在 Samsung Galaxy S2 上使用 Android MediaRecorder 录制的视频已损坏

Question

再会！我正在学习如何使用 MediaRecorder 录制视频，但播放时录制的视频已损坏。请参阅此屏幕截图： http://www.4shared.com/photo/QtmJCHRi/corrupted -video.html。左上角红色矩形标记的图片是相机可以看到的。但它很小，而且是重复的，而且有很多绿地。请告诉我我做错了什么。硬件是三星 Galaxy S2（GT-I9100，Android 2.3.5）。我尝试遵循本教程：http://developer.android。 com/guide/topics/media/camera.html# saving-media

预先感谢您！

CameraRecorderActivity.java

package cz.ryvo.android.camerarecorder;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.FrameLayout;

public class CameraRecorderActivity extends Activity 
implements SurfaceHolder.Callback, OnClickListener {

private static final String TAG = "CameraRecorderActivity";

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

private Camera mCamera;
private CameraPreview mPreview;
private MediaRecorder mMediaRecorder;
private Button captureButton;
private boolean isRecording = false;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    // Create an instance of Camera.
    mCamera = getCameraInstance();
    // Create preview view and set it as the content of our activity.
    mPreview = new CameraPreview(this, mCamera);
    int i = R.id.camera_preview;
    Object o = this.findViewById(i);
    FrameLayout preview = (FrameLayout) o;
    preview.addView(mPreview);

 // Add a listener to the Capture button
    captureButton = (Button) findViewById(R.id.button_capture);
    captureButton.setOnClickListener(
        new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isRecording) {
                    // stop recording and release camera
                    mMediaRecorder.stop();  // stop the recording
                    releaseMediaRecorder(); // release the MediaRecorder object
                    mCamera.lock();         // take camera access back from MediaRecorder

                    // inform the user that recording has stopped
                    setCaptureButtonText("Capture");
                    isRecording = false;
                } else {
                    // initialize video camera
                    if (prepareVideoRecorder()) {
                        // Camera is available and unlocked, MediaRecorder is prepared,
                        // now you can start recording
                        mMediaRecorder.start();

                        // inform the user that recording has started
                        setCaptureButtonText("Stop");
                        isRecording = true;
                    } else {
                        // prepare didn't work, release the camera
                        releaseMediaRecorder();
                        // inform user
                    }
                }
            }
        }
    );
}

public void setCaptureButtonText(String s) {
    captureButton.setText(s);
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    // The Surface has been created, now tell the camera where to draw the preview.
    try {
        mCamera.setPreviewDisplay(holder);
        mCamera.startPreview();
    } catch (IOException e) {
        Log.d(TAG, "Error setting camera preview: " + e.getMessage());
    }
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    // TODO Auto-generated method stub
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub
}

/** 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;
}

private boolean prepareVideoRecorder(){
    //mCamera = getCameraInstance();
    mMediaRecorder = new MediaRecorder();
    // 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);
    mMediaRecorder.setVideoSize(720, 480);
    // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
    mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
    // 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;
}


@Override
public void onClick(View v) {
    /*
    Log.i("onClick", "BEGIN");
    if(!recording) {
        recording = startRecording();
    } else {
        stopRecording();
        recording = false;
    }
    Log.i("onClick", "END");
    */
}

@Override
protected void onPause() {
    super.onPause();
    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;
    }
}

  private Camera getCameraInstance(){
          Camera c = null;
          try {
              c = Camera.open(); // attempt to get a Camera instance
              //c = this.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
    }

    public Camera open() {
        int numberOfCameras = Camera.getNumberOfCameras();
        CameraInfo cameraInfo = new CameraInfo();
        for (int i = 0; i < numberOfCameras; i++) {
            Camera.getCameraInfo(i, cameraInfo);
            if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
                return Camera.open(i);
            }
        }
        return null;
    }     
}

CameraPreview.java

package cz.ryvo.android.camerarecorder;

import java.io.IOException;
import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {

private static final String TAG = "CameraPreview";

private SurfaceHolder mHolder;
private Camera mCamera;

public CameraPreview(Context context, Camera camera) {
    super(context);
    mCamera = camera;
    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mHolder = getHolder();
    mHolder.addCallback(this);
    // deprecated setting, but required on Android versions prior to 3.0
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

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

    // make any resize, rotate or reformatting changes here

    // start preview with new settings
    try {
        mCamera.setPreviewDisplay(mHolder);
        mCamera.startPreview();

    } catch (Exception e){
        Log.d(TAG, "Error starting camera preview: " + e.getMessage());
    }
  }
}

Answer 1

我在某处读到过它（我认为是在SO中）。问题在于，三星 Galaxy 显然不支持高质量录制 (CamcorderProfile.QUALITY_HIGH)。

尝试使用 CamcorderProfile.QUALITY_LOW。看看它是否有效。

编辑：我在此处发现了同样的问题