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• ffmpeg : how to save h264 raw data as mp4 file

  15 avril 2016, par monkid

  I encode h264 data by libavcodec.
  ex.

  while (1) {
  
    ...
  
    avcodec_encode_video(pEnc->pCtx, OutBuf, ENC_OUTSIZE, pEnc->pYUVFrame);
  
    ...
  
  }

  If I directly save OutBuf data as a .264 file, it can`t be play by player. Now I want to save OutBuf

  as a mp4 file. Anyone know how to do this by ffmpeg lib ? thanks.

• 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 !