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
来源：https://stackoverflow.com/questions/18402649/media-recorder-start-failed-in-android-for-camera