Media Recorder start failed in android for camera

问题:

I am working on video recording app in which i want to display preview and when user click on record button it start recording and when user click stop button it stop recording.

I got video preview on my surface but when i press start button it crash with error "MEDIA.RECORDER.START(Native MEthod). Here is my code Please help me guys.

  @Override     public void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);             setContentView(R.layout.activity_main);             surfaceView = (SurfaceView) findViewById(R.id.surface_camera);             surfaceHolder = surfaceView.getHolder();             surfaceHolder.addCallback(this);             surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);             Button start =(Button)findViewById(R.id.start);             Button stop =(Button)findViewById(R.id.stop);             stop.setOnClickListener(new OnClickListener() {                  @Override                 public void onClick(View v) {                     // TODO Auto-generated method stub                     camera.stopPreview();                     stopRecording();                 }             });             start.setOnClickListener(new OnClickListener() {                  @Override                 public void onClick(View v) {                     // TODO Auto-generated method stub                     startRecording();                 }             });     }      @Override public void surfaceCreated(SurfaceHolder holder) {     camera = Camera.open();     if (camera != null){         Camera.Parameters params = camera.getParameters();         camera.setParameters(params);     }     else {         Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();         finish();     } }  @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {     if (previewRunning){         camera.stopPreview();     }     Camera.Parameters p = camera.getParameters();      List<Camera.Size> sizes = p.getSupportedPreviewSizes();       Camera.Size cs = sizes.get(0);        p.setPreviewSize(cs.width, cs.height);          camera.setParameters(p);      try {         camera.setPreviewDisplay(holder);         camera.startPreview();         previewRunning = true;     }     catch (IOException e) {         Log.e(TAG,e.getMessage());         e.printStackTrace();     } }   private MediaRecorder mediaRecorder;     private final int maxDurationInMs = 20000;     private final long maxFileSizeInBytes = 500000;     private final int videoFramesPerSecond = 20;      public boolean startRecording(){         try {             camera.unlock();              mediaRecorder = new MediaRecorder();              mediaRecorder.setCamera(camera);             mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);             mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);              mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);              mediaRecorder.setMaxDuration(maxDurationInMs);          File tempFile = new File(getCacheDir(),"test.mp4");             mediaRecorder.setOutputFile(tempFile.getPath());              mediaRecorder.setVideoFrameRate(videoFramesPerSecond);             mediaRecorder.setVideoSize(surfaceView.getWidth(), surfaceView.getHeight());              mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);             mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);              mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());              mediaRecorder.setMaxFileSize(maxFileSizeInBytes);                          mediaRecorder.prepare();             mediaRecorder.start();              return true;         } catch (IllegalStateException e) {             Log.e(TAG,e.getMessage());             e.printStackTrace();             return false;         } catch (IOException e) {             Log.e(TAG,e.getMessage());             e.printStackTrace();             return false;         }     }      public void stopRecording(){         mediaRecorder.stop();         camera.lock();     }  @Override public void surfaceDestroyed(SurfaceHolder holder) {     camera.stopPreview();     previewRunning = false;     camera.release(); } 

}

Log is

 08-31 02:20:11.781: E/MediaRecorder(14519): start failed: -19  08-31 02:20:11.781: D/AndroidRuntime(14519): Shutting down VM  08-31 02:20:11.781: W/dalvikvm(14519): threadid=1: thread exiting with uncaught exception (group=0x416c9700)  08-31 02:20:11.781: E/AndroidRuntime(14519): FATAL EXCEPTION: main  08-31 02:20:11.781: E/AndroidRuntime(14519): java.lang.RuntimeException: start failed.  08-31 02:20:11.781: E/AndroidRuntime(14519):   at android.media.MediaRecorder.start(Native Method)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at com.example.cameratest.MainActivity.startRecording(MainActivity.java:135)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at com.example.cameratest.MainActivity$2.onClick(MainActivity.java:61)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at android.view.View.performClick(View.java:4240)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at android.view.View$PerformClick.run(View.java:17721)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at android.os.Handler.handleCallback(Handler.java:730)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at android.os.Handler.dispatchMessage(Handler.java:92)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at android.os.Looper.loop(Looper.java:137)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at android.app.ActivityThread.main(ActivityThread.java:5103)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at java.lang.reflect.Method.invokeNative(Native Method) 08-31 02:20:11.781: E/AndroidRuntime(14519):    at java.lang.reflect.Method.invoke(Method.java:525) 08-31 02:20:11.781: E/AndroidRuntime(14519):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 08-31 02:20:11.781: E/AndroidRuntime(14519):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)  08-31 02:20:11.781: E/AndroidRuntime(14519):   at dalvik.system.NativeStart.main(Native Method) 

回答1:

I Found This solution and its working fine for me and solved this problem :)

for 2.3+ android:

Just change:

mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH)); 

to:

mediaRecorder.setProfile(CamcorderProfile.get(CameraID,CamcorderProfile.QUALITY_HIGH)); 

回答2:

in your startRecording method try to lock camera before you unlock it:

mediaRecorder = new MediaRecorder(); camera.lock(); camera.unlock(); 

回答3:

comment this line of code,

mediaRecorder.setVideoSize(surfaceView.getWidth(), surfaceView.getHeight()); 

回答4:

I have solved the start failed error -19 by changing the videoFramesPerSecond value as 30. which is the recommended value for QUALITY_1080p-Quality level corresponding to the 1080p (1920 x 1080) resolution and QUALITY_480P- Quality level corresponding to the 480p (720 x 480) resolution.

source: http://developer.android.com/guide/appendix/media-formats.html

回答5:

Try following may be it work : help to anybody :

        try {             mediaRecorder.prepare();             Thread.sleep(1000);         } catch (Exception e) {             // TODO: handle exception             e.printStackTrace();         }         mediaRecorder.start(); 

For incoming call it was taking time to prepare.

Hold the prepare for 1 sec and everything is worked fine.

回答6:

This may be a lot less complicated than you think. Android has done a lot of the leg work for something as simple as recording and returning the video file by using Intents...

Record a Video with a Camera App The Android way of delegating actions to other applications is to invoke an Intent that describes what you want done. This involves three pieces: the Intent itself, a call to start the external Activity, and some code to handle the video when focus returns to your activity.

Here's a function that invokes an intent to capture video.

private void dispatchTakeVideoIntent() { Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE); startActivityForResult(takeVideoIntent, ACTION_TAKE_VIDEO); } 

View the Video The Android Camera application returns the video in the Intent delivered to onActivityResult() as a Uri pointing to the video location in storage. The following code retrieves this video and displays it in a VideoView.

private void handleCameraVideo(Intent intent) { mVideoUri = intent.getData(); mVideoView.setVideoURI(mVideoUri); } 

Add this to the Manifest

<uses-feature android:name="android.hardware.camera" /> 

source: http://developer.android.com/training/camera/videobasics.html

文章来源: Media Recorder start failed in android for camera