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• Anomalie #4052 : Visualiser ses messages dans le privé

  28 novembre 2017, par tcharlss (*´_ゝ｀)

  J’ai bien ce lien sur contrib, spip.net et forum. C’est tout en bas de la boîte d’infos :

  AUTEUR NUMÉRO
  6944
  Je suis rédacteur
  
  4 articles
  
  24 messages de forum
  
  Voir en ligne
  

• FFmpeg find_package not found

  28 mai 2024, par YoungCoder

  CMake cannot find FFmpeg even though everything is right setup. I used vcpkg to install ffmpeg
I can't find any information to setup ffmpeg with CMake. I'm on Windows 10 with Visual Studio.

  


  Get findFFMPEG and put in ffmpeg folder but doesn't solve the issue. change the folder name to
FFMPEG capital letters but still doesn't solve the issue.

  


  I get this error :
Severity Code Description Project File Line Suppression State Details
Error CMake Error at CMakeProject1/CMakeLists.txt:15 (find_package) :
By not providing "FindFFMPEG.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "FFMPEG", but
CMake did not find one.

  


  Could not find a package configuration file provided by "FFMPEG" with any
of the following names :

  


  FFMPEGConfig.cmake
ffmpeg-config.cmake


  


  Add the installation prefix of "FFMPEG" to CMAKE_PREFIX_PATH or set
"FFMPEG_DIR" to a directory containing one of the above files. If "FFMPEG"
provides a separate development package or SDK, be sure it has been
installed. C :\Users\Enriqurfrankie\source\repos\CMakeProject1\CMakeProject1/CMakeLists.txt 15

  


  add_executable (CMakeProject1 "Source/Main.cpp" "Source/SDL2_Init.cpp" "Header/SDL2_Init.h")

target_include_directories(CMakeProject1 PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/Header")

find_package(SDL2 REQUIRED)
find_package(SDL2_image REQUIRED)
find_package(SDL2_ttf REQUIRED)
find_package(SDL2_mixer REQUIRED)
find_package(FFMPEG REQUIRED)

if (CMAKE_VERSION VERSION_GREATER 3.12)
  set_property(TARGET CMakeProject1 PROPERTY CXX_STANDARD 20)
endif()


  


• Ghost image issues with ffmpeg -filter_complex displace

  5 juillet 2022, par raul.vila

  I've (almost) been able to apply a displacement based on 2 animated gaussian noise videos, but I'm having issues with a ghost image. A picture is worth a thousand words.

  


  Here you have a script to replicate the issue :

  


  ffmpeg -y -t 2 -f lavfi -i color=c=blue:s=160x120 -c:v libx264 -tune stillimage -pix_fmt rgb24 00_empty.mp4
ffmpeg -y -i 00_empty.mp4 -vf "drawtext=text=string1:y=h/2:x=w-t*w/2:fontcolor=white:fontsize=60" 01_text.mp4
ffmpeg -y -t 2 -f lavfi -i color=c=gray:s=160x120 -c:v libx264 -tune stillimage -pix_fmt rgb24 02_gray.mp4
ffmpeg -y -i 01_text.mp4 -i 02_gray.mp4 -i 02_gray.mp4 -filter_complex "[0][1][2]displace=edge=mirror" 03_displaced_text.mp4


  


  It creates a test video with a scrolling text and a gray dummy video. Then it applies a displacement based on the gray video. If I understand correctly, because the gray video is 100% gray, it should leave the video unchanged (or maybe displace everything by a fixed ammount of pixels), but it creates a "shadow". I tried with 3 different pixel formats (yuv420p, yuv444p, rgb24) because I found this question on stackoverflow talking about that :

  


  

  • Why are Cb and Cr planes displaced differently from lum by the displace complex filter in ffmpeg ?

  


  


  ffmpeg version 5.0.1-full_build-www.gyan.dev

  


  Any idea will be welcome.
  
Thanks !