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• Second instance of ffmpeg for experimenting

  18 septembre 2014, par Brian Bennett

  I’m experimenting with databending/glitching images and videos as part of a master’s class. I’ve used Audacity to do most of it thus far, but it isn’t as successful with video.

  I want to try to edit video by changing the source codecs in ffmpeg, but I don’t want to inadvertently destroy my current install.

  Is it possible to install a second instance of ffmpeg to run independently for experimentation purposes ?

  If so, what Terminal command would I use to create a second, executable directory ?

• How to stack videos horizontally with their audios combined in ffmpeg in nodejs ?

  5 novembre 2018, par Abhilash

  I have a video calling app which I have implemented using Kurento Media Server. With the Recorder Endpoints from kurento I am able to record the videos of caller and callee separately. After the call I want to combine the videos into a single video. I want to stack the videos horizontally and combine their audios. I have done this using ffmpeg from terminal using complex filters but I want to achieve the same thing using ffmpeg nodejs library. Please help me. Thanks in advance.

• 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