在风景中播放视频，尽管我是在肖像中录制的

Question

正如标题所说，我有这个代码来准备我的记录器：

private boolean prepareMediaRecorder(){
    myCamera = getCameraInstance();

    Camera.Parameters p = myCamera.getParameters();

    p.set("orientation", "landscape");
    p.set("rotation", 90);
    myCamera.setParameters(p);

    myCamera.setDisplayOrientation(90);

    myCamera.unlock();
    mediaRecorder = new MediaRecorder();
    mediaRecorder.setCamera(myCamera);

    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

    mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));

    File tempFile = new File(Environment.getExternalStorageDirectory(), "/rec/temp/video_" + String.valueOf(videoCount) + ".mp4");
    mediaRecorder.setOutputFile(tempFile.getPath());
    mediaRecorder.setMaxDuration(12500); // Set max duration 11 sec.
    mediaRecorder.setMaxFileSize(7000000); // Set max file size 7M

    mediaRecorder.setPreviewDisplay(myCameraSurfaceView.getHolder().getSurface());


    try {
        mediaRecorder.prepare();
    } catch (IllegalStateException e) {
        releaseMediaRecorder();
        return false;
    } catch (IOException e) {
        releaseMediaRecorder();
        return false;
    }
    return true;

}

我在我的表面视图中有：

@Override
    public void surfaceChanged(SurfaceHolder holder, int format, int weight,
            int height) {
        // 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 {

            myCamera.setDisplayOrientation(90);

            mCamera.startPreview();

        } catch (Exception e){
        }
    }

这是唯一两个使用摄像头的地方(旋转)…在录制的时候，一切都是肖像的，但是当我回放视频的时候，它是风景的。有人能告诉我为什么和如何解决这个问题吗？

Answer 1

使用setOrientationHint(整数度) http://developer.android.com/reference/android/media/MediaRecorder.html#setOrientationHint(int)

mediaRecorder.setOrientationHint (90 )；(90表示后置摄像头，270表示前置摄像头)在mediaRecorder.prepare()之前调用此函数；