Ue Sequencer And Cinematics

Sequencer & cinematics

Sequencer is Unreal's non-linear timeline editor. A Level Sequence (ULevelSequence) binds actors and animates their properties via tracks; you play it at runtime through a ULevelSequencePlayer for cutscenes or scripted moments, and feed gameplay events back through event tracks or the OnFinished delegate.

When to use this skill

• Triggering a cutscene or scripted in-game beat from C++ and reacting when it ends.
• Overriding which actors a sequence controls at runtime (dynamic/spawned characters).
• Animating a film-style camera (focal length, aperture, depth of field) via Cine Camera.
• Firing gameplay functions at exact timeline positions (event tracks / Director blueprint).
• Using Movie Render Queue for offline high-quality output from a sequence asset.

The pieces

Modules to add to your .Build.cs:

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"LevelSequence", "MovieScene", "CinematicCamera"

For Movie Render Queue also add "MovieRenderPipelineCore" (and enable the plugin).

Playing a sequence from C++

The factory method ULevelSequencePlayer::CreateLevelSequencePlayer spawns a transient ALevelSequenceActor, initialises its player, and returns the player ready to use. The out-param SeqActor receives the spawned actor (useful for lifecycle control).

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#include "LevelSequence.h"
#include "LevelSequenceActor.h"
#include "LevelSequencePlayer.h"
#include "MovieSceneSequencePlayer.h"

// Called from BeginPlay or a gameplay event — never from a constructor.
void AMyDirector::PlayCutscene()
{
    if (!CutsceneAsset) { return; }  // UPROPERTY TObjectPtr<ULevelSequence> CutsceneAsset

    FMovieSceneSequencePlaybackSettings Settings;
    // Settings.bAutoPlay = false;   // default; we call Play() explicitly
    // Settings.LoopCount.Value = 0; // play once; -1 = infinite

    ALevelSequenceActor* SeqActor = nullptr;
    ULevelSequencePlayer* Player = ULevelSequencePlayer::CreateLevelSequencePlayer(
        GetWorld(), CutsceneAsset, Settings, SeqActor);

    if (Player)
    {
        Player->OnFinished.AddDynamic(this, &AMyDirector::OnCutsceneDone);
        Player->Play();
    }
}

UFUNCTION()
void AMyDirector::OnCutsceneDone()
{
    // Re-enable player input, restore camera, advance game state.
}

If you placed an ALevelSequenceActor in the level, prefer:

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// PlacedSeqActor is a UPROPERTY TObjectPtr<ALevelSequenceActor> set in the editor.
if (ULevelSequencePlayer* P = PlacedSeqActor->GetSequencePlayer())
{
    P->OnFinished.AddDynamic(this, &AMyDirector::OnCutsceneDone);
    P->Play();
}

Key player methods (all on UMovieSceneSequencePlayer, base of ULevelSequencePlayer):

Source: Runtime/MovieScene/Public/MovieSceneSequencePlayer.h — Play:193, PlayLooping:208, Stop:220, Pause:212, SetPlaybackPosition:344, OnFinished:426.

Bindings — possessables vs spawnables

A possessable references a pre-existing level actor (linked by soft object path). A spawnable is an actor template embedded in the sequence that the player spawns/destroys for the duration of playback.

• Possessable: stable cross-level binding; breaks if the target actor is renamed, moved to another level, or replaced at runtime without rebinding.
• Spawnable: self-contained; the sequence owns the actor's lifetime, making the sequence portable and usable without placing anything in the level. Prefer spawnables for cinematic- only characters or props that don't need to interact with gameplay after the cutscene.

Runtime binding override

For dynamic actors (spawned at runtime, procedurally placed), override a binding on the ALevelSequenceActor rather than editing the asset:

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// Binding must be tagged in the Sequencer UI (RMB on binding > Tags…).
// FMovieSceneObjectBindingID can come from FindNamedBinding() or a designer-exposed
// UPROPERTY(EditAnywhere) FMovieSceneObjectBindingID.
PlacedSeqActor->SetBindingByTag(
    FName("HeroCharacter"),        // tag set in the Sequencer UI
    {DynamicallySpawnedHero},      // TArray<AActor*>
    /*bAllowBindingsFromAsset=*/false);

SetBinding / SetBindingByTag / AddBinding / ResetBindings are all on ALevelSequenceActor (LevelSequenceActor.h:178–238). They write into the actor's UMovieSceneBindingOverrides object without modifying the sequence asset.

Full binding and track internals: references/tracks-and-bindings.md.

Cameras & camera cuts

Add a Camera Cuts track to the sequence to drive which camera the viewer sees. During playback the player overrides the viewport to the active cut camera; on finish the view returns to the player camera (controllable via FLevelSequenceCameraSettings).

Use ACineCameraActor / UCineCameraComponent for cinematic look. Key properties (all UPROPERTY(Interp, …), so they can be keyframed in Sequencer):

UCineCameraComponent inherits from UCameraComponent; ACineCameraActor wraps it and adds LookatTrackingSettings. Source: Runtime/CinematicCamera/Public/CineCameraComponent.h and CineCameraActor.h.

Camera and camera-cuts deep dive: references/cameras-and-cuts.md.

Event tracks (timeline → gameplay)

Event tracks fire at keyframe positions and invoke functions on the sequence's ULevelSequenceDirector subclass (a Blueprint). The director receives bound-object references through GetBoundObjects(FMovieSceneObjectBindingID) / GetBoundActor(…).

Use event tracks to spawn effects, toggle gameplay flags, or advance state at exact cinematic beats — the timeline analog of anim notifies (see ue-animation-system). For gameplay → timeline (driving a sequence from code), just call SetPlaybackPosition or PlayTo.

