fix(tvos): subtitle HDR path and player dispose hardening

ios/Runner/MpvPlayer/MpvPlayerCore.swift

@@ -12,6 +12,7 @@ class MpvPlayerCore: MpvPlayerCoreBase {
   private weak var window: UIWindow?
   private var mainBlankView: UIView?
   private var isVisible = false
+  private var isDisposed = false
 
   var isPipStarting = false
 
@@ -317,6 +318,19 @@ class MpvPlayerCore: MpvPlayerCoreBase {
   #endif
 
   func dispose() {
+    // Guard double-dispose: the plugin calls dispose() then drops the
+    // strong ref, which fires deinit → dispose() again. The second call
+    // would re-enter and crash on weak-ref formation during dealloc.
+    guard !isDisposed else { return }
+    isDisposed = true
+
+    // Reset the HDMI mode hint synchronously while self is still alive
+    // and on main. An async-to-main dispatch here would be drained after
+    // dealloc (the plugin sets playerCore = nil right after this call
+    // returns), leaving the link stuck at the last clip's refresh rate.
+    updateDisplayCriteria(
+      doviProfile: 0, doviLevel: 0, fps: 0, width: 0, height: 0, sigPeak: 0)
+
     NotificationCenter.default.removeObserver(self)
     #if os(iOS)
       ExternalDisplayManager.shared.detach(core: self)

shared/apple/MpvPlayer/MpvPlayerCoreBase.swift

@@ -439,10 +439,6 @@ class MpvPlayerCoreBase: NSObject {
     cachedContainerFps = 0
     cachedLastSigPeak = 0
     cacheLock.unlock()
-    DispatchQueue.main.async { [weak self] in
-      self?.updateDisplayCriteria(
-        doviProfile: 0, doviLevel: 0, fps: 0, width: 0, height: 0, sigPeak: 0)
-    }
 
     let mpvHandle = mpv
     mpv = nil
@@ -477,6 +473,12 @@ class MpvPlayerCoreBase: NSObject {
       #if targetEnvironment(simulator)
         checkError(mpv_set_option_string(mpv, "avfoundation-composite-osd", "no"))
         checkError(mpv_set_option_string(mpv, "hwdec", "no"))
+      #elseif os(tvOS)
+        // tvOS HDR is HDMI mode switching, not EDR — an SDR sibling layer
+        // doesn't dim the video, so skip the per-frame CI composite that
+        // round-trips BT.2020/PQ through linear P3.
+        checkError(mpv_set_option_string(mpv, "avfoundation-composite-osd", "no"))
+        checkError(mpv_set_option_string(mpv, "hwdec", "videotoolbox"))
       #else
         checkError(mpv_set_option_string(mpv, "avfoundation-composite-osd", "yes"))
         checkError(mpv_set_option_string(mpv, "hwdec", "videotoolbox"))