在Android中以慢动作播放视频 [英] Playback video in slow motion in android

问题描述

-我正在一个需要慢动作播放视频的项目.

- I am working on a project which needs to play video in slow motion.

-我很清楚Android不提供这些功能.

- I am well aware that Android doesn't provide these functionality.

-我发现拥有这些功能的 PVPlayer Engine 和 libVLC ，但是我没有找到任何包含它们的教程或适当的文档在android项目中并使用它们.

- I found PVPlayer Engine and libVLC which possessed these capabilities, but i didn't found any tutorial or proper documentation of including them in the android project and using them.

-因此，我尝试使用Runnable和Handler来完成此操作，该方法成功降低了视频播放速度，但在播放过程中却出现了混蛋.

- So i tried doing this by using Runnable and Handler, it was successful in slowing down the video but they possessed jerks during playing.

public class MainActivity extends Activity {

    VideoView vx;
    Button mbutt;
    Handler h ;
    int curr = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        h = new Handler();

        vx = (VideoView)findViewById(R.id.videoView);
        mbutt = (Button)findViewById(R.id.button_Play);

        vx.setVideoPath("/mnt/sdcard/you.mp4");

        mbutt.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                vx.start();
            }
        });


        Runnable r = new Runnable() {

            @Override
            public void run() {

                if (vx != null) {

                    if (vx.isPlaying()){

                        vx.pause();  
                    }
                    else{                        
                        vx.start(); 
                    }
                }

                h.postDelayed(this, 50);
            }
        };

        h.postDelayed(r, 200);






    }


}

-我尝试了各种不同的暂停时间和播放时间组合来消除抽搐，但徒劳无功，任何人都可以帮助我消除这些抽搐，以便播放一段不错的慢动作视频或建议另一个易于将库集成到我的android项目中.

- I have tried various combination of pause time and playing time to remove the jerks but all in vain, can anyone help me in removing these jerks so it plays a nice slow motion video or suggest another easy to integrate library into my android project.

先谢谢了……

推荐答案

我来晚了，但是我找到了API 23及更高版本的解决方案. Android 6.0 添加了 PlaybackParams 类来控制播放行为. -

I am late but I found a solution for API 23 and above. Android 6.0 added PlaybackParams class to control playback behavior. -

使用MediaPlayer的setPlaybackParams方法，如下所示-

Use setPlaybackParams method of MediaPlayer as given below -

videoview = (VideoView)findViewById(R.id.videoview);
videoview.setVideoURI("Your Video URI"); 
videoview.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    //works only from api 23
                    PlaybackParams myPlayBackParams = new PlaybackParams();
                    myPlayBackParams.setSpeed(0.5f); //here set speed eg. 0.5 for slow 2 for fast mode
                    mp.setPlaybackParams(myPlayBackParams);

                    videoview.start();//start your video.
                }
        });

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