处于暂停状态时Android的MediaPlayer setSurface

Question

编辑:

显然这与多个活动无关,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,当我打电话时,mediaPlayer.getCurrentPosition()我得到一个准确的结果.当我调用mediaPlayer.setSurface()(使用不同的曲面)后跟mediaPlayer.play()此对象时,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.

• 使用项目中的本地资源和通过网络流进行测试,结果:没有区别.

链接到视频文件:http://wpc.4ba9.edgecastcdn.net/804BA9/testenvmedia/m_8705_LuS3w7ctSZjB.mov.bs.mp4

---

我有两个活动,活动A和活动B.

Activity-A播放从远程流到TextureView使用a的视频MediaPlayer,它还包含一个按钮,其目的是:

1. 调用mediaPlayer.pause();

2. 打开活动-B.

Activity-B还包含一个TextureView应该使用相同MediaPlayer对象在其当前位置播放相同视频的视频.

Activity-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

---

因此即使看起来MediaPlayer将从那个确切的位置恢复,我对不同的视频也会有不同的行为,每次我尝试在Activity-B中播放时,大多数都从完全相同的帧开始,一个视频开始于一开始,其他人每次都从其他地方开始.

从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.

任何帮助将不胜感激.谢谢!

Answer 1

看来你的问题在于这个特定的视频,更多关键帧将帮助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