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• Mingw-w64 - printf does not work

  27 décembre 2013, par Gosha U.

  First I wanted to modificate ffplay according to my requirments. Then I noticed that original ffplay from my build can't play some video files, but it didn't write any message to console. Then I noticed that ffmpeg also don't write any usage message when I run it without params. But it works. If I run it from terminal it's like running asynchronously ! The terminal just shows next row. I mean it asks for a next command. But the ffmpeg process is visible in task manager and it writes the output video file what I had requested !

  I created following souce file. I have modified the Makefile. So it have built the exe-file works just the same way. I have no idea how it can be.

  #include 
  
  #include "cmdutils.h"
  
  
  
  const char program_name[] = "hello";
  
  const int program_birth_year = 2013;
  
  
  
  void show_help_default(const char *opt, const char *arg)
  
  {
  
      printf("zxcvbnm\n");
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
      printf("1234567890\n");
  
      return 0;
  
  }

  And after that I created real hello world app with MinGW-w64 and qmake without eny extra libs. And its printf does not work.

  I want to prevent this behavior.

  I want to make printf working in traditional manner.

  How I build FFmpeg :

  PKG_CONFIG_PATH=/home/developer/workspace/MinGW32fs/lib/pkgconfig/ \
  
  SDL_CONFIG=/home/developer/workspace/MinGW32fs/bin/sdl-config \
  
  ./configure \
  
    --prefix=/home/developer/workspace/MinGW32fs \
  
    --extra-ldflags="-L/home/developer/workspace/MinGW32fs/lib" \
  
    --extra-cflags="-I/home/developer/workspace/MinGW32fs/include" \
  
    --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32-  \
  
    --pkg-config=pkg-config   --enable-libtheora --enable-libvorbis --enable-libvpx \
  
    --enable-outdev=sdl --enable-shared --disable-static \
  
    --disable-doc --disable-manpages --disable-podpages
  
  
  
  make

• How to convert .flv video into .h264 format by using ffmpeg in linux ?

  17 octobre 2012, par Shishir Mudliyar

  Aim : video conversion from .flv to .h264 format.

  Problem : I have done conversion from flv to h264 format but my converted video (.h264) is running so fast(just like we click on fast forward button). Following Linux terminal command i used for creating .h264 video from flv by using ffmpeg.

  ffmpeg -i example.flv -sameq -vcodec libx264 -vpre default -ar 22050 output.h264

  I have gone through google but not see any appropriate help .

• How can I extract multiple video files from one wmv file using ffmpeg ? [closed]

  31 octobre 2023, par Adriana

  I have a single wmv file that has 4 video tracks on it. I'm not sure why but the program I was using to record these videos saved them all onto one file. How can I extract and save all 4 videos into seperate files using ffmpeg ?

  


  So far I have tried running the following in terminal, but I get an error saying "event not found : Filename !

  


  ffmpeg -i “!FileName!” -map 0:v -c copy “!NewFileName!.mp4” 


  


  Also the way I have it written would only extract the first video I think. How do I extract all 4 ?