C#•5w ago

Poor audio quality with LibVLCSharp

Hello, I am a newbie in C# and WinForm and i'm developing a Windows Form application in C#, .NET Framework 4.8, with the LibVLCSharp.Winforms library (the latest version downloaded from NuGet). It works like that : you import a file (video file, for exemple), you select it, you press a button, it open a new window on the 2nd screen, it get in fullscreen and it launch the video. I am facing a persistent audio quality issue : the sound in my application seems really weird (compressed, or poor quality). However when i play the exact same video file with the official VLC software, the audio quality is perfect. I have tried a lot of things, such as forcing the audio ouput module. The code that initialize the player

 public VideoPlayerForm(Screen screen, string videoPath)
    {
        this.Shown += VideoPlayerForm_Shown;
    }

    private void VideoPlayerForm_Shown(object sender, EventArgs e)
    {
        Core.Initialize();
        _libVLC = new LibVLC(); 
        _mediaPlayer = new MediaPlayer(_libVLC);
        
        _videoView = new VideoView { MediaPlayer = _mediaPlayer, Dock = DockStyle.Fill };
        this.Controls.Add(_videoView);

        using (var media = new Media(_libVLC, new Uri(videoPath)))
        {
            _mediaPlayer.Play(media);
        }
    }

 public VideoPlayerForm(Screen screen, string videoPath)
    {
        this.Shown += VideoPlayerForm_Shown;
    }

    private void VideoPlayerForm_Shown(object sender, EventArgs e)
    {
        Core.Initialize();
        _libVLC = new LibVLC(); 
        _mediaPlayer = new MediaPlayer(_libVLC);
        
        _videoView = new VideoView { MediaPlayer = _mediaPlayer, Dock = DockStyle.Fill };
        this.Controls.Add(_videoView);

        using (var media = new Media(_libVLC, new Uri(videoPath)))
        {
            _mediaPlayer.Play(media);
        }
    }

I would really like to know why the audio quality is so bad, or where I made a mistake.

11 Replies

J0nathan550•5w ago

I have a bad feeling that WinForms library has a poor quality. In WPF or Avalonia I never had issues like this. Can you share full source code? as zip file

FichierCorrompuOP•5w ago

what file do you need exactly ? Or do you want the full project files ?

J0nathan550•5w ago

I need project file yes exclude bin, obj.

FichierCorrompuOP•5w ago

https://www.swisstransfer.com/d/d9b90079-6612-4476-8098-a42aeae31fd9 here you are

J0nathan550•5w ago

what is "AxWMPLib"?

FichierCorrompuOP•5w ago

Its for the Windows media player I use it for the preview of the video

J0nathan550•5w ago

that is the problem. You are using old windows media player. Not the LibVLC. You should use just https://github.com/videolan/libvlcsharp

GitHub

GitHub - videolan/libvlcsharp: Cross-platform .NET/Mono bindings fo...

Cross-platform .NET/Mono bindings for LibVLC. Contribute to videolan/libvlcsharp development by creating an account on GitHub.

FichierCorrompuOP•5w ago

I don't understand, i use the old Windows Media Player for the preview in the 1rst window of the software (and the audio if fine here), and for the main video viewer on the 2nd screen, it use the LibVLCSharp, not the Windows media player.

Stone_Red•2w ago

Hi there, I just had the same issue. In my case the audio resampler was the problem because it defaulted to the "ugly" resampler. Setting --audio-resampler=speex_resampler in the LibVLC constructor fixed the issue. I hope it helps

FichierCorrompuOP•2w ago

Oh bro it works, thank you so much ! How did you find that ?

Stone_Red•2w ago

You are welcome I enabled the debug logs (by passing true to the LibVLC constructor) and found these two lines:

[000001ce02f51a50] main audio resampler debug: looking for audio resampler module matching "any": 2 candidates
[000001ce02f51a50] main audio resampler debug: using audio resampler module "ugly"

[000001ce02f51a50] main audio resampler debug: looking for audio resampler module matching "any": 2 candidates
[000001ce02f51a50] main audio resampler debug: using audio resampler module "ugly"

I thought "ugly" doesn't sound good so I checked how I can change the resampler and found that CLI option. The CLI arguments are listed here btw: https://wiki.videolan.org/VLC_command-line_help/

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Poor audio quality with LibVLCSharp

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