The Director's player pointer is UPROPERTY(BlueprintReadOnly) TObjectPtr<ULevelSequencePlayer> Player (LevelSequenceDirector.h:131).

Movie Render Queue

For offline renders (trailers, pre-rendered cutscenes), use the Movie Render Pipeline plugin rather than the editor's legacy "Render Movie" button. It supports multi-sample anti- aliasing accumulation, warmup frames, EXR / PNG / ProRes output, and render passes.

The queue is managed via editor subsystem (MoviePipelineQueueSubsystem) or Python/Blueprint scripting; runtime rendering in a packaged build uses UMoviePipeline directly.

Plugin headers live in: Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/

Full MRQ setup and scripting: references/movie-render-queue.md.

Gameplay vs cinematic control

• Disable player input with APlayerController::SetInputMode / DisableInput during non- interactive cutscenes; restore in OnFinished.
• For interactive moments (player can still move), skip disabling input and use the sequence only for cameras or specific actors.
• Networked cinematics: trigger the sequence on every client via an RPC/replicated event. ALevelSequenceActor has bReplicatePlayback (LevelSequenceActor.h:117) but Sequencer playback itself is not automatically synchronised — coordinate timing explicitly. See ue-networking-and-replication.

Gotchas

• Possessable binding breaks on rename/move — if the bound actor is renamed or moved to a sublevel, the soft-object-path reference breaks. Use tags + SetBindingByTag at runtime.
• Forgetting to restore input/camera — always hook OnFinished and undo any cinematic-mode state (input, camera, HUD visibility) there.
• Null player after CreateLevelSequencePlayer — this returns null if GetWorld() is null (CDO, editor context) or LevelSequence is null. Guard both.
• Replicated playback is not frame-accurate — bReplicatePlayback gives clients a status update, not a sample-accurate sync. For frame-locked sync, implement your own timing.
• Event track functions must exist on the Director blueprint — functions called by event tracks must be BlueprintCallable and present in the Director class; mismatches are silent.
• Forgetting module deps — missing "LevelSequence" in .Build.cs causes include errors for ULevelSequencePlayer and ALevelSequenceActor.
• Completion mode — by default Sequencer restores animated properties on stop. Set EMovieSceneCompletionModeOverride::ForceKeepState via Player->SetCompletionModeOverride if you want animated transforms to persist after the sequence ends.

Version notes

• ALevelSequenceActor::SequencePlayer is deprecated in 5.4; always use GetSequencePlayer() (LevelSequenceActor.h:153).
• The FGuid FindBindingFromObject(UObject*, UObject*) overload is deprecated in 5.5; use the SharedPlaybackState variant.
• For Control Rig-authored animation played inside Sequencer, see ue-control-rig-and-ik.
• For skeletal animation tracks and Anim Notifies, see ue-animation-system.

References & source material

Engine source (UE 5.8, under Engine/Source/Runtime/):

• LevelSequence/Public/LevelSequence.h — ULevelSequence, MovieScene, DirectorClass.
• LevelSequence/Public/LevelSequenceActor.h — ALevelSequenceActor, GetSequencePlayer:153, SetBinding:178, SetBindingByTag:190, FindNamedBinding:244, bReplicatePlayback:117.
• LevelSequence/Public/LevelSequencePlayer.h — ULevelSequencePlayer, CreateLevelSequencePlayer:106, OnCameraCut:110, GetActiveCameraComponent:114.
• LevelSequence/Public/LevelSequenceDirector.h — ULevelSequenceDirector, Player:131, GetBoundObjects:65, GetBoundActor:95.
• MovieScene/Public/MovieSceneSequencePlayer.h — Play:193, PlayLooping:208, Stop:220, Pause:212, SetPlaybackPosition:344, OnFinished:426, OnStop:418, OnPlay:410.
• MovieScene/Public/MovieSceneSequencePlaybackSettings.h — FMovieSceneSequencePlaybackSettings.
• MovieScene/Public/MovieScene.h — UMovieScene (tracks/sections/bindings model).
• CinematicCamera/Public/CineCameraComponent.h — UCineCameraComponent, CurrentFocalLength:66, CurrentAperture:70, Filmback:38, FocusSettings:52.
• CinematicCamera/Public/CineCameraActor.h — ACineCameraActor, GetCineCameraComponent:90.

Plugin source (UE 5.8):

• Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/MoviePipelineQueue.h

Official docs (UE 5.8, verified):

• Cinematics and Sequencer — https://dev.epicgames.com/documentation/unreal-engine/cinematics-and-movie-making-in-unreal-engine
• Sequencer Overview — https://dev.epicgames.com/documentation/unreal-engine/unreal-engine-sequencer-movie-tool-overview
• Spawnables and Possessables — https://dev.epicgames.com/documentation/unreal-engine/spawn-temporary-actors-in-unreal-engine-cinematics
• Movie Render Pipeline — https://dev.epicgames.com/documentation/unreal-engine/movie-render-pipeline-in-unreal-engine
• Cameras in Sequencer — https://dev.epicgames.com/documentation/unreal-engine/movie-and-cinematic-cameras-in-unreal-engine

Deep-dive references in this skill:

• references/tracks-and-bindings.md — MovieScene data model (tracks, sections, channels), binding types, runtime binding override API.
• references/cameras-and-cuts.md — Cine Camera properties, Camera Cuts track, camera blending, OnCameraCut delegate.
• references/level-sequence-and-player.md — full player API, playback settings, completion modes, Director, event tracks.
• references/movie-render-queue.md — MRQ pipeline, scripting renders, runtime builds, render passes.