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• Algorithm to draw waveform from audio

  25 septembre 2024, par yayuj

  I'm trying to draw a waveform from a raw audio file. I demuxed/decoded an audio file using FFmpeg and I have those informations : samples buffer, the size of the samples buffer, the duration of the audio file (in seconds), sample rate (44100, 48000, etc), sample size, sample format (uint8, int16, int32, float, double), and the raw audio data itself.

  



  Digging on the Internet I found this algorithm (more here) :

  



  White Noise :

  



  

  



  The Algorithm

  



  


  All you need to do is randomize every sample from –amplitude to
 amplitude. We don’t care about the number of channels in most cases so
 we just fill every sample with a new random number.

  


  



  Random rnd = new Random();
short randomValue = 0;

for (int i = 0; i < numSamples; i++)
{
    randomValue = Convert.ToInt16(rnd.Next(-amplitude, amplitude));
    data.shortArray[i] = randomValue;
}


  



  It's really good but I don't want to draw that way, but this way :

  



  

  



  Is there any algorithm or idea of how I can be drawing using the informations that I have ?

  


• How to build Soltion and Run Without ffmpeg shared DLL(Static Build Solution)

  11 avril 2018, par P Akhtar

  I want to build a solution in visual studio 2009 and run exe without FFMPEG Shared DLL. Simply I want to build my solution static

  Similar Question
  visit : How to use ffmpeg so that there would be no need in including its dlls in your app folder ?

  I built ffmpeg static lib and than I got

  libavdevice.a
  
  libavcodec.a
  
  libavfilter.a
  
  libavformat.a
  
  libavutil.a
  
  libpostproc.a
  
  libswresample.a
  
  libswscale.a

  But Issue is how I Can use it there is linking error-> like error LNK2001 : unresolved external symbol __ltod3 and and other more

• Convert Process Output to Progressbar C# [on hold]

  28 mars 2018, par adrifcastr

  So I am using FFMPEG to convert a audio file, and I need to get a progressbar to show the current conversion process. So as reading through Stackoverflow I found this, which uses a Streamreader to get the complete duration of the file and the current progress into a string. This didn’t work for me, I assumed it’s because I am using WPF. So can someone help me to get those values and then use them to calculate the percentage and show it with a Progressbar ?

  Below are samples of what’s displayed in FFMPEG’s output stream.

  //Complete Duration of the Audio file being converted
  
    Duration: 06:41:03.68, start: 0.000000, bitrate: 64 kb/s
  
  
  
  
  
  //Current conversion progress
  
  size=    1197kB time=00:02:02.14 bitrate=  80.3kbits/s speed=42.9x