Android相机录制视频但播放颠倒

时间：2012-07-11 05:40:58

标签： android android-camera

我使用以下代码录制视频，并且录制完美，但是当播放视频时，它会上下颠倒。

我在mrec.setOrientationHint(180)之前尝试了设置mrec.prepare();，但它没用。任何提示？

import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

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.Menu;
import android.view.MenuItem;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;

/**
 * @author SANA HASSAN
 */
public class CameraSurfaceView extends Activity {

    private Preview mPreview;
    private MediaRecorder mrec = new MediaRecorder();
    private int cameraId = 0;
    private Camera mCamera;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        mPreview = new Preview(this);
        setContentView(mPreview);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add(0, 0, 0, "Start");
        menu.add(0, 1, 0, "Stop");
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case 0:
                try {
                    startRecording();
                } 
                catch (Exception e) {
                    e.printStackTrace();
                    mrec.release();
                }
                break;

            case 1: 
                mrec.stop();
                mrec.release();
                mrec = null;
                break;

            default:
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    protected void startRecording() throws IOException  {

        mrec = new MediaRecorder();
        mrec.setCamera(mCamera);
        mCamera.unlock();
        File directory = new File(Environment.getExternalStorageDirectory()+"/NICUVideos");
        directory.mkdirs();
        mrec.setAudioSource( MediaRecorder.AudioSource.MIC);
        mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mrec.setOutputFile(Environment.getExternalStorageDirectory()+"/NICUVideos/"+System.currentTimeMillis()+".mp4"); 
        mrec.setPreviewDisplay(mPreview.getHolder().getSurface());
        mrec.setVideoSize(640, 480);

        Method[] methods = mrec.getClass().getMethods();
        for (Method method: methods){
            try{
                if(method.getName().equals("setAudioEncodingBitRate")){
                    method.invoke(mrec, 12200);
                }
                else if(method.getName().equals("setVideoEncodingBitRate")){
                    method.invoke(mrec, 800000);
                }
                else if(method.getName().equals("setAudioSamplingRate")){
                    method.invoke(mrec, 8000);
                }
                else if(method.getName().equals("setVideoFrameRate")){
                    method.invoke(mrec, 20);
                }
            }
            catch (IllegalArgumentException e) {
                e.printStackTrace();
            } 
            catch (IllegalAccessException e) {
                e.printStackTrace();
            } 
            catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }
        mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mrec.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
        mrec.setMaxDuration(60000); // 60 seconds
        mrec.setMaxFileSize(10000000); // Approximately 10 megabytes
        mrec.prepare();
        mrec.start();
    }

    protected void stopRecording() {
        mrec.stop();
        mrec.release();
        mCamera.release();
    }

    class Preview extends SurfaceView implements SurfaceHolder.Callback {
        SurfaceHolder mHolder;
        Activity activity;

        Preview(Activity activity) {
            super(activity);
            mHolder = getHolder();
            mHolder.addCallback(this);
            mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }

        public void surfaceCreated(SurfaceHolder holder) {

            Camera.CameraInfo info=new Camera.CameraInfo();
            for (int i=0; i < Camera.getNumberOfCameras(); i++) {
                Camera.getCameraInfo(i, info);
                if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                    mCamera=Camera.open(i);
                    cameraId = i;
                }
            }

            try {
               mCamera.setPreviewDisplay(holder);
            } catch (IOException exception) {
                mCamera.release();
                mCamera = null;
            }
        }

        public void surfaceDestroyed(SurfaceHolder holder) {
            mCamera.stopPreview();
            mCamera.release();
            mCamera = null;
        }

        public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
            setCameraDisplayOrientation(mCamera);
            mCamera.startPreview();
        }

        public void setCameraDisplayOrientation(Camera camera) {
            Camera.CameraInfo info = new Camera.CameraInfo();
            Camera.getCameraInfo(cameraId, info);

            int rotation = CameraSurfaceView.this.getWindowManager().getDefaultDisplay().getRotation();
            int degrees = 0;
            switch (rotation) {
                case Surface.ROTATION_0: degrees = 0; break;
                case Surface.ROTATION_90: degrees = 90; break;
                case Surface.ROTATION_180: degrees = 180; break;
                case Surface.ROTATION_270: degrees = 270; break;
            }

            int result;
            if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                result = (info.orientation + degrees) % 360;
                result = (360 - result) % 360;  // compensate the mirror
            } else {  // back-facing
                result = (info.orientation - degrees + 360) % 360;
            }
            Log.d(Vars.TAG, "Result = "+result);
            camera.setDisplayOrientation(result);
        }
    }

