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• Execute command by php exec() with xampp in ubuntu {not working}

  27 juin 2020, par Mohamed Ali

  I executed this command
nohup ffmpeg -i input.mp4 -vcodec h264 -preset:v ultrafast -b:v 1000k -acodec mp3 output.mp4 2>output.txt &
in ubuntu by Terminal and it worked properly but when I tried to execute it by php exec($myCommand) it didn't work and show this message

  


  Error message :


  


  I tried to solve it by change name of this file libstdc++.so.6 to libstdc++.so.6.old in this directory /opt/lampp/lib after that when I execute my command it show this message
ffmpeg: symbol lookup error: /lib/x86_64-linux-gnu/libcairo.so.2: undefined symbol: FT_Get_Var_Design_Coordinates

  


• FFmpeg AVFoundation audio format is not supported by using Qt on macOS

  23 juillet 2019, par Jim

  There’s an error when Using FFmpeg and Qt to build an application to record microphone on macOS.
  Just call the avformat_open_input() only for testing open device.

  It worked at fist run, but failed after that.

  int main(int argc, char *argv[])
  
  {
  
      QApplication a(argc, argv);
  
  
  
      MainWindow w;
  
      w.show();
  
  
  
      avdevice_register_all();
  
      AVInputFormat* iFormat = av_find_input_format("avfoundation");
  
      inputFmtCtx = avformat_alloc_context();
  
      int ret = avformat_open_input(&inputFmtCtx, ":0", iFormat, nullptr);
  
      if(ret < 0) {
  
         char errBuf[1000];
  
         qDebug() << av_make_error_string(errBuf, sizeof(errBuf), ret);
  
         return;
  
      }
  
     avformat_close_input(&inputFmtCtx);
  
     return a.exec();
  
  }

  The error message :

  [avfoundation @ 0x7f955f8a0a00] audio format is not supported

  It’s success every time when put the code before window show.

  int main(int argc, char *argv[])
  
  {
  
      QApplication a(argc, argv);
  
  
  
      avdevice_register_all();
  
      AVInputFormat* iFormat = av_find_input_format("avfoundation");
  
      inputFmtCtx = avformat_alloc_context();
  
      int ret = avformat_open_input(&inputFmtCtx, ":0", iFormat, nullptr);
  
      if(ret < 0) {
  
          char errBuf[1000];
  
          qDebug() << av_make_error_string(errBuf, sizeof(errBuf), ret);
  
          return;
  
      }
  
  
  
  
  
     MainWindow w;
  
     w.show();
  
     return a.exec();
  
  }

• Skipping MP4 video

  4 avril 2017, par M.Yazdian

  I like to create the video player to show videos on my website. I made a video player in flash CS5 and actionscript3 to stream the videos on the website.

  My videos are often flv or mp4 format.
  In the flv files I use flvmdi app to inject the metadata to that ,and for skipping the flv file I use xmoov-php (video player can pass the keyframe number from flv metadat to xmoov-php to create the new flv file from passed keyframe to the last flv keyframe, and return the flv video file on the php header for flash video player to show the video ).

  but about mp4 format in Xmoov-php wiki it says :
  this file can’t support the mp4 format to skiping...!!!
  Now I need skiping the mp4 files in my video player (I like my viewers select a part of video before buffering all video on their browser and play it ).

  please give me a suggestion to skipping the mp4 file in the php or .net platform