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• Cannot find installation of real FFmpeg (which comes with ffprobe)

  29 mars 2023, par Asm Goni

  I was trying to fit a generator into a model and I got this error : 
AssertionError: Cannot find installation of real FFmpeg (which comes with ffprobe).

  



  I have looked over many of the solutions on GitHub and other questions on Stack Overflow but none of them worked for me.

  



  Here is one of the commands I ran :

  



  sudo add-apt-repository ppa:mc3man/trusty-media  
sudo apt-get update  
sudo apt-get install ffmpeg  
sudo apt-get install frei0r-plugins  


  



  pip list also indicates the presence of ffmpeg-1.4

  



  In addition, I tried force reinstalling and updating ffmpeg just in case any dependencies were not installed properly.

  



  I also set the skvideo's path for ffmpeg manually :

  



  skvideo.setFFmpegPath('/usr/local/lib/python3.6/dist-packages/ffmpeg/')


  



  This returns : /usr/local/lib/python3.6/dist-packages/skvideo/__init__.py:306: UserWarning: ffmpeg/ffprobe not found in path: /usr/local/lib/python3.6/dist-packages/ffmpeg/
  warnings.warn("ffmpeg/ffprobe not found in path: " + str(path), UserWarning)

  



  By the way, when I try installing, it also returns this error, I don't know what to do about this :

  



  Get:127 http://archive.ubuntu.com/ubuntu bionic/main amd64 vdpau-driver-all amd64 1.1.1-3ubuntu1 [4,674 B]
Fetched 60.4 MB in 7s (8,769 kB/s)
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/w/wavpack/libwavpack1_5.1.0-2ubuntu1.1_amd64.deb  404  Not Found [IP: 91.189.88.149 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?


  



  I ran apt-get update --fix-missing and that didn't make anything better.

  



  Is there a solution to this ?

  


• handling subprocess file output

  14 janvier 2019, par Sandip Kumar

  I am working on a project in which at some point user uploads a video and in backend i have to generate thumbnail for that video. I preferred ffmpeg for this purpose and the system is in django environment.
  This is my view function

  def upload(request):
  
      if request.method == 'POST':
  
          form = DocumentForm(request.POST, request.FILES)
  
          if form.is_valid():
  
              newdoc = Document(docfile=request.FILES['docfile'])
  
              filename = str(request.FILES['docfile'].name)
  
              newdoc.save()
  
              op = subprocess.call(['ffmpeg', '-i',"media/private/"+up, '-ss', '00:00:03.000', '-vframes', '1', 'abc.jpg']) // Generates thumbnail
  
              newdoc.thumbnail = op
  
              newdoc.save()
  
              return HttpResponseRedirect(reverse('list'))
  
      else:
  
          form = DocumentForm()

  The Document has the thumbnail field. I know that subprocess.call() returns returncode not any object so using op variable is useless. So my query is how do i save generated thumbnail in model.

• CMake on Ubuntu, Requested 'libavdevice' >= 56.4.100 but version of libavdevice is 53.2.0

  5 mars 2019, par user1830386

  I am trying to get into plug in writing for Gazebo but keep running into an error when compiling my programs.

  Requested 'libavdevice >= 56.4.100' but version of libavdevice is 53.2.0
  
  CMake Error at /usr/share/cmake- 
  
  3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  
  Could NOT find AVDEVICE (missing: AVDEVICE_FOUND) (Required is at least
  
  version "56.4.100")

  but when I do ffmpeg -version I get :

   libavdevice    57. 10.100 / 57. 10.100

  Yet CMake seems to think I’m on version 53. Trying to update ffmpeg or libavdevice-dev returns that I am on the latest version.

  Here is my make file :

  cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
  
  
  
  find_package(gazebo REQUIRED)
  
  include_directories(${GAZEBO_INCLUDE_DIRS})
  
  link_directories(${GAZEBO_LIBRARY_DIRS})
  
  list(APPEND CMAKE_CXX_FLAGS "${GAZEBO_CXX_FLAGS}")
  
  
  
  add_library(model_control SHARED model_control.cc)
  
  target_link_libraries(model_control ${GAZEBO_LIBRARIES})
  
  
  
  list(APPEND CMAKE_CXX_FLAGS "${GAZEBO_CXX_FLAGS}")

  and the cc file :

  #include <functional>
  
  #include <gazebo></gazebo>gazebo.hh>
  
  #include <gazebo></gazebo>physics/physics.hh>
  
  #include <gazebo></gazebo>common/common.hh>
  
  #include <ignition></ignition>math/Vector3.hh>
  
  
  
  namespace gazebo
  
  {
  
    class ModelPush : public ModelPlugin
  
    {
  
      public: void Load(physics::ModelPtr _parent, sdf::ElementPtr /*_sdf*/)
  
      {
  
        // Store the pointer to the model
  
        this->model = _parent;
  
  
  
        // Listen to the update event. This event is broadcast every
  
        // simulation iteration.
  
        this->updateConnection = event::Events::ConnectWorldUpdateBegin(
  
            std::bind(&amp;ModelPush::OnUpdate, this));
  
      }
  
  
  
      // Called by the world update start event
  
      public: void OnUpdate()
  
      {
  
        // Apply a small linear velocity to the model.
  
        this->model->SetLinearVel(ignition::math::Vector3d(.3, 0, 0));
  
      }
  
  
  
      // Pointer to the model
  
      private: physics::ModelPtr model;
  
  
  
      // Pointer to the update event connection
  
      private: event::ConnectionPtr updateConnection;
  
    };
  
  
  
    // Register this plugin with the simulator
  
    GZ_REGISTER_MODEL_PLUGIN(ModelPush)
  
  }
  
  </functional>

  Thanks !