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• Read/convert H.265 in react with ffmpeg

  19 avril 2022, par CTKC

  I'd like to be able to read videos of any codec in my react app, including h.265, which is the problem child.
I know of two possible ways to do this : the first being to convert the files upon upload to h.264,
and the second using a library to stream the videos with ffmpeg, I found an interesting documentation explaining this scenario WASM H.265 player

  


  Does anyone have experience in using this library or actually live streaming h.265 (which isn't supported in chromium browsers) and if so, what are your thoughts on it ?

  


  Any answer is always appreciated !

  


• avutil/file_open : avoid file handle inheritance on Windows

  29 octobre 2015, par Tobias Rapp

  avutil/file_open : avoid file handle inheritance on Windows
  Avoids inheritance of file handles on Windows systems similar to the
  
  O_CLOEXEC/FD_CLOEXEC flag on Linux.
  Fixes file lock issues in Windows applications when a child process
  
  is started with handle inheritance enabled (standard input/output
  
  redirection) while a FFmpeg transcoding is running in the parent
  
  process.
  Links relevant to the subject :
  https://msdn.microsoft.com/en-us/library/w7sa2b22.aspx
  Describes the _wsopen() function and the O_NOINHERIT flag. File handles
  
  opened by _wsopen() are inheritable by default.
  https://msdn.microsoft.com/en-us/library/windows/desktop/ms682425%28v=vs.85%29.aspx
  Describes handle inheritance when creating new processes. Handle
  
  inheritance must be enabled (bInheritHandles = TRUE) e.g. when you want
  
  to pass handles for stdin/stdout via lpStartupInfo.
  Signed-off-by : Tobias Rapp <t.rapp@noa-audio.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/file_open.c

• avformat_open_input failed to open unnamed pipe

  8 octobre 2015, par user2406774

  hi i am writing an application that reads data from network and feeds it to unnamed pipe and i want to read it from other end of pipe using avformat_open_input but this call blocking infinetly any idea about how to read stream from unnamed pipe

  here is the flow of code

   int fd[2]
  
      pipe(fd);
  
      if(fork()==0){
  
      //child process
  
      close(fd[1]);
  
      avcodec_register_all();
  
      av_register_all();
  
      avformat_network_init();
  
  
  
      AVInputFormat *input_format = av_find_input_format("mp4");
  
      if (!input_format)
  
      {
  
      fprintf(stderr, "Could not find MP4 demuxer.\n");
  
      exit(1);
  
      }
  
  
  
      AVFormatContext *input_context = NULL;
  
      fprintf(stderr,"Before opening input context\n");
  
      int ret = avformat_open_input(&input_context, fd[0],input_format, NULL);
  
     // int ret = avformat_open_input(&input_context, "pipe:fd[0]",input_format, NULL);
  
      fprintf(stderr,"After opening input context\n");
  
  
  
      }
  
  
  
  
  
      else{
  
          //parent process
  
          close(fd[0]);
  
          read data from Network();
  
          //write it to pipe
  
          ret=write(fd[1], udp_packet, len);
  
  
  
          }

  after opening input stream i am trying to transcode the mp4 to mpeg ts file .if i give mp4 file as filename filed in avformat_open_input API it is working fine

  any suggestions ?