显然这与多项活动无关,这与视频文件的编码有关。
我将尝试简化问题:我有一个处于暂停状态的MediaPlayer对象,当我调用mediaPlayer.getCurrentPosition()
时,我得到的结果是准确的。当我在此对象上调用mediaPlayer.setSurface()
(使用不同的曲面)后跟mediaPlayer.play()
时,视频的播放位置与getCurrentPosition()返回的位置不同。我正在测试API> = ICE_CREAM_SANDWICH。
链接到视频文件:http://wpc.4ba9.edgecastcdn.net/804BA9/testenvmedia/m_8705_LuS3w7ctSZjB.mov.bs.mp4
我有两项活动,活动A和活动B.
活动-A使用TextureView
将视频从远程流播放到MediaPlayer
,
它还有一个按钮,其目的是:
调用mediaPlayer.pause();
打开活动-B。
活动-B还有一个TextureView
,它应该使用相同的MediaPlayer
对象在其当前位置播放相同的视频。
活动-A onCreate方法:
textureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int w, int h) {
try {
final MediaPlayer mediaPlayer = MyApplication.getMediaPlayer();
mediaPlayer.setDataSource(context, videoURI);
mediaPlayer.setSurface(new Surface(surfaceTexture));
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setLooping(shouldLoop);
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
}
});
mediaPlayer.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) { return false; }
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {}
});
btnFullScreen.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
Log.e("WHATEVER", ">>> pause video at " + MyApplication.getMediaPlayer().getCurrentPosition());
MyApplication.getMediaPlayer().pause();
Intent intent = new Intent(getActivity(), ActivityB.class);
startActivity(intent);
}});
Activity-B onCreate方法:
textureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int w, int h) {
MediaPlayer mediaPlayer = MyApplication.getMediaPlayer();
mediaPlayer.setSurface(new Surface(surface));
Log.e("WHATEVER", ">>> resume video at " + mediaPlayer.getCurrentPosition());
mediaPlayer.start();
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
return false;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
});
LogCat输出:
10-10 17:33:15.966 13886-13886/com.whatever.android.debug E/WHATEVER﹕ >>> pause video at 1958
10-10 17:33:16.817 13886-13886/com.whatever.android.debug E/WHATEVER﹕ >>> resume video at 1958
所以即使看起来MediaPlayer会从那个确切的位置恢复,我对不同的视频会有不同的行为,每次我尝试在Activity-B中播放时,大多数都会从完全相同的帧开始视频从一开始就开始,另一个视频每次都从其他点开始。
来自Android的MediaPlayer.SetSurface()
方法文档:
This method can be called in any state and calling it does not change the object state.
非常感谢任何帮助。 谢谢!
答案 0 :(得分:7)
似乎您的问题在于此特定视频,更多关键帧将有助于玩家更准确地恢复播放。
尝试再次重新编码,使用ffmpeg和libx264尝试添加以下参数:
-g=25 -keyint_min=25
答案 1 :(得分:0)
尝试使用Intent.putExtra()
将MediaPlayer的位置从活动A传递到活动B.所以基本上在活动A中你打算开始活动B的意图,你会这样做:
public void onClick(View v) {
Log.e("WHATEVER", ">>> pause video at " + MyApplication.getMediaPlayer().getCurrentPosition());
MyApplication.getMediaPlayer().pause();
int position = MyApplication.getMediaPlayer().getCurrentPosition(); //new line added
Intent intent = new Intent(getActivity(), ActivityB.class);
intent.putExtra("position", position); //another new line of code
startActivity(intent);
}
现在在活动B中,在调用start之前寻找媒体播放器暂停的位置,如下所示:
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int w, int h) {
MediaPlayer mediaPlayer = MyApplication.getMediaPlayer();
mediaPlayer.setSurface(new Surface(surface));
Log.e("WHATEVER", ">>> resume video at " + mediaPlayer.getCurrentPosition());
mediaPlayer.seekTo(getIntent().getExtras().getInt("position"));// new line of code
mediaPlayer.start();
}