Studio Mode & Transitions

This guide covers Studio Mode (preview/program workflow, including direct T-Bar control) and scene transitions (selecting transitions, setting durations, and reacting to transition events).

Studio Mode

Function	Description
`SetStudioModeEnabled(Enabled)`	Enable or disable Studio Mode
`GetStudioModeEnabled()`	Fetch current Studio Mode state
`IsStudioModeEnabled()`	Check if Studio Mode is enabled (cached)
`SetCurrentPreviewScene(Name)`	Set the preview scene (Studio Mode only)
`GetCurrentPreviewScene()`	Fetch current preview scene
`GetPreviewSceneName()`	Get preview scene name (cached)
`TriggerStudioModeTransition()`	Transition preview to program

T-Bar control: GetClient()->GetStudioMode()->SetTBarPosition(Position, bRelease) drives the Studio Mode transition T-Bar directly. Position is clamped between 0.0 and 1.0. Pass bRelease = false to hold the bar at a position (e.g. to scrub it from a Sequencer float track) and true to release and let OBS complete the transition. Requires Studio Mode and a non-Cut transition.

// Hold the T-Bar at the halfway point, then release to complete the transition
UInhyeongOBSWebSocketClient* Client = OBS->GetClient();
Client->GetStudioMode()->SetTBarPosition(0.5f, /*bRelease=*/false);
// ...later...
Client->GetStudioMode()->SetTBarPosition(1.0f, /*bRelease=*/true);

Note: Preview scene functions only work when Studio Mode is enabled.

Transitions

Function	Description
`GetSceneTransitionList()`	Refresh list of available transitions
`GetCurrentSceneTransition()`	Fetch current transition details
`SetCurrentSceneTransition(Name)`	Set the active scene transition
`SetCurrentSceneTransitionDuration(Ms)`	Set transition duration in milliseconds
`GetCurrentTransitionName()`	Get current transition name (cached)
`GetCurrentTransitionDuration()`	Get current duration in ms (cached)
`IsTransitionActive()`	Check if a transition is currently in progress
`GetCachedTransitions()`	Get locally cached transition list

Note: Fixed transitions (like Cut) don’t support duration changes, so check bTransitionFixed before modifying the duration.

Events

Studio Mode

OnStudioModeStateChanged(bEnabled): Studio Mode enabled or disabled
OnCurrentPreviewSceneChanged(SceneName, SceneUuid): Preview scene changed

Transitions

OnCurrentTransitionChanged(TransitionName): Active transition changed
OnTransitionDurationChanged(DurationMs): Transition duration changed
OnTransitionStarted(TransitionName): A scene transition started
OnTransitionEnded(TransitionName): A scene transition completed
OnTransitionVideoEnded(TransitionName): Transition video ended (useful for Stingers)
OnTransitionListUpdated: Transition list was refreshed

For the full catalog of events across every OBS domain, see the Events reference.