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• Cannot find installation of real FFmpeg (which comes with ffprobe)

  29 mars 2023, par Asm Goni

  I was trying to fit a generator into a model and I got this error : 
AssertionError: Cannot find installation of real FFmpeg (which comes with ffprobe).

  



  I have looked over many of the solutions on GitHub and other questions on Stack Overflow but none of them worked for me.

  



  Here is one of the commands I ran :

  



  sudo add-apt-repository ppa:mc3man/trusty-media  
sudo apt-get update  
sudo apt-get install ffmpeg  
sudo apt-get install frei0r-plugins  


  



  pip list also indicates the presence of ffmpeg-1.4

  



  In addition, I tried force reinstalling and updating ffmpeg just in case any dependencies were not installed properly.

  



  I also set the skvideo's path for ffmpeg manually :

  



  skvideo.setFFmpegPath('/usr/local/lib/python3.6/dist-packages/ffmpeg/')


  



  This returns : /usr/local/lib/python3.6/dist-packages/skvideo/__init__.py:306: UserWarning: ffmpeg/ffprobe not found in path: /usr/local/lib/python3.6/dist-packages/ffmpeg/
  warnings.warn("ffmpeg/ffprobe not found in path: " + str(path), UserWarning)

  



  By the way, when I try installing, it also returns this error, I don't know what to do about this :

  



  Get:127 http://archive.ubuntu.com/ubuntu bionic/main amd64 vdpau-driver-all amd64 1.1.1-3ubuntu1 [4,674 B]
Fetched 60.4 MB in 7s (8,769 kB/s)
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/w/wavpack/libwavpack1_5.1.0-2ubuntu1.1_amd64.deb  404  Not Found [IP: 91.189.88.149 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?


  



  I ran apt-get update --fix-missing and that didn't make anything better.

  



  Is there a solution to this ?

  


• Raw output file got damaged

  9 septembre 2021, par Alenew

  I’m working on oneVPL samples from this GitHub repository (https://github.com/oneapi-src/oneAPI-samples ) and I’m trying to build hello-vpp sample. After running the program with the command in readme.md file, I wanted to increase the video size to 1280x720. While playing the raw output file, I used the below command

  


  fplay -video_size 1280x720 -pixel_format bgra -f rawvideo out.raw


  


  My raw output file got damaged. A buffered video got played. How do I change the width and height of the output file ? Any suggestions here ?

  


• ffmpeg audio decode data is zero

  19 décembre 2012, par Albert Zhang

  I tried to decode the audio using ffmpeg with the following code :

  NSMutableData *finalData = [NSMutableData data];
  
  ......
  
  while(av_read_frame(pFormatCtx, &packet) >= 0){
  
      if(packet.stream_index == videoStream)
  
      {
  
          int consumed = avcodec_decode_audio4(pCodecCtx, pFrame, &got_frame_ptr, &packet);
  
  
  
          if(got_frame_ptr)
  
          {
  
              [finalData appendBytes:(pFrame->data)[0] length:(pFrame->linesize)[0]];
  
  
  
          }
  
      }
  
      av_free_packet(&packet);
  
  }
  
  ......
  
  [finalData writeToFile:path atomically:YES];

  Bu the saved file can't be played, even I changed the file extension to wav. When I look into it in HexEdit (a Hex editor), I found there are many zero bytes. For example the content of the file before offset 0x970 are all zero. Is there any error in my code ? Any help will be appreciated.