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The LCK Unreal SDK is structured around a ULCKSubsystem (WorldSubsystem) that creates and owns a single ULCKService instance responsible for all recording, preview and telemetry operations, while the user-facing tablet is implemented as an ALCKTablet actor (BP_LCKTablet) that owns its own ULCKTabletDataModel (persisted settings) and ULCKUISystem (3D UI) and communicates with the service only via direct function calls.
ComponentRoleLifetimeHow to Access
ULCKSubsystemWorldSubsystem → creates and owns the single ULCKService instanceWorld lifetimeGetWorld()->GetSubsystem()->GetService()
ULCKServiceCentral SDK brain: recording, preview, profiles, delegates, telemetrySingleton per player sessionAlways via ULCKSubsystem
**ALCKTablet **+ BP_LCKTabletReady-to-use actor containing full 3D UI + recording logicOne per tablet in the LevelDrop the provided **BP_LCKTablet **Blueprint
ULCKDummyRecorderController
(will be renamed)		Handles record button state & timerOwned by ALCKTabletUsed internally by the tablet
ULCKUISystemFull 3D UI orchestrator (all buttons, tabs, show/hide groups)Component of the tabletManages all UI components and data binding
ULCKTabletDataModelCentral data container (mic state, quality, orientation, camera settings, etc.)Owned by tabletAll UI elements bind to it automatically

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Recording profile

The Recording Profiles system defines video capture presets for the LCK Tablet. These profiles are managed by **ULCKTabletDataModel **in the **LCKUI **plugin and are fully configurable in Blueprints.

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Key Components

  • ULCKTabletDataModel (LCKUI plugin)
    • Owns all recording settings
    • Exposes four FLCKRecordingProfile instances: Profile_SD, Profile_HD, Profile_2K, **Profile_4K **
    • Exposes **CurrentVideoQuality **(enum: SD, HD, 2K, 4K)
    • Exposes **CurrentScreenOrientation **(enum: Landscape, Portrait)
  • FLCKRecordingProfile (LCKTablet plugin)
    • USTRUCT containing:
      • **ELCKRecordingResolution **Resolution
      • **ELCKFramerate **Framerate
      • **int32 **VideoBitrate
      • **int32 **AudioBitrate
      • **int32 **Samplerate
  • ULCKService (LCKTablet plugin)
    • Exposes ApplyRecordingSettings(int32 Width, int32 Height, int32 Framerate, int32 VideoBitrate, int32 AudioBitrate, int32 Samplerate)
    • Forwards parameters to ULCKRecorderSubsystem
Profile1 Recording profile Default values: **Note: **2K and 4K resolution are only available on Windows.
ProfileResolutionFramerateVideo BitrateAudio Bitrate
SD1280×72030 fps4 Mbps128 kbps
HD1920×108060 fps10 Mbps256 kbps
2K2560×144060 fps20 Mbps320 kbps
4K3840×216060 fps35 Mbps320 kbps
Profile2 These recording profiles ca be modified in the **BP_LCKTablet **blueprint to be overwritten as follow : Profile3

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Telemetry

  • Telemetry is anonymous. DeviceId is an irreversible MD5 hash.
  • Define the TrackingID inside DefaultGame.ini as shown in the section “Preview Integration Guide”
EventTriggerExample context sent
GameInitializedPlugin loadedEngine version, graphics API
**ServiceCreated **/ DisposedULCKService init/shutdown–
RecordingStartedUser starts recordingResolution, FPS, bitrates
RecordingStoppedUser stops recordingDuration, stop reason
PhotoCapturedTakePhoto() calledResolution, format (PNG)
**RecorderError **/ SdkErrorAny failureError message + code