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• Injecting KLV data in video stream using ffmpeg

  29 octobre 2022, par lsilk

  Does anyone here have any experience with streaming video on one stream, for example 0:0, and then taking a .bin file in klv format and putting it in 0:1, and then outputting that to a mpegts udp stream ? I have it working, the only problem is that I have written a python program to update the klv data file while it is streaming, but it doesn't seem to be updated in the stream.

  


  My command : ffmpeg -I "filepath.mpg" -f data -i "filepath.bin" -filter:v fps=60 -map 0:v:0 -map 1:d:0 -f mpegts udp ://IP:PORT

  


  Ive tried -I from a local file, I've also tried streaming the .bin file from an other stream after updating it, but then the fps drops to about 0.5.

  


• How OpenGL directly manipulates data on GPU that a video hardware decoded by FFmpeg CUDA

  24 janvier 2019, par gn cavalry

  Ubuntu 18.04
  FFmpeg 4.1
  CUDA 10.0

  What I want to do is using FFmpeg CUDA decode a video, directly peocess data on GPU by GLSL , then encode data using FFmpeg CUDA. Like this :

  Raw Video —> FFmpeg CUDA decoder —> GLSL —> FFmpeg CUDA encoder —> New Video

  Here is the short code :

  ret = avcodec_send_packet(decoder_ctx, pkt);
  
  while (ret >= 0) {
  
      ret = avcodec_receive_frame(decoder_ctx, frame);
  
  
  
      /**
  
       * Now CUDA decoded data is stored on GPU and referenced by frame
  
       * How can GLSL manipulate decoded data on GPU directly, 
  
       * without transfer it to CPU and load to GPU again by glTexImage2D()
  
       */
  
  
  
  
  
      // I don't if the following code is right, if GLSL processed data is still referenced by frame
  
      while (avcodec_send_frame(encoder_ctx, frame)) {
  
          avcodec_receive_packet(encoder_ctx, &enc_pkt);
  
      }
  
  }

  Can anyone help me ? Thanks very much !

• Sample RTP code to stream x264 data

  5 août 2016, par Ajay Ponna Venkatesh

  I am using x264 library to encode frames and I need to stream it to a client which will receive the frame, decode and render it.
  Currently, I have borrowed the code from OBS to stream through RTMP and have written a client using FFMPEG’s RTMP code to receive this data. BUT RTMP works on TCP and I now need to stream over UDP. OBS doesn’t seem to support any other protocols than RTMP.

  So, I decided to use RTP. I can write a client to receive and decode using FFMPEG since it supports RTP just like RTMP. Can anyone please help me with sample code to stream x264 encoded data through plain RTP ? (I don’t want to complicate by using RTSP etc. along with RTP).

  The requirement is simple. Say, I use ffplay -> ffplay.exe rtp ://127.0.0.1:17000 then I want this sample code to be able to send data through RTP (over UDP) and ffplay should be able to play. I can take it over from there. Thanks in advance !

  -Ajay