如何捕捉视频帧Exoplayer android

Question

我试图使用Exoplayer在视频中的特定点捕获视频帧，但此代码总是捕获视频的第一帧。如何修复

MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(yourPath);
Bitmap bitmap = retriever.getFrameAtTime(simpleExoPlayer.getCurrentPosition());

Answer 1

这个方法应该在特定的点得到你想要的框架

public static Bitmap getVideoFrame(Context context, Uri uri, long time) {

Bitmap bitmap = null;
MediaMetadataRetriever retriever = new MediaMetadataRetriever();

try {

retriever.setDataSource(context, uri);
bitmap = retriever.getFrameAtTime(time);

} catch (RuntimeException ex) {
ex.printStackTrace();

} finally {

try {

retriever.release();

} catch (RuntimeException ex) {
ex.printStackTrace();
}
}

return bitmap;
}

Answer 2

应该是毫秒* 1000。固定!

Answer 3

您可以简单地使用exoplayer中存在的seekto()函数来播放视频的任何时间戳!

设置Exoplayer的代码: XML代码:

<com.google.android.exoplayer2.ui.PlayerView
android:id="@+id/videoPlayerView"
android:layout_width="0dp"
android:layout_height="200dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:layout_marginTop="10dp"/>

在你的类中定义这些变量:

private Context context;
private PlayerView videoPlayerView;
private ExoPlayer player;
String videoUri = "http://commondatastorage.googleapis.com/gtvvideos-bucket/sample/ForBiggerEscapes.mp4";

在类中创建一个函数来设置pexoplayer:

public void setVideoPlayer(long time) {
player = new ExoPlayer.Builder(context).build();
//Bind the player to the view.
playerView.setPlayer(player);
MediaItem mediaItem = MediaItem.fromUri(videoUri);
// Set the media item to be played.
player.setMediaItem(mediaItem);
// SeekTo particular timestamp in videoPlayer
player.seekTo(time * 1000);
// Prepare the player.
player.prepare();
// Start the playback.
player.play();
}

传递给你的playerview id (XML id)并运行应用程序!:)

//从第0秒开始播放视频

videoPlayerView.setVideoPlayer(0);

//从第10秒开始播放

videoPlayerView.setVideoPlayer(10);