Optionally force scene switch transitions for all video sources.

Common/Localizable.xcstrings

@@ -58276,6 +58276,9 @@
           }
         }
       }
+    },
+    "Force scene switch transition" : {
+
     },
     "Foreground" : {
       "localizations" : {
@@ -100417,6 +100420,9 @@
           }
         }
       }
+    },
+    "RTMP, SRT(LA), screen capture and media player video sources can instantly be switched to, but if you want consistency you can force scene switch transitions to these as well." : {
+
     },
     "rtmp://a.rtmp.youtube.com/live2" : {
       "localizations" : {

Moblin/Various/Media.swift

@@ -812,16 +812,16 @@ final class Media: NSObject {
     func attachReplaceCamera(
         device: AVCaptureDevice?,
         cameraPreviewLayer: AVCaptureVideoPreviewLayer?,
-        showCameraPreview _: Bool,
-        cameraId: UUID
+        cameraId: UUID,
+        ignoreFramesAfterAttachSeconds: Double
     ) {
         netStream?.attachCamera(
             device,
             cameraPreviewLayer,
             false,
             .off,
             false,
-            0.0,
+            ignoreFramesAfterAttachSeconds,
             replaceVideoCameraId: cameraId
         )
     }

Moblin/Various/Model.swift

@@ -6433,6 +6433,14 @@ final class Model: NSObject, ObservableObject, @unchecked Sendable {
         return Double(database.debug.cameraSwitchRemoveBlackish!)
     }
 
+    private func getIgnoreFramesAfterAttachSecondsReplaceCamera() -> Double {
+        if database.forceSceneSwitchTransition! {
+            return Double(database.debug.cameraSwitchRemoveBlackish!)
+        } else {
+            return 0.0
+        }
+    }
+
     private func attachReplaceCamera(cameraId: UUID) {
         cameraDevice = nil
         cameraPosition = nil
@@ -6441,8 +6449,8 @@ final class Model: NSObject, ObservableObject, @unchecked Sendable {
         media.attachReplaceCamera(
             device: getVideoSourceBuiltinCameraDevice(),
             cameraPreviewLayer: cameraPreviewLayer,
-            showCameraPreview: updateShowCameraPreview(),
-            cameraId: cameraId
+            cameraId: cameraId,
+            ignoreFramesAfterAttachSeconds: getIgnoreFramesAfterAttachSecondsReplaceCamera()
         )
         media.usePendingAfterAttachEffects()
     }

Moblin/Various/Settings.swift

@@ -2677,6 +2677,7 @@ class Database: Codable {
     var pixellateStrength: Float? = 0.3
     var moblink: SettingsMoblinkRelay? = .init()
     var sceneSwitchTransition: SettingsSceneSwitchTransition? = .blur
+    var forceSceneSwitchTransition: Bool? = false
 
     static func fromString(settings: String) throws -> Database {
         let database = try JSONDecoder().decode(
@@ -4609,5 +4610,9 @@ final class Settings {
             realDatabase.sceneSwitchTransition = realDatabase.debug.blurSceneSwitch! ? .blur : .freeze
             store()
         }
+        if realDatabase.forceSceneSwitchTransition == nil {
+            realDatabase.forceSceneSwitchTransition = false
+            store()
+        }
     }
 }

Moblin/View/Settings/Scenes/ScenesSettingsView.swift

@@ -65,15 +65,27 @@ private struct ScenesSwitchTransition: View {
     @State var sceneSwitchTransition: String
 
     var body: some View {
-        Picker("Scene switch transition", selection: $sceneSwitchTransition) {
-            ForEach(sceneSwitchTransitions, id: \.self) { transition in
-                Text(transition)
+        Section {
+            Picker("Scene switch transition", selection: $sceneSwitchTransition) {
+                ForEach(sceneSwitchTransitions, id: \.self) { transition in
+                    Text(transition)
+                }
             }
-        }
-        .onChange(of: sceneSwitchTransition) { _ in
-            model.database.sceneSwitchTransition = SettingsSceneSwitchTransition
-                .fromString(value: sceneSwitchTransition)
-            model.setSceneSwitchTransition()
+            .onChange(of: sceneSwitchTransition) { _ in
+                model.database.sceneSwitchTransition = SettingsSceneSwitchTransition
+                    .fromString(value: sceneSwitchTransition)
+                model.setSceneSwitchTransition()
+            }
+            Toggle("Force scene switch transition", isOn: Binding(get: {
+                model.database.forceSceneSwitchTransition!
+            }, set: { value in
+                model.database.forceSceneSwitchTransition = value
+            }))
+        } footer: {
+            Text("""
+            RTMP, SRT(LA), screen capture and media player video sources can instantly be switched \
+            to, but if you want consistency you can force scene switch transitions to these as well.
+            """)
         }
     }
 }