我在使用 Android 上的 MediaRecorder 将视频保存到 SD 卡时遇到问题。

我的代码一直运行，直到我到达将配置文件设置为高质量的行。

这是我的代码:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.activity_sample_testing);
        // Show the Up button in the action bar.
        //setupActionBar();
        overridePendingTransition(0, 0);

        SurfaceView cameraView = (SurfaceView)findViewById(R.id.videoView1);

        holder = cameraView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        intentTestResults = new Intent(this, TestResultsAct.class);

        TestPB = (ProgressBar) findViewById(R.id.ProgressBarTest);

        new Thread(new Runnable() {

            @Override
            public void run() {
                while(mProgressStatus < 100){
                    if(mProgressStatus == 1)
                        record();
                    if(mProgressStatus == 35)
                        record();
                    mProgressStatus += 1;
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            TestPB.setProgress(mProgressStatus);
                        }
                    });
                }
            }
        }).start();
        //
    }

同时

 private void initRecorder() {
        camera.unlock();

        recorder.setCamera(camera);
        recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        CamcorderProfile cpHigh = CamcorderProfile
                .get(CamcorderProfile.QUALITY_HIGH);
        recorder.setProfile(cpHigh);
        recorder.setOutputFile(Environment.getExternalStorageDirectory() + "/DCIM/Frames/videocapture_example.mp4");
        recorder.setMaxDuration(50000); // 50 seconds
        recorder.setMaxFileSize(300000000); // Approximately 5 megabytes
    }
    private void prepareRecorder() {
        recorder.setPreviewDisplay(holder.getSurface());
        try {
            recorder.prepare();
        } catch (IllegalStateException e) {
            e.printStackTrace();
            finish();
        } catch (IOException e) {
            e.printStackTrace();
            finish();
        }
    }

    void record()
    {
        if (recording) {
            recorder.stop();
            recording = false;
            camera.lock();
            parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
            camera.setParameters(parameters);
            camera.unlock();
            recorder.release();
            //finish();
        } else {
            recording = true;
            initRecorder();
            prepareRecorder();
            recorder.start();
        }
    }

我的问题出现在这一行之后:recorder.setProfile(cpHigh);

这是日志:

12-26 10:37:43.670: E/MediaRecorder(6046): try to set the audio encoder without setting the audio source first
    12-26 10:38:35.150: W/dalvikvm(6046): threadid=11: thread exiting with uncaught exception (group=0x40fee2a0)
    12-26 10:38:37.065: E/AndroidRuntime(6046): FATAL EXCEPTION: Thread-794
    12-26 10:38:37.065: E/AndroidRuntime(6046): java.lang.IllegalStateException
    12-26 10:38:37.065: E/AndroidRuntime(6046):     at android.media.MediaRecorder.setAudioEncoder(Native Method)
    12-26 10:38:37.065: E/AndroidRuntime(6046):     at android.media.MediaRecorder.setProfile(MediaRecorder.java:370)
    12-26 10:38:37.065: E/AndroidRuntime(6046):     at com.example.homedevice.SampleTestingAct.initRecorder(SampleTestingAct.java:124)
    12-26 10:38:37.065: E/AndroidRuntime(6046):     at com.example.homedevice.SampleTestingAct.record(SampleTestingAct.java:155)
    12-26 10:38:37.065: E/AndroidRuntime(6046):     at com.example.homedevice.SampleTestingAct$2.run(SampleTestingAct.java:90)
    12-26 10:38:37.065: E/AndroidRuntime(6046):     at java.lang.Thread.run(Thread.java:856)
    12-26 10:38:47.555: E/MediaRecorder(6046): stop called in an invalid state: 4

写入的异常是: java.lang.IllegalStateException

我做错了什么？

EDIT1(有声音许可):

private void initRecorder() {
    camera.unlock();

    recorder.setCamera(camera);
    recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
    recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    //recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 
    //recorder.setVideoSize(1920, 1080);
    //recorder.setVideoFrameRate(30);
    CamcorderProfile cpHigh = CamcorderProfile
            .get(CamcorderProfile.QUALITY_HIGH);
    recorder.setProfile(cpHigh);
    recorder.setOutputFile(Environment.getExternalStorageDirectory() + "/DCIM/Frames/videocapture_example.mp4");
    recorder.setMaxDuration(50000); // 50 seconds
    recorder.setMaxFileSize(300000000); // Approximately 5 megabytes
}

编辑 2(logcat) : 这是日志

    12-26 11:32:43.170: E/AndroidRuntime(18552): FATAL EXCEPTION: Thread-1016
12-26 11:32:43.170: E/AndroidRuntime(18552): java.lang.IllegalStateException
12-26 11:32:43.170: E/AndroidRuntime(18552):    at android.media.MediaRecorder.setOutputFormat(Native Method)
12-26 11:32:43.170: E/AndroidRuntime(18552):    at android.media.MediaRecorder.setProfile(MediaRecorder.java:357)
12-26 11:32:43.170: E/AndroidRuntime(18552):    at com.example.homedevice.SampleTestingAct.initRecorder(SampleTestingAct.java:127)
12-26 11:32:43.170: E/AndroidRuntime(18552):    at com.example.homedevice.SampleTestingAct.record(SampleTestingAct.java:158)
12-26 11:32:43.170: E/AndroidRuntime(18552):    at com.example.homedevice.SampleTestingAct$2.run(SampleTestingAct.java:90)
12-26 11:32:43.170: E/AndroidRuntime(18552):    at java.lang.Thread.run(Thread.java:856)
setOutputFormat called in an invalid state: 4
threadid=11: thread exiting with uncaught exception (group=0x40fee2a0).

最佳答案

setProfile() 函数。

It always calls setAudioEncoder() so if you don't set the audio source it will crash.

尝试将其包含在您的代码中:

recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT); 
recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); 

recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); 

解释:

CamcorderProfile 还设置音频属性(例如编解码器、比特率、采样率等)，因此您需要在调用它之前设置音频源，这就是应用程序崩溃的原因。如果您不想录制音频，请尝试下一个代码:

recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
recorder.setVideoSize(WIDTH, HEIGHT);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
recorder.setOutputFile(PATH);
recorder.setPreviewDisplay(SURFACE);

recorder.prepare();
recorder.start();

关于Android MediaRecorder 在设置配置文件后崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20781763/