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• Running ffmpeg with multiple pipes

  13 août 2017, par baci

  Is there a way to let ffmpeg read from multiple buffers or multiple named pipes ?

  Basically I want to output the first loop to different pipes instead of .jpg files, and run the video filter command using those pipes as input. Right now enormous disk IO is needed to create and read jpg tiles.

  // heic -> tiles -> jpeg tiles
  
  #pragma omp parallel for
  
      for(uint i = 0; i < data.tiles.size(); ++i) {
  
          char buff[100];
  
          snprintf(buff, sizeof(buff), "./tmp/%03d.jpg", data.tiles[i].idx);
  
          std::string cmdStr = "ffmpeg -i - -loglevel warning -frames:v 1 -vsync vfr -an -q:v 1 " + std::string(buff);
  
          FILE * pipe_in;
  
          if(pipe_in = popen(cmdStr.c_str(), "w")) {
  
              fwrite((char*)&data.tiles[i].data[0], 1, data.tiles[i].data.size(), pipe_in);
  
              fflush(pipe_in);
  
              fclose(pipe_in);
  
          }
  
      }
  
  
  
  ... some processing
  
  
  
  // jpeg tiles -> big jpeg
  
  std::string inputStr = "./tmp/%03d.jpg";
  
  std::string cmdStr = "ffmpeg -i " + inputStr +
  
          " -loglevel warning -threads 4 -q:v 1 -vf \"tile=" + std::to_string(data.cols) + "x" + std::to_string(data.rows) +
  
          ",crop=" + std::to_string(data.width) + ":" + std::to_string(data.height) + ":0:0" +
  
          transStr + "\" -y " + outputStr;
  
  ret = std::system(cmdStr.c_str());

• how to make ffmpeg process large files faster ?

  12 octobre 2019, par Hakim Douib

  I am using ffmpeg to view video for dash player. But the videos used are more than 1GB, and the server has
  60 GB of RAM
  Ten cores

  The server takes more than 50 hours to process a video.
  The method I use is by separating each operation thread to make it faster ,
  and the files in the end have size between 2 to 5 GB

  dash params variable

  VP9_DASH_PARAMS="-tile-columns 4 -frame-parallel 1"

  cmd :

  ffmpeg  -i  vid_origenal.mp4 -c:v libx265  -s 1920x1080 -b:v 3000k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1  1080.webm >/dev/null 2>&1 &

  I use this for all qualities

  thanks

• FFMPEG - Image Overlay Fade Memory Leak

  14 septembre 2017, par DMtd

  Hoping someone can help explain where I may be going wrong with this command. I’m testing an image overlay, including fade in and fade out, with video. The overlay works fine without the fades, but once they are added ffmpeg reaches the end of the process but does not complete. The file stops growing and the process in windows continues to grow, leaking memory. The resulting file is correct (if I force the process to end), I just can’t understand why the process doesn’t complete on its own. Is anyone aware of this memory leak issue with overlay fades and a way to resolve it ?

  ffmpeg -t 00:01:00.000 -i "Input.mxf" -loop 1 -i "Image.png" -vcodec mpeg2video -s 1920x1080 -b:v 50000k -maxrate 50000k -bufsize 3835k -minrate 50000k -r 25 -flags ilme -top 1 -profile:v 0 -level:v 2 -ar 48000 -pix_fmt yuv422p -filter_complex "[1:v]fade=t=in:st=0:d=0.6,fade=t=out:st=59.36:d=0.6[over] ;[0:v][over]overlay=shortest=1 "Output.mxf"

  UPDATE : I found another thread which gave the answer, although I had to reverse the order of my inputs and the mapping for it to work. Simply adding shortest=1 didn’t work. So this is what worked :

  ffmpeg -t 00:01:00.000 -loop 1 -i "Image.png" -i "Input.mxf" -vcodec mpeg2video -s 1920x1080 -b:v 50000k -maxrate 50000k -bufsize 3835k -minrate 50000k -r 25 -flags ilme -top 1 -profile:v 0 -level:v 2 -ar 48000 -pix_fmt yuv422p -filter_complex "[0:v]fade=t=in:st=0:d=0.6,fade=t=out:st=59.36:d=0.6[over] ;[1:v][over]overlay=shortest=1 "Output.mxf"