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• Cannot create SDL_Window giving SDL_Main.h error even though included

  27 février 2015, par user2270995

  I am trying to play network stream using FFMPEG(Fetching, decoding.etc) and trying to render it using SDL.

  When I run my Application it starts normally but as soon as I call OpenFile() which contains code for opening network stream and creating SDL_Window and then SDL_Renderer but it gives me a error on SDL_CreateWindow() saying :

  Window not created: [Application didn't initialize properly, did you include SDL_main.h in the file containing your main() function?].

  Even though I have included SDL_main.h.

  #include 
  
  #include 
  
  ..... //other header files
  
  
  
  #define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
  
  #define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
  
  
  
  SDL_Window *window;
  
  SDL_Renderer *renderer;
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER))
  
      {
  
        LOGE("Could not initialize SDL - %s\n", SDL_GetError());
  
        exit(1);
  
      }
  
      return 0;
  
   }
  
  
  
   void Java_com_my_app_MainActivity_openFile(JNIEnv * env, jobject this, jstring url)
  
   {
  
      ......
  
      ...... //FFMPEG code
  
  
  
    //---------------------------SDL part -------------------------//
  
  
  
    window = SDL_CreateWindow("Window", SDL_WINDOWPOS_UNDEFINED,
  
             SDL_WINDOWPOS_UNDEFINED, 0, 0,
  
             SDL_WINDOW_SHOWN | SDL_WINDOW_FULLSCREEN);
  
  
  
     if(window == NULL)
  
     {
  
         LOGE("Window not created: [%s]", SDL_GetError());
  
         return;
  
     }
  
     LOGE("Window created");
  
  
  
    renderer = SDL_CreateRenderer(window,-1,SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE);
  
     if(renderer == NULL)
  
     {
  
         LOGE("renderer not created: [%s]", SDL_GetError());
  
         return;
  
     }
  
     LOGE("Rendering Created...");
  
  }

  Here’s code from another project i tried (following this tutorial) in which i do not in my MainActivity and i works fine

     #include 
  
     #include 
  
     #include 
  
  
  
     #include "SDL.h"
  
  
  
   typedef struct Sprite
  
   {
  
     SDL_Texture* texture;
  
     Uint16 w;
  
     Uint16 h;
  
   } Sprite;
  
  
  
  Sprite LoadSprite(const char* file, SDL_Renderer* renderer)
  
  {
  
      Sprite result;
  
      result.texture = NULL;
  
      result.w = 0;
  
      result.h = 0;
  
  
  
      SDL_Surface* temp;
  
  
  
      /* Load the sprite image */
  
      temp = SDL_LoadBMP(file);
  
      if (temp == NULL)
  
      {
  
          fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError());
  
          return result;
  
      }
  
      result.w = temp->w;
  
      result.h = temp->h;
  
  
  
      /* Create texture from the image */
  
      result.texture = SDL_CreateTextureFromSurface(renderer, temp);
  
      if (!result.texture) {
  
          fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());
  
          SDL_FreeSurface(temp);
  
          return result;
  
      }
  
      SDL_FreeSurface(temp);
  
  
  
      return result;
  
  }
  
  
  
  void draw(SDL_Window* window, SDL_Renderer* renderer, const Sprite sprite)
  
  {
  
      int w, h;
  
      SDL_GetWindowSize(window, &w, &h);
  
      SDL_Rect destRect = {w/2 - sprite.w/2, h/2 - sprite.h/2, sprite.w, sprite.h};
  
      /* Blit the sprite onto the screen */
  
      SDL_RenderCopy(renderer, sprite.texture, NULL, &destRect);
  
  }
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER))
  
      {
  
           fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
  
           exit(1);
  
      }
  
  
  
      SDL_Window *window;
  
      SDL_Renderer *renderer;
  
  
  
      if(SDL_CreateWindowAndRenderer(0, 0, 0, &window, &renderer) < 0)
  
          exit(2);
  
  
  
      Sprite sprite = LoadSprite("image.bmp", renderer);
  
      if(sprite.texture == NULL)
  
          exit(2);
  
  
  
      /* Main render loop */
  
      Uint8 done = 0;
  
      SDL_Event event;
  
      while(!done)
  
      {
  
          /* Check for events */
  
          while(SDL_PollEvent(&event))
  
          {
  
              if(event.type == SDL_QUIT || event.type == SDL_KEYDOWN )//|| event.type == SDL_FINGERDOWN)
  
              {
  
                  done = 1;
  
              }
  
          }
  
  
  
  
  
      /* Draw a gray background */
  
      SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
  
      SDL_RenderClear(renderer);
  
  
  
      draw(window, renderer, sprite);
  
  
  
      /* Update the screen! */
  
      SDL_RenderPresent(renderer);
  
  
  
      SDL_Delay(10);
  
  }
  
  
  
  exit(0);
  
  
  
  }

  Note : I created the first project (the one giving error) from this fine working project

  I have tried removing SDL_main.h’, using #undef main but none of it works. Now it has started giving me a error Saying 'java.lang.UnsatisfiedLinkError: Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "SDL_main" referenced by "libmain.so"...

  My Android.mk

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := ffmpeg
  
  LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libffmpeg.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(TARGET_ARCH_ABI)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  
  
  include $(CLEAR_VARS)
  
  SDL_PATH := ../SDL
  
  MY_FILES_PATH := ../src
  
  LOCAL_MODULE    := main
  
  # Add your application source files here...
  
  LOCAL_SRC_FILES := $(SDL_PATH)/src/main/android/SDL_android_main.c \
  
                     $(patsubst $(LOCAL_PATH)/%, %, $(wildcard $(LOCAL_PATH)/src/*.c)) 
  
  
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/$(SDL_PATH)/include
  
  LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -ljnigraphics -lGLESv1_CM -lGLESv2 -llog -lz -lm 
  
  LOCAL_ALLOW_UNDEFINED_SYMBOLS := true
  
  LOCAL_SHARED_LIBRARIES := SDL2
  
  LOCAL_SHARED_LIBRARIES += ffmpeg 
  
  include $(BUILD_SHARED_LIBRARY)

• FFMPEG - how to add a text and crop a video at the same time

  18 janvier 2023, par ProgramadorLIXO

  Im trying to learn FFMPEG.
I am having trouble figuring out how to add a text on top of a cropped video with only one line code.

  


  I want to know how to do both at the same time !

  


  I tried something but it did not work.

  


  This is what I tried :

  


  -i GoopDeer.mp4 -ss 00:03:23 -to 00:03:33 -filter_complex "[0:v]scale=iw*2:-1,crop=1920:1088:1920:1088[Vídeo];
drawtext=text='IT'S NATHAN!!!': fontsize=100: fontcolor=white[texto];[Vídeo][texto]overlay" 10.mp4


  


  but is not correct, it's not rendering.
This is the error i got -

  


  


  bash : !' : event not found

  


  


  How do i do this ?

  


• How to trigger from button in UVC camera

  8 août 2016, par Buddhishan Manamperi

  I’m taking pictures from a webcam using Intel Edison. I was able to capture still images from the camera after installing uvc driver for linux and ffmpeg software. I use a script to capture.

  ./ffmpeg -s 640x640 -f video4linux2 -i /dev/video0 -vframes 1 image.jpeg;

  I want to capture the image from the button (in the web cam) press event. I used a USB analyzer in windows to analyze packets. It was found that URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER is transferring UP and DOWN when the button is pressed.

  Please Help me to implement button press triggering on Linux so that I could use it on Edison.