# FFMPEG

VTKExamples/Cxx/Video/FFMPEG

### Description

You must set VTK_USE_FFMPEG_ENCODER ON in your VTK build.

CMake won't find FFMPEG headers?

### Code

FFMPEG.cxx

    #include <vtkSmartPointer.h>
    #include <vtkImageCanvasSource2D.h>
    #include <vtkFFMPEGWriter.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<vtkFFMPEGWriter> writer =
          vtkSmartPointer<vtkFFMPEGWriter>::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(FFMPEG)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkIOFFMPEG
      vtkImagingSources QUIET)
    if (NOT VTK_FOUND)
      message("Skipping FFMPEG: ${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(FFMPEG MACOSX_BUNDLE FFMPEG.cxx )
      target_link_libraries(FFMPEG PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(FFMPEG MACOSX_BUNDLE FFMPEG.cxx )
      target_link_libraries(FFMPEG PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS FFMPEG
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build FFMPEG

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

    cd FFMPEG/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:

    ./FFMPEG

WINDOWS USERS

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