--- a/Sources/AetherEngine/Video/VTCapabilityProbe.swift
+++ b/Sources/AetherEngine/Video/VTCapabilityProbe.swift
@@ -9,9 +9,14 @@
 
     /// True only when AVPlayer's HLS-fMP4 pipeline can HW-decode AV1. Apple's dav1d (macOS 14+/iOS 17+) is reachable via direct file playback but NOT via AVPlayer HLS in practice (verified 2026-05-14 on M1 macOS 26.4): VTIsHardwareDecodeSupported returns false, AVURLAsset.isPlayable returns false. False routes to SoftwarePlaybackHost/dav1d.
     static let av1Available: Bool = {
+        // Modified for Teevo (products/apple-media), 9 October 2026: the
+        // tvOS and iOS 26.1 SDKs mark this call unavailable, so it is made on
+        // macOS only. scripts/fetch-aetherengine.mjs applies this change.
+        #if os(macOS)
         if #available(tvOS 26.2, iOS 26.2, macOS 16.0, visionOS 26.2, *) {
             VTRegisterSupplementalVideoDecoderIfAvailable(kCMVideoCodecType_AV1)
         }
+        #endif
         let supported = VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1)
         EngineLog.emit("[VTProbe] codec=av01 hwSupported=\(supported)", category: .engine)
         return supported