使用Vlc.DotNet与LibVLCSharp播放视频时仅出声音却显示黑屏问题排查

我搭建了一个简单的WinForms解决方案，核心是集成两个基于LibVLC的视频播放器，同时搭配了一个按钮来触发二者同步播放视频，具体细节如下：

核心组件说明 #

• 采用Vlc.DotNet和LibVLCSharp两个LibVLC封装库实现播放器功能
• 开发过程均严格参照对应库的官方示例进行实现
• 项目附带两个日志文件：Loglibvlcsharp.txt 和 LogVlcDotNet，用于排查播放相关问题

完整实现代码 #

public partial class QueueDisplayVideoView : Form {
    private string[] paths, files;
    private int videoIndex = 0;
    public LibVLC _libVLC;
    public MediaPlayer _mp;
    public LibVLCSharp.Shared.Media media;
    
    public QueueDisplayVideoView() {
        InitializeComponent();
        Core.Initialize();
        _libVLC = new LibVLC(enableDebugLogs:true);
        _libVLC.SetLogFile(@"C:\Temp\LogLib.txt");
        _mp = new MediaPlayer(_libVLC);
        videoView.MediaPlayer = _mp;
    }
    
    protected override void OnLoad(EventArgs e) {
        _presenter.OnViewReady();
        base.OnLoad(e);
        LoadVideoFiles();
        SetPlayerAspectRatio();
        //StartAutoPlay();
    }
    
    private void StartAutoPlay() {
        vlcControl.Play(new Uri(paths[videoIndex]));
        _mp.Play(new LibVLCSharp.Shared.Media(_libVLC, new Uri(paths[videoIndex])));
    }
    
    private void LoadVideoFiles() {
        var path = some path
        paths = Directory.GetFiles(path, "*", SearchOption.AllDirectories);
        files = new string[paths.Length];
        for (int i = 0; i < paths.Length; i++) {
            files[i] = Path.GetFileName(paths[i]);
        }
    }
    
    private void SetPlayerAspectRatio() {
        var videoWidth = vlcControl.Width.ToString();
        var videoHieght = vlcControl.Height.ToString();
        vlcControl.Video.AspectRatio = videoWidth + ":" + videoHieght;
    }
    
    private void vlcControl_VlcLibDirectoryNeeded(object sender, Vlc.DotNet.Forms.VlcLibDirectoryNeededEventArgs e) {
        // var currentAssembly = System.Reflection.Assembly.GetEntryAssembly();
        var currentDirectory = @"Q:\bin";
        //new FileInfo(currentAssembly.Location).DirectoryName;
        // Default installation path of VideoLAN.LibVLC.Windows
        var fullPath = Path.Combine(currentDirectory, "libvlc", IntPtr.Size == 4 ? "win-x86" : "win-x64");
        e.VlcLibDirectory = new DirectoryInfo(fullPath);
    }
    
    private void vlcControl_EndReached(object sender, Vlc.DotNet.Core.VlcMediaPlayerEndReachedEventArgs e) {
        GetNextVideoIndex();
        ThreadPool.QueueUserWorkItem(_ => vlcControl.Play(new Uri(paths[videoIndex])));
    }
    
    private void button1_Click(object sender, EventArgs e) {
        StartAutoPlay();
    }
    
    private void GetNextVideoIndex() {
        if (videoIndex < files.Length - 1) {
            videoIndex = videoIndex + 1;
        } else {
            videoIndex = 0;
        }
    }
}

注意：代码中var path = some path需要替换为实际的视频文件目录路径

内容的提问来源于stack exchange，提问作者styx