Got a frame at sample rate 44100, in an MP3 with sample rate 48000. Mp3FileReader does not support sample rate changes

Question

I'm using NAudio in my with my Wpf app first time.

Steps: 1) Recording to MemoryStream using NAudio (C#, Wpf). This is my recording code:

 public void StartRecording()
    {
        this.waveSource = new WaveIn();

        if (Stream == null)
        {
            Stream = new MemoryStream();
        }
        waveSource.WaveFormat = new WaveFormat(44100, 2);
        this.waveFile = new WaveFileWriter(this.Stream, this.waveSource.WaveFormat);
        this.waveSource.DataAvailable += new EventHandler<WaveInEventArgs>(waveSource_DataAvailable);
        this.waveSource.RecordingStopped += new EventHandler<StoppedEventArgs>(waveSource_RecordingStopped);
        this.waveSource.StartRecording();

    }

        private void waveSource_DataAvailable(object sender, WaveInEventArgs e)
    {
        if (waveFile != null)
        {
            waveFile.Write(e.Buffer, 0, e.BytesRecorded);
            int secondsRecorded = (int)(waveFile.Length / waveFile.WaveFormat.AverageBytesPerSecond);

            waveFile.Flush();
        }
    }

    private void waveSource_RecordingStopped(object sender, StoppedEventArgs e)
    {
        if (waveSource != null)
        {
            waveSource.Dispose();
            waveSource = null;
        }

        if (waveFile != null)
        {
            waveFile.Dispose();
            waveFile = null;
        }
    }

2) After stopping it I am inserting array of recorded stream (MemoryStream.ToArray()) to Database (SQLite).

3) Getting from database and converting it to stream to play it:

Stream stream = new MemoryStream(bytes); 
var mp3Reader = new Mp3FileReader(stream);

Mp3FileReader is throwing an exception: Got a frame at sample rate 44100, in an MP3 with sample rate 48000. Mp3FileReader does not support sample rate changes.

Could someone tell me where I am doing wrong, please. I found some questions but they didn't help me. Sorry If there any duplicate question. Thanks

Drupelet

This may be helpful: Look at this link: codeproject.com/Tips/56882/MP-Sound-Recording-Tool – Abbottson

Answer 1

You have saved a WAV file, not an MP3 file, so you need to use WaveFileReader instead of Mp3FileReader in order to play it back.

Patronize

Is there any way to convert Wav file to Mp3? So I should use Mp3FileReader because in my database all files are Mp3 files. Thanks – Drupelet

Or is it possible to record mp3 file? – Drupelet

I tend to use LAME.exe to convert WAV to MP3. If you are on Win 8 you can do it with MediaFoundationEncoder instead – Patronize

Answer 2

I also got this exception message just like you. I solved like this:

MediaFoundationReader readers = new MediaFoundationReader(filepath);

instead of

Mp3FileReader readers = new Mp3FileReader(filepath);

When I use the MediaFoundationReader, I didn't get that exception message.

Machination

FYI, if you are working with a MemoryStream and not a file, you can also use the stream version of the class: new StreamMediaFoundationReader(memoryStream) – Antwanantwerp