editor.sequencer

Level Sequence and cinematic editing

Version Availability: 6 methods (create, getInfo, getMarkedFrames, addCameraCutTrack, addCameraCut, playback) work on UE 5.6.0+. The remaining 21 methods require UE 5.7+ (SequencerScripting extension libraries are not DLL-exported in 5.6). On 5.6, only the available methods are advertised by system.methods.

`editor.sequencer.create`

Creates a new LevelSequence asset at the given package path.

Parameters:

Name	Type	Required	Description
`path`	string	Yes	Content directory (e.g. "/Game/Sequences")
`name`	string	Yes	Sequence asset name

Returns:

Name	Type	Description
`success`	bool	Whether creation succeeded
`asset_path`	string	Full asset path
`name`	string	Sequence name

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.create", "params": { "path": "/Game/Sequences", "name": "Seq_Intro" } }

`editor.sequencer.getInfo`

Returns metadata about a LevelSequence including frame rates, playback range, and counts.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path

Returns:

Name	Type	Description
`name`	string	Sequence name
`asset_path`	string	Asset path
`display_rate_numerator`	number	Display frame rate numerator
`display_rate_denominator`	number	Display frame rate denominator
`tick_resolution_numerator`	number	Tick resolution numerator
`tick_resolution_denominator`	number	Tick resolution denominator
`playback_range_start`	number	Playback start frame
`playback_range_end`	number	Playback end frame
`binding_count`	number	Number of bindings
`track_count`	number	Number of master tracks
`duration_frames`	number	Duration in frames

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getInfo", "params": { "asset_path": "/Game/Sequences/Seq_Intro" } }

`editor.sequencer.addPossessable`

Adds a possessable binding for an existing actor to the sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`actor_path`	string	Yes	Full path of the actor to bind

Returns:

Name	Type	Description
`success`	bool	Whether binding was created
`binding_id`	string	Binding GUID
`display_name`	string	Binding display name

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addPossessable",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "actor_path": "/Game/Maps/Level.Level:PersistentLevel.Cube" }
}

`editor.sequencer.addSpawnable`

Adds a spawnable binding for an actor class to the sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`actor_class`	string	Yes	Actor class name to spawn

Returns:

Name	Type	Description
`success`	bool	Whether spawnable was created
`binding_id`	string	Binding GUID
`display_name`	string	Binding display name

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addSpawnable",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "actor_class": "PointLight" }
}

`editor.sequencer.getBindings`

Returns all bindings (possessables and spawnables) in a sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path

Returns: Array of objects:

Name	Type	Description
`binding_id`	string	Binding GUID
`display_name`	string	Display name
`binding_type`	string	"spawnable" or "possessable"
`track_count`	number	Number of tracks on this binding

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getBindings", "params": { "asset_path": "/Game/Sequences/Seq_Intro" } }

`editor.sequencer.findBinding`

Finds a binding by display name (case-insensitive search).

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`name`	string	Yes	Display name to search for

Returns:

Name	Type	Description
`binding_id`	string	Binding GUID
`display_name`	string	Display name
`binding_type`	string	"spawnable" or "possessable"
`track_count`	number	Number of tracks

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.findBinding", "params": { "asset_path": "/Game/Sequences/Seq_Intro", "name": "Cube" } }

`editor.sequencer.addTrack`

Adds a track of the specified class to a binding.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_class`	string	Yes	Track class name (e.g. "MovieScene3DTransformTrack")

Returns:

Name	Type	Description
`success`	bool	Whether track was added
`track_index`	number	Track index within the binding
`track_class`	string	Track class name
`display_name`	string	Track display name
`section_count`	number	Number of sections

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addTrack",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "binding_id": "A1B2C3...", "track_class": "MovieScene3DTransformTrack" }
}

`editor.sequencer.getTracks`

Returns all tracks for a specific binding.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID

Returns: Array of objects:

Name	Type	Description
`track_index`	number	Track index
`track_class`	string	Track class name
`display_name`	string	Track display name
`section_count`	number	Number of sections

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getTracks",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "binding_id": "A1B2C3..." }
}

`editor.sequencer.getMasterTracks`

Returns all master (top-level) tracks in a sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path

Returns: Array of objects: track_index (number), track_class (string), display_name (string), section_count (number).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getMasterTracks", "params": { "asset_path": "/Game/Sequences/Seq_Intro" } }

`editor.sequencer.removeTrack`

Removes a track at the specified index from a binding.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_index`	number	Yes	Index of track to remove

Returns: success (bool).

