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<p class=MsoNormal>Hello everyone,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m trying to use vtkMPEG2Writer to capture the frames
of a render window into a movie but I keep getting these errors:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line
61<o:p></o:p></p>
<p class=MsoNormal>horizontal_size must be a even [4:2:0/4:2:2]<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line
61<o:p></o:p></p>
<p class=MsoNormal>vertical_size must be a even [4:2:0]<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line
61<o:p></o:p></p>
<p class=MsoNormal>vertical _size must be a even [field pictures]<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Generic Warning: In \vtk-5.0.0\Io\vtkMPEG2Writer.cxx, line
61<o:p></o:p></p>
<p class=MsoNormal>vertical _size must be a multiple of 4 [4:2:0 field pictures]<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Courier New"'>void
Recorder::GrabFrame()<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkImageData * frame
= vtkImageData::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkUnsignedCharArray
* pData = vtkUnsignedCharArray::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkRenderWindow * rw
= GetRenderWindow();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> int * dim =
rw->GetSize();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> rw->GetRGBACharPixelData(1,1,dim[0]-1,dim[1]-1,1,pData);<span
style='color:green'><o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> frame->SetExtent(0,dim[0],0,dim[1],0,0);<span
style='color:blue'><o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> frame->SetScalarTypeToUnsignedChar();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> frame->SetNumberOfScalarComponents(4);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> frame->GetPointData()->SetScalars(pData);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>void Recorder::WriteFrame()<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>{ <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkMPEG2Writer *
mWriter = vtkMPEG2Writer::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> if(!started){<br>
mWriter->SetFileName(“d:\\testvideo.mpg”);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> mWriter->SetInput(frame);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> mWriter->Start();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> started
= TRUE;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> }else{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> mWriter->SetInput(frame);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> mWriter->Write();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>void Recorder::StopRecording()<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> mWriter->End();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoAutoSig>--<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoAutoSig><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Network
Administrator<o:p></o:p></span></p>
<p class=MsoAutoSig><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>In-Vivo
NMR Centre<o:p></o:p></span></p>
<p class=MsoAutoSig><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>University
of Alberta<o:p></o:p></span></p>
<p class=MsoAutoSig><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Phone:
(780) 492-8098<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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