[video_player_avfoundation] fix video playback speed resetting on iOS 16+

packages/video_player/video_player_avfoundation/darwin/RunnerTests/VideoPlayerTests.m

@@ -839,6 +839,60 @@ - (void)testFailedToLoadVideoEventShouldBeAlwaysSent {
   [self waitForExpectationsWithTimeout:10.0 handler:nil];
 }
 
+- (void)testPlaybackSpeedRemainsAfterSeek {
+    NSObject<FlutterTextureRegistry> *mockTextureRegistry =
+            OCMProtocolMock(@protocol(FlutterTextureRegistry));
+    NSObject<FlutterPluginRegistrar> *registrar =
+            [GetPluginRegistry() registrarForPlugin:@"PlaybackSpeedRemainsAfterSeek"];
+    NSObject<FlutterPluginRegistrar> *partialRegistrar = OCMPartialMock(registrar);
+    OCMStub([partialRegistrar textures]).andReturn(mockTextureRegistry);
+
+    // Create mock video output and AVPlayer
+    AVPlayerItemVideoOutput *mockVideoOutput = OCMPartialMock([[AVPlayerItemVideoOutput alloc] init]);
+    StubAVPlayer *mockAVPlayer = [[StubAVPlayer alloc] init];
+
+    // Set up the player factory
+    FVPVideoPlayerPlugin *videoPlayerPlugin = [[FVPVideoPlayerPlugin alloc]
+            initWithAVFactory:[[StubFVPAVFactory alloc] initWithPlayer:mockAVPlayer output:mockVideoOutput]
+           displayLinkFactory:nil
+                    registrar:partialRegistrar];
+
+    // Initialize the video player plugin
+    FlutterError *initError;
+    [videoPlayerPlugin initialize:&initError];
+    XCTAssertNil(initError);
+
+    FVPCreationOptions *create = [FVPCreationOptions makeWithAsset:nil
+                                                               uri:@"https://flutter.github.io/assets-for-api-docs/assets/videos/hls/bee.m3u8"
+                                                       packageName:nil
+                                                        formatHint:nil
+                                                       httpHeaders:@{}];
+    FlutterError *createError;
+    NSNumber *textureId = [videoPlayerPlugin createWithOptions:create error:&createError];
+    XCTAssertNil(createError);
+
+    // Ensure player was created
+    FVPVideoPlayer *player = videoPlayerPlugin.playersByTextureId[textureId];
+    XCTAssertNotNil(player);
+    AVPlayer *avPlayer = player.player;
+
+    // Set playback speed to 2.0
+    [player setPlaybackSpeed:2.0];
+    XCTAssertEqual(avPlayer.rate, 2.0, @"Playback speed should be set to 2.0");
+
+    // Perform a seek operation
+    [videoPlayerPlugin seekTo:1234
+                    forPlayer:textureId.integerValue
+                   completion:^(FlutterError *_Nullable error) {
+                       XCTAssertNil(error);
+                   }];
+
+    // After seek, verify playback speed remains unchanged
+    XCTAssertEqual(avPlayer.rate, 2.0, @"Playback speed should remain 2.0 after seeking");
+    XCTAssertEqual(avPlayer.defaultRate, 2.0, @"Default playback speed should be 2.0 after seeking");
+}
+
+
 #if TARGET_OS_IOS
 - (void)validateTransformFixForOrientation:(UIImageOrientation)orientation {
   AVAssetTrack *track = [[FakeAVAssetTrack alloc] initWithOrientation:orientation];

packages/video_player/video_player_avfoundation/darwin/video_player_avfoundation/Sources/video_player_avfoundation/FVPVideoPlayer.m

@@ -492,7 +492,10 @@ - (void)setPlaybackSpeed:(double)speed {
     }
     return;
   }
-
+  if (@available(iOS 16, *)) {
+      // this will avoid resetting playback speed to 1.0x on seeking
+      _player.defaultRate = speed;
+  }
   _player.rate = speed;
 }
 

packages/video_player/video_player_avfoundation/test/avfoundation_video_player_test.dart

@@ -374,5 +374,20 @@ void main() {
             ),
           ]));
     });
+
+    test('playback speed should remain after seeking', () async {
+      // Set initial playback speed
+      await player.setPlaybackSpeed(1, 2.0); // Set to 2.0x
+      expect(log.log.last, 'setPlaybackSpeed');
+      expect(log.playbackSpeed, 2.0);
+
+      // Now seek to a different position
+      await player.seekTo(1, const Duration(milliseconds: 5000)); // Seek to 5 seconds
+      expect(log.log.last, 'seekTo');
+      expect(log.position, 5000);
+
+      // After seeking, the playback speed should still be 2.0x
+      expect(log.playbackSpeed, 2.0);
+    });
   });
 }