Android 罕见的摄像机记录中视频亮度下降（暗淡）

为什么在稀有相机中录制视频时亮度变低？图像很好

下面是我为视频准备mediarecorder的代码。请帮忙

try {
        // Step 1: Unlock and set camera to MediaRecorder
        mCamera.unlock();
        mVideoMediaRecorder.setCamera(mCamera);
        // Step 2: Set sources
        mVideoMediaRecorder.setAudioSource     (MediaRecorder.AudioSource.CAMCORDER);
        mVideoMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

        // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
        mVideoMediaRecorder.setProfile(CamcorderProfile.get(mCurrentCameraId, CamcorderProfile.QUALITY_HIGH));
        mVideoMediaRecorder.setVideoSize(mCameraPreview.getVideoSize().width, mCameraPreview.getVideoSize().height);

mVideoMediaRecorder.setOutputFile（mVideoPath）

---

发生在某些设备上，例如：Lenovo TAB3&Essential。发生在某些设备上，例如：Lenovo TAB3&Essential。

        // Step 5: Set the preview output
        mVideoMediaRecorder.setPreviewDisplay(mCameraPreview.getSurfaceHolder().getSurface());
        mVideoMediaRecorder.setOrientationHint(mCameraPreview.getPreviewOrientation());

        // Step 6: Prepare configured MediaRecorder
        try {
            mVideoMediaRecorder.prepare();
        } catch (IllegalStateException e) {