[vtkusers] vtkMPEG2Writer

[Wylie, Brian]

In this case, unlike many others, the error messages are actually giving
you good information. :)
 
The mpeg encoders have to have multiples of 2 or multiple of 4 in the
image size of the movies it generates.
 
Grab the size of the render window with GetSize(), and then resize the
window (probably smaller) to the next multiple of 4 in both directions,
I'm assuming with SetSize(). Then it should work ok. :)
 

  Brian Wylie - Org 1424
  Sandia National Laboratories
  MS 0822 - Building 880/A1-J
  (505)844-2238 FAX(505)845-0833                      
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                                    Unleash the Beast


 


________________________________

	From: vtkusers-bounces+bnwylie=sandia.gov at vtk.org
[mailto:vtkusers-bounces+bnwylie=sandia.gov at vtk.org] On Behalf Of Beau
Sapach
	Sent: Monday, July 31, 2006 1:37 PM
	To: vtkusers at vtk.org
	Subject: [vtkusers] vtkMPEG2Writer
	
	

	Hello everyone,

	 

	I'm trying to use vtkMPEG2Writer to capture the frames of a
render window into a movie but I keep getting these errors:

	 

	Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line 61

	horizontal_size must be a even [4:2:0/4:2:2]

	 

	Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line 61

	vertical_size must be a even [4:2:0]

	 

	Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line 61

	vertical _size must be a even [field pictures]

	 

	Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line 61

	vertical _size must be a multiple of 4 [4:2:0 field pictures]

	 

	 

	Here is the code behind my Recorder object.  This is somewhat
simplified so I'm sure if it were compiled would cause some problems, I
can already see one memory leak.  Nonetheless, if anyone sees any
obvious problems with this, please let me know!  The functions are
called in the order they are presented.

	 

	 

	void Recorder::GrabFrame()

	{

	      vtkImageData * frame = vtkImageData::New();

	      vtkUnsignedCharArray * pData =
vtkUnsignedCharArray::New();

	      vtkRenderWindow * rw = GetRenderWindow();

	      

	      int * dim = rw->GetSize();

	      

	      rw->GetRGBACharPixelData(1,1,dim[0]-1,dim[1]-1,1,pData);

	      frame->SetExtent(0,dim[0],0,dim[1],0,0);

	      frame->SetScalarTypeToUnsignedChar();

	      frame->SetNumberOfScalarComponents(4);

	      frame->GetPointData()->SetScalars(pData);

	}

	 

	void Recorder::WriteFrame()

	{           

	      vtkMPEG2Writer * mWriter = vtkMPEG2Writer::New();

	 

	      if(!started){
	            mWriter->SetFileName("d:\\testvideo.mpg");

	            mWriter->SetInput(frame);

	            mWriter->Start();

	            started = TRUE;

	      }else{

	            mWriter->SetInput(frame);

	            mWriter->Write();

	      }

	 

	}

	 

	void Recorder::StopRecording()

	{

	      mWriter->End();

	}

	 

	 

	 

	--

	Network Administrator

	In-Vivo NMR Centre

	University of Alberta

	Phone: (780) 492-8098

	 

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