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.removeTrack",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "binding_id": "A1B2C3...", "track_index": 0 }
}

`editor.sequencer.addSection`

Adds a section to the specified track.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_index`	number	Yes	Track index

Returns:

Name	Type	Description
`success`	bool	Whether section was added
`section_index`	number	Section index
`section_path`	string	UObject path of the created section
`range_start`	number	Section start frame
`range_end`	number	Section end frame

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addSection",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "binding_id": "A1B2C3...", "track_index": 0 }
}

`editor.sequencer.setSubSequence`

Sets the sub-sequence reference on a UMovieSceneSubSection.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	Master LevelSequence asset path
`binding_id`	string	No	Binding GUID (omit for master-level tracks)
`track_index`	number	Yes	Track index (must be a Sub Track)
`section_index`	number	Yes	Section index within the track
`sub_sequence_path`	string	Yes	Asset path of the sub-sequence to reference

Returns: success (bool), sub_sequence_path (string), section_index (number).

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.setSubSequence",
  "params": { "asset_path": "/Game/Sequences/SEQ_Master", "track_index": 0, "section_index": 0, "sub_sequence_path": "/Game/Sequences/SEQ_Shot01" }
}

`editor.sequencer.setSectionRange`

Sets the frame range for a section.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_index`	number	Yes	Track index
`section_index`	number	Yes	Section index
`start_frame`	number	Yes	Start frame
`end_frame`	number	Yes	End frame

Returns: success (bool).

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.setSectionRange",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "binding_id": "A1B2C3...", "track_index": 0, "section_index": 0, "start_frame": 0, "end_frame": 120 }
}

`editor.sequencer.setPlaybackRange`

Sets the playback range for the entire sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`start_frame`	number	Yes	Start frame
`end_frame`	number	Yes	End frame

Returns: success (bool).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.setPlaybackRange", "params": { "asset_path": "/Game/Sequences/Seq_Intro", "start_frame": 0, "end_frame": 300 } }

`editor.sequencer.setDisplayRate`

Sets the display rate (frames per second) for the sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`fps`	number	Yes	Frames per second

Returns: success (bool), fps (number).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.setDisplayRate", "params": { "asset_path": "/Game/Sequences/Seq_Intro", "fps": 30 } }

`editor.sequencer.addFolder`

Adds a root folder to the sequence for organization.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`folder_name`	string	Yes	Name of the folder

Returns: success (bool), folder_name (string), child_folder_count (number), child_track_count (number).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addFolder", "params": { "asset_path": "/Game/Sequences/Seq_Intro", "folder_name": "Characters" } }

`editor.sequencer.getFolders`

Returns all root folders in a sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path

Returns: Array of objects: folder_name (string), child_folder_count (number), child_track_count (number), child_binding_count (number).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getFolders", "params": { "asset_path": "/Game/Sequences/Seq_Intro" } }

`editor.sequencer.setReadOnly`

Sets or clears the read-only flag on a sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`read_only`	bool	Yes	Whether sequence should be read-only

Returns: success (bool), read_only (bool).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.setReadOnly", "params": { "asset_path": "/Game/Sequences/Seq_Intro", "read_only": true } }

`editor.sequencer.getMarkedFrames`

Returns all marked frames (bookmarks) in a sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path

Returns: Array of objects: index (number), frame (number), label (string), color (optional {r, g, b, a}).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getMarkedFrames", "params": { "asset_path": "/Game/Sequences/Seq_Intro" } }

`editor.sequencer.addMarkedFrame`

Adds a marked frame (bookmark) at a specific frame number.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`frame`	number	Yes	Frame number to mark
`label`	string	Yes	Label for the marked frame
`color`	object	No	Optional {r, g, b, a} color (0.0-1.0)

Returns: success (bool), index (number).

