fix native playback cocoa pods build

Dreamio/DreamioWebViewController.swift

@@ -368,6 +368,12 @@ final class DreamioWebViewController: UIViewController {
 
     @MainActor
     private func resolveAndPresentNativePlayback(_ request: NativePlaybackRequest) async {
+        guard VLCNativePlaybackBackend.isAvailable else {
+            lastNativePlaybackURL = nil
+            showNativePlaybackUnavailableAlert()
+            return
+        }
+
         do {
             let resolved = try await streamResolver.resolve(request: request)
 #if DEBUG
@@ -407,6 +413,16 @@ final class DreamioWebViewController: UIViewController {
         present(alert, animated: true)
     }
 
+    private func showNativePlaybackUnavailableAlert() {
+        let alert = UIAlertController(
+            title: "Native playback needs CocoaPods",
+            message: "This build was opened from Dreamio.xcodeproj or built before MobileVLCKit was installed. Run pod install, open Dreamio.xcworkspace, then build again to play MKV, AVI, and WebM streams.",
+            preferredStyle: .alert
+        )
+        alert.addAction(UIAlertAction(title: "Close", style: .cancel))
+        present(alert, animated: true)
+    }
+
 #if DEBUG
     private func logDiagnostic(type: String, payload: Any, pageURL: String?) {
         let redactedPageURL = pageURL.map(redactedURLString) ?? "unknown"

Dreamio/VLCNativePlaybackBackend.swift

@@ -5,6 +5,14 @@ import MobileVLCKit
 #endif
 
 final class VLCNativePlaybackBackend: NSObject, NativePlaybackBackend {
+    static var isAvailable: Bool {
+#if canImport(MobileVLCKit)
+        true
+#else
+        false
+#endif
+    }
+
     let view = UIView()
     var onReady: (() -> Void)?
     var onFailure: ((Error) -> Void)?