EV031.20.00.04
    Local Branch                     : 
    Remote Branch                    : refs/tags/AU_LINUX_ANDROID_LA.UM.6.5.R1.08.00.00.312.025
    Remote Branch                    : NONE
    Reconstruct Branch               : NOTHING
05-23 16:25:18.982 11893-11943/? I/vndksupport: sphal namespace is not configured for this process. Loading /vendor/lib64/hw/gralloc.msm8996.so from the current namespace instead.
05-23 16:25:18.985 11893-11943/? I/Adreno: PFP: 0x005ff087, ME: 0x005ff063
05-23 16:25:18.990 11893-11943/? I/OpenGLRenderer: Initialized EGL, version 1.4
05-23 16:25:18.990 11893-11943/? D/OpenGLRenderer: Swap behavior 2
05-23 16:25:19.072 11893-11943/? I/vndksupport: sphal namespace is not configured for this process. Loading /vendor/lib64/hw/gralloc.msm8996.so from the current namespace instead.
05-23 16:25:21.057 11893-11920/com.app.videotest I/zygote64: Do partial code cache collection, code=28KB, data=28KB
05-23 16:25:21.059 11893-11920/com.app.videotest I/zygote64: After code cache collection, code=28KB, data=28KB
    Increasing code cache capacity to 128KB
05-23 16:25:22.002 11893-11942/com.app.videotest E/ExoPlayerImplInternal: Source error.

网址肯定有效（我已经尝试了其他几个）。我错过了什么？

更新：
当我在本地加载视频时，播放器确实工作了。不过这并不能解决我的问题。

Answer 1

你在用Android8吗？就我而言，我有错误

Caused by: java.io.IOException: Cleartext HTTP traffic to clips.vorwaerts-gmbh.de not permitted

然后，基于此线程，您需要将清单（最简单的清单）修改为：

<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        ...
        android:usesCleartextTraffic="true"
        ...>
        ...
    </application>
</manifest>

请参阅上面链接的详细信息