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• SDL2 C++ Capturing Video of Renderer Animation/Sprite

  27 octobre 2016, par alok

  I have an animation/sprite created using SDL2. The animation works fine when it is being rendered to a screen. But now I also want it to be recorded into a video file (locally stored). For this, I am planning on using FFmpeg APIs, to which I’ll be sending a raw RGB pixel data array.

  My problem is with fetching the data from SDL2 APIs.

  What I’ve tried is :

  // From http://stackoverflow.com/questions/30157164/sdl-saving-window-as-bmp
  
  SDL_Surface *sshot = SDL_CreateRGBSurface(0, 750, 750, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
  
  SDL_RenderReadPixels(gRenderer, NULL, SDL_PIXELFORMAT_ARGB8888, sshot->pixels, sshot->pitch);
  
  
  
  // From https://wiki.libsdl.org/SDL_RWFromMem
  
  char fName[50];
  
  sprintf(fName, "/tmp/a/ss%03d.bmp", fileCnt);
  
  
  
  
  
  char bitmap[310000];
  
  SDL_RWops *rw = SDL_RWFromMem(bitmap, sizeof(bitmap));
  
  SDL_SaveBMP_RW(sshot, rw, 1); 

  Above does not work. But dumping a single frame into a file with following code works :

  SDL_SaveBMP(sshot, "/tmp/alok1/ss.bmp")

  This obviously is not an acceptable solution - Writing to thousands of BMPs and then using FFmpeg from command-line to create a video.

  What am I doing wrong ? How do you extract data from SDL_RWops ? Is the use of SDL_RWFromMem the right approach to my problem statement ?

• How to install libavcodec and libavutil from its source in linux

  25 janvier 2017, par neckTwi

  FFMPEG is providing libavutil and libavcodec libraries. While compiling and installing ffmpeg as described at https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu I can find libavcodec and libavutil folders in the ffmpeg source folder. I want to install these libraries to use them in my c++ programs. But there are no Makefiles in these folders. How can I install them ?

• How to install libavcodec and libavutil from its source in linux

  25 septembre 2020, par Necktwi

  FFMPEG is providing libavutil and libavcodec libraries. While compiling and installing ffmpeg as described at https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu I can find libavcodec and libavutil folders in the ffmpeg source folder. I want to install these libraries to use them in my c++ programs. But there are no Makefiles in these folders. How can I install them ?