android - MediaRecorder start failing -

i start failed: -19 when try run following code, pretty sure have elements need begin video capture, have surfaceview set camera preview , below rest of code initialized in

   @override     public void surfacecreated( surfaceholder surfaceholder ) 

i e/mediarecorder﹕ start failed: -19 when trying run method starts recorder. there else need add before starting actual recorder?

    if(mcamera == null) {         mcamera = camera.open();         mcamera.unlock();      }      if(mrecorder == null)         mrecorder = new mediarecorder();      try {         mrecorder.setcamera( mcamera );         mrecorder.setvideosource(mediarecorder.videosource.camera);         mrecorder.setaudiosource(mediarecorder.audiosource.mic);         mrecorder.setoutputformat(mediarecorder.outputformat.mpeg_4);          //audio         mrecorder.setaudioencoder(mediarecorder.audioencoder.amr_nb);         //video         mrecorder.setvideoencoder(mediarecorder.videoencoder.mpeg_4_sp);         mrecorder.setvideosize(640, 480);         mrecorder.setvideoframerate( 15 );           mrecorder.setoutputfile( createnewfile() );         mrecorder.setpreviewdisplay( mholder.getsurface() );         mrecorder.setmaxduration(10000);      } catch (exception e) {         log.e( getstring( r.string.app_name ), "failed open camera" );         e.printstacktrace();     } 

then in button click method have mrecorder.prepare();mrecorder.start();.

edit

now getting error when try start recorder e/mediarecorder﹕ start failed: -2147483648 after setting video encoder before setting size.

another observation, have call startpreview() on camera object before starting recorder?

there few things wrong or missing:

1. mcamera.unlock() missing. has done before set camera in media recorder.
2. you have set video encoder before set video size.
3. mrecorder.setvideosize(640, 460) not work on devices. assuming want set vga format mrecorder.setvideosize(640, 480) assumes camera supports video in vga format. cameras not all. find out video size supported need check mcamera.getparameters().getsupportedvideosizes() , in case function returns null pointer need check mcamera.getparameters().getsupportedpreviewsizes().