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• How to add blurred border on top and bottom based on the video

  5 avril 2023, par Noob69

  I am trying to modify a video to 1080x1920 scale and I want to add to the borders on top and bottom, a blurred version of the video based on the pixel on the edge.

  


  import subprocess

input_file = "my_video1.mp4"
output_file = "my_video_processed1.mp4"

command = f'ffmpeg -i {input_file} -vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2,eq=saturation=2.0:gamma=1.2:contrast=1.2,unsharp=lx=5:ly=5:la=0.5:cx=5:cy=5:ca=0.5" -c:v libx264 -preset slow -crf 18 -c:a copy {output_file}'
subprocess.call(command, shell=True)



  


  I tried
mode = replicate, however it is not working for the latest version of ffmpeg from Windows builds by BtbN.

  


• How to embed pic_timing SEI wallclock timecodes in RTMP streaming ?

  13 novembre 2023, par MorenoGentili

  I need to stream my desktop to the AWS MediaLive service and, as a requirement, I must include wallclock timecodes in the stream. The AWS support kindly informed me that for h.264 encoded streams, I need to provide timecodes as "pic_timing SEI messages".

  



  I'm streaming with FFmpeg via the RTMP protocol on Windows 10 so, I tried adding the use_wallclock_as_timestamps and copyts flags to my command.

  



  ffmpeg -f gdigrab -framerate 30 -offset_x 0 -offset_y 0 -video_size 1920x1080 -show_region 1 -use_wallclock_as_timestamps 1 -i desktop -vf scale=320:240 -c:v libx264 -c:a aac -profile:v main -level 3.1 -pix_fmt yuv420p -copyts -f flv rtmp://<ip>:1935/<app>/<stream>&#xA;</stream></app></ip>

  



  However, the timecodes are not picked up by AWS MediaLive.

  



  My questions are :

  



  

  • Does the use_wallclock_as_timestamps flag actually create timecodes as "pic_timing SEI messages" as required ?

  


  • If not, how do I add wallclock timecodes as "pic_timing SEI messages" ? It doesn't have to be every frame. Every 2 or 3 seconds would suffice.

  


  



  I'm stumped. I couldn't find the answer in the FFmpeg documentation.

  



  Thanks for your help.

  


• How send opencv video's to ffmpeg

  20 mai 2016, par Jahan Balasubramaniam

  I m trying to send the processed opencv Mat as video to ffmpeg. I m encoding the frame and writing it to std output and then piping it to ffmpeg. Here is my code.

  C++ :

  if(!cap.isOpened()) {
  
      cout << "Video not accessible" << endl;
  
      return -1;
  
  } else {
  
      cout << "Video is accessible" << endl;
  
  }
  
  
  
  while (true) {
  
  
  
      cap >> frame;
  
  
  
      //some processing
  
  
  
      cv::imencode(".jpg", frame, buff);
  
      for (i = buff.begin(); i != buff.end(); ++i)
  
          std::cout << *i ;
  
  }

  My input video resolution is 640x418. I do not alter the video size

  After building, I use following command to execute.

  ./a.out | fmpeg -f rawvideo -pix_fmt bgr24 -s 640x418 -r 30 -i - -an -f mpegts udp://0.0.0.0:8182

  and also this

  ./a.out | fmpeg -i pipe:0 -f rawvideo -pix_fmt bgr24 -s 640x418 -r 30 -i - -an -f mpegts udp://0.0.0.0:8182

  However none of this seems to work.

  Kindly help.