我有一个MediaRecorder录制视频，我对setCaptureRate()的效果很迷惑.具体来说，我按如下方式准备我的MediaRecorder:mMediaRecorder=newMediaRecorder();mCamera.stopPreview();mCamera.unlock();mMediaRecorder.setCamera(mCamera);mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);mMediaRecorder.setProfile(CamcorderProfile.QUALIT