[vtkusers] Video output vtkOggTheoraWriter

[Emma Saunders]

Hi All,

I am attempting to output video from a rendered moving sphere using
vtkOggTheoraWriter and windowToImageFilter.  I can output a series of png
files but when attempting to write the video the quality is checkered, does
this have anything to do with the size, or frame rate?  Any advice
appreciated, below is my code.


int main(int, char *[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetCenter(0.0, 0.0, 0.0);
  sphereSource->SetRadius(5.0);
  sphereSource->Update();

  // Visualize
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(sphereSource->GetOutputPort());

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
   vtkSmartPointer<vtkRenderWindowInteractor>::New();
    int *size1 = renderWindow->GetSize();
    renderWindow->SetSize(size1[0]/2, size1[1]/2);

  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderer->AddActor(actor);
  renderWindow->Render();

  // Screenshot
  vtkSmartPointer<vtkWindowToImageFilter> windowToImageFilter =
    vtkSmartPointer<vtkWindowToImageFilter>::New();
  windowToImageFilter->SetInput(renderWindow);
  windowToImageFilter->SetMagnification(1);
  windowToImageFilter->SetInputBufferTypeToRGBA();
  windowToImageFilter->ReadFrontBufferOff();
  windowToImageFilter->Update();


  vtkSmartPointer<vtkOggTheoraWriter> writer =
  vtkSmartPointer<vtkOggTheoraWriter>::New();

  writer->SetInputConnection(windowToImageFilter->GetOutputPort());
  writer->SetFileName("output.mp4");

   writer->Start();

  int i;

  char filenames[16];
  for(i=0;i<10;i++)
  {
  actor->RotateY(5);
  renderer->ResetCameraClippingRange();
  renderWindow->Render();
  windowToImageFilter->SetInput(renderWindow);
  renderer->ResetCamera();
  windowToImageFilter->Modified();
  windowToImageFilter->Update();
  writer->Write();
 }

 writer->End();


  return EXIT_SUCCESS;
}
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