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• 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 !

• avfilter : add grayworld video filter

  28 août 2021, par Paul Buxton

  avfilter : add grayworld video filter
  Implements a gray world color correction algorithm
  
  using a log scale LAB colorspace.
  Signed-off-by : Paul Buxton <paulbuxton.mail@googlemail.com>
  
  Signed-off-by : Paul B Mahol <onemda@gmail.com>
  

  • [DH] Changelog
  • [DH] doc/filters.texi
  • [DH] libavfilter/Makefile
  • [DH] libavfilter/allfilters.c
  • [DH] libavfilter/version.h
  • [DH] libavfilter/vf_grayworld.c

• DrawText and crossfade effect - ffmpeg

  22 juillet 2018, par Geek

  I have one video with crossfade effect and i want add text on this video (drawtext).
  However when i add a filter text, he remove a crossfade effect in the final video.

  Command to create video with crossfade effect :

  ffmpeg -i first.mp4 -i second.mp4 -filter_complex 
  
      "[0:v]trim=start=0:end=2,setpts=PTS-STARTPTS[0_clip_1];
  
      [0:v]trim=start=2:end=3,setpts=PTS-STARTPTS[fadeoutsrc_0];
  
      [fadeoutsrc_0]format=pix_fmts=yuva420p,fade=t=out:st=0:d=1:alpha=1[fadeout_0];
  
      [fadeout_0]fifo[fadeoutfifo_0];[1:v]trim=start=1,setpts=PTS-STARTPTS[1_clip_2];
  
      [1:v]trim=start=0:end=1,setpts=PTS-STARTPTS[fadeinsrc_1];
  
      [fadeinsrc_1]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1[fadein_1];
  
      [fadein_1]fifo[fadeinfifo_1];
  
      [fadeoutfifo_0][fadeinfifo_1]overlay[crossfade_1];
  
      [0_clip_1][crossfade_1][1_clip_2]concat=n=3[output];[0:a][1:a] acrossfade=d=1 [audio]" 
  
  -map "[output]" -map "[audio]" videoWithCrossfade.mp4

  Command to add filter text :

  ffmpeg -i videoWithCrossfade.mp4 -filter_complex 
  
      "/Windows/fonts/arial.ttf':text='hello world!':fontcolor=white:fontsize=40:box=1:boxcolor=red
  
      @0.5:boxborderw=10:x=500:y=500"
  
      output.mp4

  this is the link of video : http://www.mediafire.com/file/kw3lvdb2rp1bs6u/videoWithCrossfade.mp4/file
  http://www.mediafire.com/file/iycdzozsqzosq87/output.mp4/file

  Thanks for your help !