}

10 个答案:

答案 0 :(得分：15)

这个问题是由于Android通过设置一些元数据而不是实际旋转视频来处理轮换，而某些播放软件则忽略了该设置。

如the docs中所述：

  

请注意，某些视频播放器可能会在播放过程中选择忽略视频中的构图矩阵。

您可以选择使用能够理解所设置元数据的不同播放软件，或者在将视频录制到正确方向后重新编码视频。从您的描述中不清楚哪些是您的情况下更好的解决方案。

答案 1 :(得分：7)

这应该在mrec.prepare();方法之前调用

setOrientationHint(degrees);

Link

编辑： 试试mCamera.setDisplayOrientation(degrees); 

0 for landscape
90 for portrait
180 & 270 don't work very well and give weird results.

一些较老的播放器和编码器不会解释此标志，这就是视频颠倒的原因。

答案 2 :(得分：2)

我有同样的问题，我注意到相机预览方向角和录制视频角度不一样。 所以我使用这种方法来改变视频录制的方向：

public static int getVideoOrientationAngle(Activity activity, int cameraId) { //The param cameraId is the number of the camera.
    int angle;
    Display display = activity.getWindowManager().getDefaultDisplay();
    int degrees = display.getRotation();
    android.hardware.Camera.CameraInfo info =
            new android.hardware.Camera.CameraInfo();
    android.hardware.Camera.getCameraInfo(cameraId, info);
    switch (degrees) {
        case Surface.ROTATION_0: 
            angle = 90; 
            break;
        case Surface.ROTATION_90:
            angle = 0;
            break;
        case Surface.ROTATION_180:
            angle = 270;
            break;
        case Surface.ROTATION_270:
            angle = 180;
            break;
        default:
            angle = 90;
            break;
    }
    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
        angle = (angle + 180) % 360;

    return angle;
}

对于相机预览的更改方向：

 public static int setCameraDisplayOrientation(Activity activity,
                                              int cameraId, android.hardware.Camera camera) {
    android.hardware.Camera.CameraInfo info =
            new android.hardware.Camera.CameraInfo();
    android.hardware.Camera.getCameraInfo(cameraId, info);
    int rotation = activity.getWindowManager().getDefaultDisplay()
            .getRotation();
    int degrees = 0;
    switch (rotation) {
        case Surface.ROTATION_0:
            degrees = 0;
            break;
        case Surface.ROTATION_90:
            degrees = 90;
            break;
        case Surface.ROTATION_180:
            degrees = 180;
            break;
        case Surface.ROTATION_270:
            degrees = 270;
            break;
    }

    int result;
    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        result = (info.orientation + degrees) % 360;
        result = (360 - result) % 360;  // compensate the mirror
    } else {  // back-facing
        result = (info.orientation - degrees + 360) % 360;
    }
    camera.setDisplayOrientation(result);
    return result;
}

请注意，了解相机是正面还是背面非常重要。

答案 3 :(得分：1)

我知道你的问题，

来自Media Recorder的视频使用Camera，因此您需要rotate Media Recorder。使用以下代码应解决您的问题。

/**
 * 
 * @param mMediaRecorder
 * @return
 */
public static MediaRecorder rotateBackVideo(MediaRecorder mMediaRecorder) {
    /**
     * Define Orientation of video in here,
     * if in portrait mode, use value = 90,
     * if in landscape mode, use value = 0
     */
    switch (CustomCamera.current_orientation) {
        case 0:
            mMediaRecorder.setOrientationHint(90);
            break;
        case 90:
            mMediaRecorder.setOrientationHint(180);
            break;
        case 180:
            mMediaRecorder.setOrientationHint(270);
            break;
        case 270:
            mMediaRecorder.setOrientationHint(0);
            break;
    }

    return mMediaRecorder;
}

应在prepare()方法之前添加：

// Step 5: Set the preview output
    /**
     * Define Orientation of image in here,
     * if in portrait mode, use value = 90,
     * if in landscape mode, use value = 0
     */
    CustomCamera.mMediaRecorder = Utils.rotateBackVideo(CustomCamera.mMediaRecorder);
    CustomCamera.mMediaRecorder.setPreviewDisplay(mCameraPreview.getHolder().getSurface());

