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• How to Remove a Specific Segment from an Audio File Using Timestamps in C# ? [closed]

  8 février, par Hilal Khan

  I am working on a C# project where I need to remove a specific segment from an audio file (e.g., WAV, MP3) based on start and end timestamps, while keeping the rest of the audio intact.

  


  For example, given a 20-minute audio file, I want to remove the section from 17:00 to 19:00 and be left with a new audio file containing only 0:00-17:00 and 19:00-20:00 (i.e., keeping the parts before and after the cut).

  


  I have used NAudio and FFmpeg to trim a file by cutting from the start or end, but I only get my desired snippet as a separate file which is not what I am looking for as I want it to be removed from the audio itself

  


  Heres what I have so far :

  


  static void RemoveSegment(string inputPath, string outputPath, double startTime, double endTime)
{
    using (var reader = new Mp3FileReader(inputPath))
    {
        var writer = new FileStream(outputPath, FileMode.Create, FileAccess.Write);

        int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;
        long startPosition = (long)(startTime * 1000) * bytesPerMillisecond;
        long endPosition = (long)(endTime * 1000) * bytesPerMillisecond;

        byte[] buffer = new byte[4096];
        int bytesRead;

        while ((bytesRead = reader.Read(buffer, 0, buffer.Length)) > 0)
        {
            if (reader.Position < startPosition || reader.Position > endPosition)
            {
                writer.Write(buffer, 0, bytesRead);
            }
        }

        writer.Close();
    }

    Console.WriteLine("Segment removed successfully!");
}


  


• How to remove a specific segment from an audio file using timestamps ? [closed]

  9 février, par Hilal Khan

  I am working on a C# project where I need to remove a specific segment from an audio file (e.g., WAV, MP3) based on start and end timestamps, while keeping the rest of the audio intact.

  


  For example, given a 20-minute audio file, I want to remove the section from 17:00 to 19:00 and be left with a new audio file containing only 0:00-17:00 and 19:00-20:00 (i.e., keeping the parts before and after the cut).

  


  I have used NAudio and FFmpeg to trim a file by cutting from the start or end, but I only get my desired snippet as a separate file which is not what I am looking for as I want it to be removed from the audio itself

  


  Heres what I have so far :

  


  static void RemoveSegment(string inputPath, string outputPath, double startTime, double endTime)
{
    using (var reader = new Mp3FileReader(inputPath))
    {
        var writer = new FileStream(outputPath, FileMode.Create, FileAccess.Write);

        int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;
        long startPosition = (long)(startTime * 1000) * bytesPerMillisecond;
        long endPosition = (long)(endTime * 1000) * bytesPerMillisecond;

        byte[] buffer = new byte[4096];
        int bytesRead;

        while ((bytesRead = reader.Read(buffer, 0, buffer.Length)) > 0)
        {
            if (reader.Position < startPosition || reader.Position > endPosition)
            {
                writer.Write(buffer, 0, bytesRead);
            }
        }

        writer.Close();
    }

    Console.WriteLine("Segment removed successfully!");
}


  


• Browser MediaRecorder API - video controls not working / headers set incorrectly ?

  7 avril 2017, par leo

  I’m trying to record a webcam video in the browser and save the stream on a node server.

  Approach with MediaRecorder API

  // CLIENT
  
  // Init MediaRecorder with camera stream 
  
  recorder = new MediaRecorder(...)
  
  // Serialize data and send it to backend
  
  recorder.ondataavailable = (event) => {
  
     const reader = new FileReader();
  
     reader.readAsArrayBuffer(event.data);
  
     reader.onloadend = function (event) {
  
       socket.emit('message', reader.result);
  
     };
  
  }
  
  
  
  // BACKEND
  
  // Receive data and append it to the file
  
  client.on('message', (data) => { 
  
    fs.appendFileSync(filePath + fileName + videoFileExtension, data);
  
    ... 
  
  }

  Problem

  The first time the video is played in the browser the controls for forward and backwards are not working. Once it has been played, controls are ok.

  Assumption

  My assumption is that the headers are somehow broken.

  Question

  Any ideas how to repair the video captured by MediaRecorder and streamed to the NodeJS ? Or how to save the data chunks properly in a video file so that controls work ?