Media Recorder在三星Galaxy S3前置摄像头的Android中启动失败

我正在使用视频录制应用程序，我想在其中显示预览，并且当用户单击“录制”按钮时它开始录制，而当用户单击“停止”按钮时它停止录制。

我得到了相机预览，并且记录回相机工作正常。

但是，当我将摄像机翻转到前置摄像机并开始记录时，会出现如下错误：

FATAL EXCEPTION: main java.lang.RuntimeException: start failed. 
        at android.media.MediaRecorder.start(Native Method) at 
        com.opkix.app.fragments.CameraFragment.startRecording(
                                             CameraFragment.java:104)

这是我录制视频代码的代码：

private boolean prepareMediaRecorder() {
    // set the orientation here to enable portrait recording.

    mediaRecorder = new MediaRecorder();

    mCamera.unlock();

    mediaRecorder.setCamera(mCamera);

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

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


    mediaRecorder.setOutputFile(StorageUtils.getOutputMediaFilePath());
    mediaRecorder.setMaxDuration(120000); // Set max duration 60 sec.
    mediaRecorder.setMaxFileSize(100000000); // Set max file size 50Mb

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

}

有人可以建议解决方案吗？

现在，我也在使用Video Recording App。请一次在其他设备上运行您的代码。我也与您共享我的代码。其中一些代码与我的应用程序相关。如果不需要，请删除那。

我的代码：

private boolean prepareVideoRecorder() {
    mRecorder = new MediaRecorder();

    // Both are required for Portrait Video
    mCamera.setDisplayOrientation(90);
    if (mCameraId == CAMERA_FACING_FRONT) {
        mRecorder.setOrientationHint(270);
    } else {
        mRecorder.setOrientationHint(90);
    }

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

    // Step 2: Set sources
    mRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
    mRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);

    // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
    mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_480P));

    // Step 4: Set output file
    final File folder;
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        folder = new File(Environment.getExternalStorageDirectory() + "/CameraApp/Videos");
    } else {
        folder = new File(Environment.getExternalStorageDirectory() + "/CameraApp/Videos");
    }

    boolean success = true;
    File videoFile;
    if (!folder.exists()) {
        success = folder.mkdirs();
    }
    if (success) {
        videoFile = new File(folder.getAbsolutePath() + File.separator + getFileNameCustomFormat() + " " + ".mp4");

        SavedVideoPath = getFileNameCustomFormat() + " " + ".mp4";
        Log.e("Video Path - ", SavedVideoPath);
    } else {
        Toast.makeText(getBaseContext(), "Video Not saved", Toast.LENGTH_SHORT).show();
        return true;
    }
    mRecorder.setOutputFile(String.valueOf(videoFile));

    // mRecorder.setVideoSize(mPreviewWidth, mPreviewHeight);

    // Step 5: Set the preview output
    mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());

    // Step 6: Prepare configured MediaRecorder
    try {
        mRecorder.prepare();
    } catch (IllegalStateException e) {
        Toast.makeText(getApplicationContext(), "prepareVideoRecorder() Exception: " + e.getMessage(), Toast.LENGTH_LONG).show();
        releaseMediaRecorder();
        return false;
    } catch (IOException e) {
        Toast.makeText(getApplicationContext(), "prepareVideoRecorder() Exception: " + e.getMessage(), Toast.LENGTH_LONG).show();
        releaseMediaRecorder();
        return false;
    }
    return true;
}

让我知道会发生什么。？在尝试我的代码后。希望这会有所帮助：