diff --git a/Packages/FlixyKit/Sources/FlixyProbe/main.swift b/Packages/FlixyKit/Sources/FlixyProbe/main.swift
index f10285c..7154d91 100644
--- a/Packages/FlixyKit/Sources/FlixyProbe/main.swift
+++ b/Packages/FlixyKit/Sources/FlixyProbe/main.swift
@@ -93,7 +93,10 @@ if let hubs = try? await server.homeHubs(),
     )
     if let url = server.transcodeURL(for: request) {
         print("Gegenprobe — Transcoder mit: \(movie.title)")
-        print("   → \(await server.probeStream(url: url))")
+        print("   volle Anfrage: \(await server.probeStream(url: url))")
+        for line in await server.transcoderBisect(ratingKey: movie.ratingKey) {
+            print(line)
+        }
         print()
     }
 } else {
diff --git a/Packages/FlixyKit/Sources/PlexKit/Endpoints/PlexServer+LiveTV.swift b/Packages/FlixyKit/Sources/PlexKit/Endpoints/PlexServer+LiveTV.swift
index 81e0dc7..4af9072 100644
--- a/Packages/FlixyKit/Sources/PlexKit/Endpoints/PlexServer+LiveTV.swift
+++ b/Packages/FlixyKit/Sources/PlexKit/Endpoints/PlexServer+LiveTV.swift
@@ -1492,3 +1492,89 @@ extension CharacterSet {
         charactersIn: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.!~*'()"
     )
 }
+
+
+extension PlexServer {
+    /// Klopft den Transcoder mit verschiedenen Angaben ab.
+    ///
+    /// Eine gewöhnliche Datei scheitert genauso wie Live-TV: der Transcoder
+    /// antwortet auf alles mit einer nackten 400. Damit ist es kein
+    /// Live-Problem, sondern eines der Anfrage selbst — und welche Angabe
+    /// stört, sagt nur das Halbieren.
+    public func transcoderBisect(ratingKey: String) async -> [String] {
+        let session = UUID().uuidString
+        let path = "/library/metadata/\(ratingKey)"
+        let encoded = path.addingPercentEncoding(withAllowedCharacters: .plexParameterAllowed) ?? path
+
+        let variants: [(String, [URLQueryItem])] = [
+            ("nur Pfad und Token", [
+                URLQueryItem(name: "path", value: encoded),
+                URLQueryItem(name: "X-Plex-Token", value: token),
+            ]),
+            ("Pfad unkodiert", [
+                URLQueryItem(name: "path", value: path),
+                URLQueryItem(name: "X-Plex-Token", value: token),
+            ]),
+            ("mit Protokoll und Indizes", [
+                URLQueryItem(name: "path", value: encoded),
+                URLQueryItem(name: "protocol", value: "hls"),
+                URLQueryItem(name: "mediaIndex", value: "0"),
+                URLQueryItem(name: "partIndex", value: "0"),
+                URLQueryItem(name: "X-Plex-Token", value: token),
+            ]),
+            ("dazu die Gerätekennung", [
+                URLQueryItem(name: "path", value: encoded),
+                URLQueryItem(name: "protocol", value: "hls"),
+                URLQueryItem(name: "mediaIndex", value: "0"),
+                URLQueryItem(name: "partIndex", value: "0"),
+                URLQueryItem(name: "X-Plex-Token", value: token),
+                URLQueryItem(name: "X-Plex-Client-Identifier", value: identity.clientIdentifier),
+            ]),
+            ("dazu hasMDE", [
+                URLQueryItem(name: "path", value: encoded),
+                URLQueryItem(name: "protocol", value: "hls"),
+                URLQueryItem(name: "hasMDE", value: "1"),
+                URLQueryItem(name: "mediaIndex", value: "0"),
+                URLQueryItem(name: "partIndex", value: "0"),
+                URLQueryItem(name: "X-Plex-Token", value: token),
+                URLQueryItem(name: "X-Plex-Client-Identifier", value: identity.clientIdentifier),
+            ]),
+            ("dazu die Sitzung", [
+                URLQueryItem(name: "path", value: encoded),
+                URLQueryItem(name: "protocol", value: "hls"),
+                URLQueryItem(name: "hasMDE", value: "1"),
+                URLQueryItem(name: "mediaIndex", value: "0"),
+                URLQueryItem(name: "partIndex", value: "0"),
+                URLQueryItem(name: "session", value: session),
+                URLQueryItem(name: "X-Plex-Session-Identifier", value: session),
+                URLQueryItem(name: "X-Plex-Token", value: token),
+                URLQueryItem(name: "X-Plex-Client-Identifier", value: identity.clientIdentifier),
+            ]),
+        ]
+
+        var lines: [String] = []
+        for (name, items) in variants {
+            lines.append("   \(name): \(await probe(items: items, endpoint: "start.m3u8"))")
+        }
+        // Und derselbe Satz an den Entscheider: er antwortet in Plex' Format
+        // statt mit HTML, wenn er überhaupt antwortet.
+        lines.append("   Entscheider: \(await probe(items: variants.last!.1, endpoint: "decision"))")
+        return lines
+    }
+
+    private func probe(items: [URLQueryItem], endpoint: String) async -> String {
+        guard let baseURL = connection.url,
+              var components = URLComponents(
+                url: baseURL.appending(path: "/video/:/transcode/universal/\(endpoint)"),
+                resolvingAgainstBaseURL: false
+              )
+        else { return "Adresse nicht baubar" }
+
+        components.percentEncodedQuery = items
+            .map { "\($0.name)=\($0.value ?? "")" }
+            .joined(separator: "&")
+        guard let url = components.url else { return "Adresse nicht baubar" }
+
+        return await probeStream(url: url)
+    }
+}