Android 视频录制 java.lang.RuntimeException: start failed.

            //mRecorder.setVideoSize(320, 280);  
            // mRecorder.setVideoFrameRate(5);  
            mRecorder.setOutputFile(viodFile.getAbsolutePath());  
            // 指定SurfaceView来预览视频  
            mRecorder.setPreviewDisplay(sView.getHolder().getSurface());  
            mRecorder.prepare();  
            // 开始录制  

//mRecorder.setVideoSize(320, 280);  
// mRecorder.setVideoFrameRate(5);