如何在Android中捕获VideoView的屏幕截图或视频帧 [英] How to capture screenshot or video frame of VideoView in Android

问题描述

我已经尝试过此博客中的以下教程(http://android-er.blogspot.kr/2013/05/get-current-frame-in-videoview-using.html )，展示了如何使用 MediaMetadataRetriever 捕获视频帧来自视频源.但是，它仅适用于视频位于手机本地的情况.

I've tried the following tutorial from this blog ( http://android-er.blogspot.kr/2013/05/get-current-frame-in-videoview-using.html ), which shows how to capture a video frame using MediaMetadataRetriever from a video source. However, it only works if the video is located locally on the phone.

有没有办法在 VideoView 通过 IP 流式传输视频时捕获视频帧?

Is there a way to capture a video frame while the VideoView is streaming the video over IP?

推荐答案

我已经找到了解决这个问题的方法.由于使用 SurfaceView 时低级硬件 GPU 的原因，VideoView 似乎不允许这样做.

I have found a solution to this problem. It appears that the VideoView does not allow this because of low-level hardware GPU reasons while using a SurfaceView.

解决方案是使用 TextureView 并使用 MediaPlayer 在其中播放视频.Activity 将需要实现 TextureView.SurfaceTextureListener.使用此解决方案截取屏幕截图时，视频会冻结一小段时间.此外，TextureView 不会显示播放进度条(播放、暂停、FF/RW、播放时间等)的默认 UI.这是一个缺点.如果您有其他解决方案，请告诉我:)

The solution is to use a TextureView and use a MediaPlayer to play a video inside of it. The Activity will need to implement TextureView.SurfaceTextureListener. When taking a screenshot with this solution, the video freezes for a short while. Also, the TextureView does not display a default UI for the playback progress bar (play, pause, FF/RW, play time, etc). That is one drawback. If you have another solution please let me know :)

解决办法如下:

public class TextureViewActivity extends Activity 
    implements TextureView.SurfaceTextureListener, 
                OnBufferingUpdateListener, 
                OnCompletionListener, 
                OnPreparedListener, 
                OnVideoSizeChangedListener 
{
    private MediaPlayer mp;
    private TextureView tv;
    public static String MY_VIDEO = "https://www.blahblahblah.com/myVideo.mp4";
    public static String TAG = "TextureViewActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_texture_view);

        tv = (TextureView) findViewById(R.id.textureView1);
        tv.setSurfaceTextureListener(this);
    }

    public void getBitmap(TextureView vv)
    {
        String mPath = Environment.getExternalStorageDirectory().toString() 
                + "/Pictures/" + Utilities.getDayTimeString() + ".png";   
        Toast.makeText(getApplicationContext(), "Capturing Screenshot: " + mPath, Toast.LENGTH_SHORT).show();

        Bitmap bm = vv.getBitmap();
        if(bm == null)
            Log.e(TAG,"bitmap is null");

        OutputStream fout = null;
        File imageFile = new File(mPath);

        try {
            fout = new FileOutputStream(imageFile);
            bm.compress(Bitmap.CompressFormat.PNG, 90, fout);
            fout.flush();
            fout.close();
        } catch (FileNotFoundException e) {
            Log.e(TAG, "FileNotFoundException");
            e.printStackTrace();
        } catch (IOException e) {
            Log.e(TAG, "IOException");
            e.printStackTrace();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.media_player_video, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) 
    {
        Surface s = new Surface(surface);

        try
        {
            mp = new MediaPlayer();
            mp.setDataSource(MY_VIDEO);
            mp.setSurface(s);
            mp.prepare();

            mp.setOnBufferingUpdateListener(this);
            mp.setOnCompletionListener(this);
            mp.setOnPreparedListener(this);
            mp.setOnVideoSizeChangedListener(this);

            mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mp.start();

            Button b = (Button) findViewById(R.id.textureViewButton);
            b.setOnClickListener(new OnClickListener(){

                @Override
                public void onClick(View v) 
                {
                    TextureViewActivity.this.getBitmap(tv);
                }
            });
        }
        catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
    }

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