uloop-record-input

uloop record-input

Record keyboard and mouse input during PlayMode frame-by-frame into a JSON file. Captures key presses, mouse movement, clicks, and scroll events via Input System device state diffing.

Usage

# Start recording
uloop record-input --action Start

# Start recording with key filter
uloop record-input --action Start --keys "W,A,S,D,Space"

# Stop recording and save
uloop record-input --action Stop

# Stop and save to specific path
uloop record-input --action Stop --output-path scripts/my-play.json

Parameters

Parameter	Type	Default	Description
--action	enum	Start	Start - begin recording, Stop - stop and save
--output-path	string	auto	Save path. Auto-generates under .uloop/outputs/InputRecordings/
--keys	string	""	Comma-separated key filter. Empty = all common game keys

Deterministic Replay

Replay injects input frame-by-frame, so the game must also be deterministic to produce identical results. If the recording will be used for E2E tests, bug reproduction, or replay verification, read references/deterministic-replay.md before designing assertions or game logic.

Prerequisites

• Unity must be in PlayMode
• Input System package must be installed (com.unity.inputsystem)
• Use this only when the project already uses the New Input System.

Output

The CLI prints JSON with:

• Success: Whether the operation succeeded
• Message: Status message
• Action: Echoes which action was executed (Start or Stop)
• OutputPath: Path to saved recording (nullable; populated on Stop only)
• TotalFrames: Number of frames recorded (nullable int; populated on Stop only)
• DurationSeconds: Recording duration in seconds (nullable float; populated on Stop only)

The CLI output contains only these six payload fields. Internal metadata such as Ver is removed before printing. There is no RecordingId, StartTimestamp, KeysCaptured, or per-frame data in the response — frame data lives only in the JSON file at OutputPath.