Ich kann kein Video aufnehmen und gleichzeitig Frames aus dem onPreviewFrame-Callback nehmen

Question

Ich nehme Videos in meiner Android-Anwendung unter Verwendung von MediaRecorder auf und möchte auch Rahmendaten über den onPreviewFrame Callback.

Das Problem ist: Wenn die Vorschau in surfaceChanged Callback neu gestartet wird, dann funktioniert die Videoaufnahme nicht mehr. Wenn es nicht neu gestartet wird, indem Sie alles in surfaceChanged kommentieren, funktioniert die Videoaufnahme weiter, aber der Rückruf onPreviewFrame funktioniert nicht mehr.

Wie kann ich beide funktionieren lassen?

CameraActivity.java

import android.app.Activity; 
import android.hardware.Camera; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.os.Environment; 
import android.util.Log; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 

public class CameraActivity extends Activity implements SurfaceHolder.Callback, Camera.PreviewCallback { 
    private static final String TAG = "CameraActivity"; 

    public static final int MEDIA_TYPE_IMAGE = 1; 
    public static final int MEDIA_TYPE_VIDEO = 2; 

    private Camera mCamera; 
    private SurfaceView mPreview; 
    private SurfaceHolder mHolder; 
    private MediaRecorder mMediaRecorder; 
    private boolean isRecording = false; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_camera); 

     // Create an instance of Camera 
     mCamera = getCameraInstance(); 

     if (mCamera != null) { 
      // Create our Preview view and set it as the content of our activity. 
      mPreview = (SurfaceView) findViewById(R.id.camera_preview); 
      // Install a SurfaceHolder.Callback so we get notified when the 
      // underlying surface is created and destroyed. 
      mHolder = mPreview.getHolder(); 
      mHolder.addCallback(this); 
     } 

     startLockTask(); 
    } 

    public void surfaceCreated(SurfaceHolder holder) { 
     // The Surface has been created, now tell the camera where to draw the preview. 
     try { 
      mCamera.setPreviewCallback(this); 
      mCamera.setPreviewDisplay(holder); 
      mCamera.startPreview(); 

      prepareMediaRecorder(); 
      startVideoRecording(); 
     } catch (IOException e) { 
      Log.d(TAG, "Error setting camera preview: " + e.getMessage()); 
     } 
    } 

    public void surfaceDestroyed(SurfaceHolder holder) { 
     // empty. Take care of releasing the Camera preview in your activity. 
    } 

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { 
     // If your preview can change or rotate, take care of those events here. 
     // Make sure to stop the preview before resizing or reformatting it. 

     if (mHolder.getSurface() == null) { 
      // preview surface does not exist 
      return; 
     } 

     // stop preview before making changes 
     try { 
      mCamera.stopPreview(); 
     } catch (Exception e){ 
      // ignore: tried to stop a non-existent preview 
     } 

     // set preview size and make any resize, rotate or 
     // reformatting changes here 

     // start preview with new settings 
     try { 
      mCamera.setPreviewCallback(this); 
      mCamera.setPreviewDisplay(mHolder); 
      mCamera.startPreview(); 
     } catch (Exception e){ 
      Log.d(TAG, "Error starting camera preview: " + e.getMessage()); 
     } 
    } 

    @Override 
    public void onPreviewFrame(byte[] bytes, Camera camera) { 

    } 

    private boolean prepareMediaRecorder() { 
     mMediaRecorder = new MediaRecorder(); 

     mMediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener() { 
      @Override 
      public void onError(MediaRecorder mediaRecorder, int what, int extra) { 
       Log.e(TAG, "Media recorder error"); 
      } 
     }); 

     mMediaRecorder.setOnInfoListener(new MediaRecorder.OnInfoListener() { 
      @Override 
      public void onInfo(MediaRecorder mr, int what, int extra) { 
       if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) { 
        stopVideoRecording(); 
        releaseMediaRecorder(); 
        prepareMediaRecorder(); 
        startVideoRecording(); 
       } 
      } 
     }); 

