add dotnet-libvlc skill for VLC multimedia framework

README.md

@@ -79,7 +79,7 @@ skills/<skill-name>/
 
 <!-- BEGIN GENERATED CATALOG -->
 
-This catalog currently contains **62** skills.
+This catalog currently contains **63** skills.
 
 ### Core
 
@@ -124,6 +124,7 @@ This catalog currently contains **62** skills.
 
 | Skill | Version | Description |
 |-------|---------|-------------|
+| [`dotnet-libvlc`](skills/dotnet-libvlc/) | `1.0.0` | Expert knowledge of the libvlc C API (3.x and 4.x), the multimedia framework behind VLC media player. Use when helping with LibVLC or LibVLCSharp for media playback, streaming, or transcoding. |
 | [`dotnet-winforms`](skills/dotnet-winforms/) | `1.0.0` | Build, maintain, or modernize Windows Forms applications with practical guidance on designer-driven UI, event handling, data binding, and migration to modern .NET. |
 | [`dotnet-winui`](skills/dotnet-winui/) | `1.0.0` | Build or review WinUI 3 applications with the Windows App SDK, modern Windows desktop patterns, packaging decisions, and interop boundaries with other .NET stacks. |
 | [`dotnet-wpf`](skills/dotnet-wpf/) | `1.0.0` | Build and modernize WPF applications on .NET with correct XAML, data binding, commands, threading, styling, and Windows desktop migration decisions. |
@@ -337,5 +338,6 @@ This catalog builds on the work of many open-source projects and their authors:
 | [Semantic Kernel](https://github.com/microsoft/semantic-kernel) | Microsoft | MIT |
 | [Entity Framework Core](https://github.com/dotnet/efcore) | Microsoft, .NET Foundation | MIT |
 | [ML.NET](https://github.com/dotnet/machinelearning) | Microsoft, .NET Foundation | MIT |
+| [LibVLCSharp](https://github.com/videolan/libvlcsharp) | VideoLAN | LGPL-2.1 |
 
 *Want your project credited? Add a skill and include yourself in this list!*

skills/dotnet-libvlc/SKILL.md

@@ -0,0 +1,38 @@
+---
+name: dotnet-libvlc
+version: 1.0.0
+category: Desktop
+description: Expert knowledge of the libvlc C API (3.x and 4.x), the multimedia framework behind VLC media player. Use when helping with LibVLC or LibVLCSharp for media playback, streaming, or transcoding.
+compatibility: .NET 6+, .NET Standard 2.0+, .NET Framework 4.6.1+
+---
+
+# LibVLC Skill
+
+You are an expert assistant for developers using **libvlc** (both 3.x and 4.x), the multimedia framework behind VLC media player. You help with API usage, code generation, debugging, and architecture decisions across all supported languages and platforms.
+
+## Version markers
+
+Throughout the reference, inline markers indicate version-specific APIs:
+- **No marker** — same in both 3.x and 4.x
+- **`[3.x]`** — only in libvlc 3.x (removed in 4.x)
+- **`[4.x]`** — new in libvlc 4.x
+- **`[4.x change]`** — exists in both but signature changed
+
+When generating code, **ask the user which version they target** if not already clear from context.
+
+## Reference
+
+For complete API signatures, code examples, language bindings, platform integration, streaming recipes, troubleshooting, and migration guidance, see [libvlc-skill.md](libvlc-skill.md).
+
+Sections in the reference:
+- **§1** Architecture Overview — pipeline, object model, single-instance rule
+- **§2** Core Concepts — lifecycle, threading rules, event system, error handling, logging, plugin discovery
+- **§3** API Reference — instance, media, media player, media list, events, dialog, discoverer, renderer, VLM, tracklist, program, GPU rendering, A-B loop, picture API
+- **§4** Language Bindings — C, C#/LibVLCSharp, Python, Java/vlcj, Go, C++/libvlcpp
+- **§5** Common Workflows — playback, metadata, thumbnails, playlists, Chromecast, transcoding, streaming, recording, track selection, mosaic, mobile lifecycle
+- **§6** Platform Integration — Windows (Win32, WPF, WinForms, D3D11), macOS/iOS, Linux (GTK, wxWidgets), Qt, Android, Avalonia
+- **§7** Streaming & Transcoding — sout chains, protocols, Chromecast
+- **§8** Troubleshooting — deadlocks, no audio/video, memory leaks, common pitfalls
+- **§9** CLI Options
+- **§10** Deprecated APIs
+- **§13** Migration Guide (3.x → 4.x) — signature changes, removed APIs, new APIs, type changes