谢谢

答案 4 :(得分：1)

使用OrientationEventListener并在设备旋转code here时跟踪旋转值。此代码将旋转应用于相机，但对于录制，您需要将旋转应用于MediaRecorder。当您开始录制mMediaRecorder.setOrientationHint(rotation)时1 {}在mMediaRecorder.prepare()之前。这解决了我的问题。

答案 5 :(得分：0)

最后我发现摩托罗拉手机在播放以纵向模式录制的视频时出现问题。

为了克服视频的轮换，我采用的最佳解决方案是将视频上传到服务器并使用ffmpeg -i input.mp4 -c:v mpeg4 -c:a copy -c:s copy -vf "transpose=2" output.mp4

命令运行ffmpeg

如果您觉得还有其他方式，请告诉我。

答案 6 :(得分：0)

另一个解决方案是旋转您的活动，使其方向与传感器方向相同。也就是说，后置摄像头的景观和前置摄像头的倒置肖像。这个btw不会修复前置摄像头的镜面效果。另一个难点是，您必须以遵循活动方向的方式在这些轮换活动中实施您的UI。

答案 7 :(得分：0)

旋转您的MediaRecorder，如下所示，对应您在前置摄像头视频录制的摄像头显示方向中使用的度数

Display display = ((WindowManager)getContext().getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
        parameters.setPreviewSize(height, width);
        if(display.getRotation() == Surface.ROTATION_0)
        {

            mCamera.setDisplayOrientation(90);
            mMediaRecorder.setOrientationHint(270);
        }

        if(display.getRotation() == Surface.ROTATION_90)
        {
            mMediaRecorder.setOrientationHint(180);
        }

        if(display.getRotation() == Surface.ROTATION_180)
        {
            mMediaRecorder.setOrientationHint(270);
        }

        if(display.getRotation() == Surface.ROTATION_270)
        {
            mCamera.setDisplayOrientation(180);
            mMediaRecorder.setOrientationHint(0);
        }

答案 8 :(得分：0)

以下是自定义人像摄像头的代码，将设置正确的图片和视频旋转：

private OrientationEventListener orientationEventListener;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //...
    orientationEventListener = new OrientationEventListener(this) {
        @Override
        public void onOrientationChanged(int orientation) {
            if (orientation == ORIENTATION_UNKNOWN) return;

            flashButton.setRotation(-(orientation));
            cameraButton.setRotation(-(orientation));

            if (camera != null) {
                Parameters parameters = camera.getParameters();
                CameraInfo info = new CameraInfo();
                Camera.getCameraInfo(selectedCamera, info);
                orientation = (orientation + 45) / 90 * 90;
                int rotation = 0;
                if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
                    rotation = (info.orientation - orientation + 360) % 360;
                } else {  // back-facing camera
                    rotation = (info.orientation + orientation) % 360;
                }
                parameters.setRotation(rotation);
                if (!isRecording) {
                    mediaRecorder.setOrientationHint(rotation);
                }

                camera.setParameters(parameters);
            }
        }
    };
}


@Override
protected void onResume() {
    super.onResume();
    //...
    orientationEventListener.enable();
}

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

具有纵向的Teste。记得把它放在你的清单中来测试代码。我不知道是否在风景中工作。

<activity android:name=".activities.CameraActivity"
          android:screenOrientation="portrait">

答案 9 :(得分：0)

用于纵向模式设置mediaRecorder.setOrientationHint（90）;度数与相机方向相同myCamera.setDisplayOrientation（90）;

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