     // Step 1: Unlock and set camera to MediaRecorder 
     mCamera.unlock(); 
     mMediaRecorder.setCamera(mCamera); 

     // Step 2: Set sources 
     //mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER); 
     mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); 

     // Step 3: Set a CamcorderProfile (requires API Level 8 or higher) 
//  mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW)); 

     mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
     mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); 
     mMediaRecorder.setVideoFrameRate(3); 
     mMediaRecorder.setVideoEncodingBitRate(6000000); 
     mMediaRecorder.setVideoSize(800, 480); 
     mMediaRecorder.setMaxDuration(60000); 

     // Step 4: Set output file 
     mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString()); 

     // Step 5: Set the preview output 
//  mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface()); 

     // Step 6: Prepare configured MediaRecorder 
     try { 
      mMediaRecorder.prepare(); 
     } catch (IllegalStateException e) { 
      Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage()); 
      releaseMediaRecorder(); 
      return false; 
     } catch (IOException e) { 
      Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage()); 
      releaseMediaRecorder(); 
      return false; 
     } 
     return true; 
    } 

    private void startVideoRecording() { 
     mMediaRecorder.start(); 
     isRecording = true; 
    } 

    private void stopVideoRecording() { 
     // stop recording and release camera 
     mMediaRecorder.stop(); // stop the recording 
     isRecording = false; 
    } 

    /** A safe way to get an instance of the Camera object. */ 
    public static Camera getCameraInstance(){ 
     Camera c = null; 
     try { 
      c = Camera.open(); // attempt to get a Camera instance 
     } 
     catch (Exception e){ 
      // Camera is not available (in use or does not exist) 
     } 
     return c; // returns null if camera is unavailable 
    } 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
     releaseMediaRecorder();  // if you are using MediaRecorder, release it first 
     releaseCamera();    // release the camera immediately on pause event 
    } 

    private void releaseMediaRecorder(){ 
     if (mMediaRecorder != null) { 
      mMediaRecorder.reset(); // clear recorder configuration 
      mMediaRecorder.release(); // release the recorder object 
      mMediaRecorder = null; 
      mCamera.lock();   // lock camera for later use 
     } 
    } 

    private void releaseCamera(){ 
     if (mCamera != null){ 
      mCamera.release();  // release the camera for other applications 
      mCamera = null; 
     } 
    } 

    /** Create a File for saving an image or video */ 
    private static File getOutputMediaFile(int type){ 
     // To be safe, you should check that the SDCard is mounted 
     // using Environment.getExternalStorageState() before doing this. 

     File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
       Environment.DIRECTORY_PICTURES), "MyCameraApp"); 
     // This location works best if you want the created images to be shared 
     // between applications and persist after your app has been uninstalled. 

     // Create the storage directory if it does not exist 
     if (! mediaStorageDir.exists()){ 
      if (! mediaStorageDir.mkdirs()){ 
       Log.d("MyCameraApp", "failed to create directory"); 
       return null; 
      } 
     } 

     // Create a media file name 
     String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
     File mediaFile; 
     if (type == MEDIA_TYPE_IMAGE){ 
      mediaFile = new File(mediaStorageDir.getPath() + File.separator + 
        "IMG_"+ timeStamp + ".jpg"); 
     } else if(type == MEDIA_TYPE_VIDEO) { 
      mediaFile = new File(mediaStorageDir.getPath() + File.separator + 
        "VID_"+ timeStamp + ".mp4"); 
     } else { 
      return null; 
     } 

     return mediaFile; 
    } 
} 

activity_camera.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
    <SurfaceView 
     android:id="@+id/camera_preview" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:layout_weight="1" 
     /> 
</LinearLayout> 

Answer 1

Ihr Code fast ähnlich ist unten angegeben, um eine Verknüpfung aber hier verwendeten sie TextureView statt Oberflächenansicht und benutzerdefinierte CameraView Klasse.

Das ist für mich gearbeitet, hilft hoffen, Ihnen auch

REF: https://github.com/googlesamples/android-MediaRecorder