OggTheora

VTKEx/Cxx/Video/OggTheora

Description¶

Other languages

See (Java)

Question

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Code¶

OggTheora.cxx

#include <vtkSmartPointer.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkOggTheoraWriter.h>

int main (int argc, char *argv[])
{
  vtkSmartPointer<vtkImageCanvasSource2D> source =
      vtkSmartPointer<vtkImageCanvasSource2D>::New();
  source->SetScalarTypeToUnsignedChar();
  source->SetNumberOfScalarComponents(3);
  source->SetExtent(0, 100, 0, 100, 0, 0);

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

  writer->SetInputConnection(source->GetOutputPort());
  writer->SetFileName("test.avi");
  writer->Start();

  for(unsigned int i = 0; i < 100; i++)
  {
    source->SetDrawColor(0,0,0,1); //black
    source->FillBox(0, 100, 0, 100); //clear image
    source->SetDrawColor(255,0,0,1); //red
    source->FillBox(i, 20, 10, 20);
    source->Update();

    writer->Write();
  }
  writer->End();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(OggTheora)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkIOOggTheora
  vtkvtkImagingSources QUIET)
if (NOT VTK_FOUND)
  message("Skipping OggTheora: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(OggTheora MACOSX_BUNDLE OggTheora.cxx )
  target_link_libraries(OggTheora PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(OggTheora MACOSX_BUNDLE OggTheora.cxx )
  target_link_libraries(OggTheora PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS OggTheora
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build OggTheora¶

Click here to download OggTheora and its CMakeLists.txt file. Once the tarball OggTheora.tar has been downloaded and extracted,

cd OggTheora/build

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./OggTheora

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.