Example Request:

{
  "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addMarkedFrame",
  "params": { "asset_path": "/Game/Sequences/Seq_Intro", "frame": 60, "label": "Action Start", "color": { "r": 1.0, "g": 0.0, "b": 0.0, "a": 1.0 } }
}

`editor.sequencer.setKey`

Sets a keyframe on a channel at a specific frame.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_index`	number	Yes	Track index
`channel_index`	number	No	Channel index within the track (default: 0)
`frame`	number	Yes	Frame number (display rate)
`value`	number	Yes	Value to set
`interpolation`	string	No	"linear", "cubic", or "constant" (default: "cubic")

Returns: success (bool), key_index (number), frame (number), value (number).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.setKey", "params": { "asset_path": "/Game/Sequences/SEQ_S01", "binding_id": "A1B2C3...", "track_index": 0, "channel_index": 0, "frame": 100, "value": 50.0, "interpolation": "cubic" } }

`editor.sequencer.getKeys`

Reads keyframes from a channel within an optional frame range.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_index`	number	Yes	Track index
`channel_index`	number	No	Channel index (default: 0)
`start_frame`	number	No	Start of frame range
`end_frame`	number	No	End of frame range

Returns: Array of objects: frame (number), value (number), interpolation (string).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getKeys", "params": { "asset_path": "/Game/Sequences/SEQ_S01", "binding_id": "A1B2C3...", "track_index": 0, "channel_index": 0 } }

`editor.sequencer.removeKey`

Removes a keyframe at a specific frame from a channel.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_index`	number	Yes	Track index
`channel_index`	number	No	Channel index (default: 0)
`frame`	number	Yes	Frame number to remove

Returns: success (bool), message (string, optional).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.removeKey", "params": { "asset_path": "/Game/Sequences/SEQ_S01", "binding_id": "A1B2C3...", "track_index": 0, "channel_index": 0, "frame": 100 } }

`editor.sequencer.getChannels`

Lists all channels on a track's first section, including name, type, and key count.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Binding GUID
`track_index`	number	Yes	Track index

Returns: Array of objects: index (number), name (string), type (string), key_count (number). For transform tracks this returns 9 channels: Location.X/Y/Z, Rotation.X/Y/Z, Scale.X/Y/Z.

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.getChannels", "params": { "asset_path": "/Game/Sequences/SEQ_S01", "binding_id": "A1B2C3...", "track_index": 0 } }

`editor.sequencer.addCameraCutTrack`

Creates a camera cut master track on the sequence.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path

Returns: success (bool), already_existed (bool).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addCameraCutTrack", "params": { "asset_path": "/Game/Sequences/SEQ_S01" } }

`editor.sequencer.addCameraCut`

Adds a camera switch at a specific frame on the camera cut track.

Parameters:

Name	Type	Required	Description
`asset_path`	string	Yes	LevelSequence asset path
`binding_id`	string	Yes	Camera binding GUID
`frame`	number	Yes	Frame for the camera switch

Returns: success (bool), frame (number), camera_binding (string).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.addCameraCut", "params": { "asset_path": "/Game/Sequences/SEQ_S01", "binding_id": "A1B2C3...", "frame": 120 } }

`editor.sequencer.playback`

Controls sequencer playback: play, stop, pause, or scrub to a frame.

Parameters:

Name	Type	Required	Description
`asset_path`	string	No	LevelSequence asset path
`action`	string	Yes	"play", "stop", "pause", or "scrub"
`frame`	number	No	Frame to scrub to (required for "scrub" action)

Returns: success (bool), action (string).

Example Request:

{ "jsonrpc": "2.0", "id": 1, "method": "editor.sequencer.playback", "params": { "action": "scrub", "frame": 60 } }