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• Draw time of the current frame in seconds with just 2 digits after point

  13 janvier 2023, par 124bit

  I can’t find the way to draw time of the current frame in seconds with just 2 digits after point.
I tried “drawtext”, and it does well, however it gives or int seconds, or float with many digits =(

  


• C# How do I set the volume of sound bytes[]

  23 juillet 2016, par McLucario

  Im trying to change the volume of sound bytes[] in C#. Im reading a sound file with FFMPEG and and wanna change the volume on the fly. I found some examples and but I didnt understand them.

  public void SendAudio(string pathOrUrl)
  
  {
  
      cancelVid = false;
  
      isPlaying = true;
  
  
  
      mProcess = Process.Start(new ProcessStartInfo
  
      { // FFmpeg requireqs us to spawn a process and hook into its stdout, so we will create a Process
  
          FileName = "ffmpeg",
  
          Arguments = "-i " + (char)34 + pathOrUrl + (char)34 + // Here we provide a list of arguments to feed into FFmpeg. -i means the location of the file/URL it will read from
  
          " -f s16le -ar 48000 -ac 2 pipe:1", // Next, we tell it to output 16-bit 48000Hz PCM, over 2 channels, to stdout.
  
          UseShellExecute = false,
  
          RedirectStandardOutput = true, // Capture the stdout of the process
  
          Verb = "runas"
  
      });
  
  
  
      while (!isRunning(mProcess)) { Task.Delay(1000); }
  
  
  
      int blockSize = 3840; // The size of bytes to read per frame; 1920 for mono
  
      byte[] buffer = new byte[blockSize];
  
      byte[] gainBuffer = new byte[blockSize];
  
      int byteCount; 
  
  
  
      while (true && !cancelVid) // Loop forever, so data will always be read
  
      {
  
          byteCount = mProcess.StandardOutput.BaseStream // Access the underlying MemoryStream from the stdout of FFmpeg
  
          .Read(buffer, 0, blockSize); // Read stdout into the buffer
  
  
  
          if (byteCount == 0) // FFmpeg did not output anything
  
              break; // Break out of the while(true) loop, since there was nothing to read.
  
  
  
          if (cancelVid)
  
              break;
  
  
  
          disAudioClient.Send(buffer, 0, byteCount); // Send our data to Discord
  
      }
  
      disAudioClient.Wait(); // Wait for the Voice Client to finish sending data, as ffMPEG may have already finished buffering out a song, and it is unsafe to return now.
  
      isPlaying = false;
  
      Console.Clear();
  
      Console.WriteLine("Done Playing!");

• How to figure out which audio file has more volume level using ffmpeg ?

  1er avril 2021, par Mayank Thapliyal

  I am facing an issue and I don't even know how to describe it technically so I am explaining my issue in plain English (Sorry if someone gets offended)

  


  I have many audio files which I play them in the background in a video. But unfortunately the audio files have different level of volume level :- some audio files have low volume level whereas some audio files have very high level of volume.

  


  Is there any way to reduce the volume level in those audio files where volume level is high (leaving low volume audio files as it is) using ffmpeg. Or something like this

  


  Thank You