Android MediaRecorder创建空文件

Question

我正在使用MediaRecorder通过前置摄像头录制视频。这适用于我测试的大多数手机，但在Galaxy S3上，预览是空白的，它不记录任何视频（保存空的32字节文件）。

以下是我对MediaRecorder的配置：

    @Override
    public void startRecord() {
            camera.stopPreview();
            recorder = new MediaRecorder();
            camera.unlock();

            recorder.setCamera(camera);

            recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

            recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            recorder.setVideoFrameRate(profile.videoFrameRate);
            recorder.setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight);
            recorder.setVideoEncodingBitRate(profile.videoBitRate);
            recorder.setAudioEncodingBitRate(profile.audioBitRate);
            recorder.setAudioChannels(profile.audioChannels);
            recorder.setAudioSamplingRate(profile.audioSampleRate);
            recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);

            recorder.setOutputFile(outputFile);
            recorder.setOrientationHint(orientation);

            try {
                    recorder.prepare();
            } catch (Exception e) {
            }
            recorder.start();
    }

我的代码有什么问题吗？