Skip to content

FFMPEG

Repository source: FFMPEG

Description

You must set VTK_USE_FFMPEG_ENCODER ON in your VTK build.

CMake won't find FFMPEG headers?

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

FFMPEG.cxx

#include <vtkFFMPEGWriter.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkNew.h>

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

  vtkNew<vtkFFMPEGWriter> writer;

  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 3.12 FATAL_ERROR)

project(FFMPEG)

find_package(VTK COMPONENTS 
  CommonCore
  IOFFMPEG
  ImagingSources
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "FFMPEG: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
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}
)

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.