SFX Transient Onset Detector & Frame Snapper

Standard Pipeline Failure
Align by File Start (2.03s Delay)

Places file at video cut marker. Unmeasured 2.03s leading silence causes impact to land over 2 seconds late!

THIRI Measured Onset
Transient Peak Detection & Left Offset

Measures first true acoustic hit ($t = 2.03\text{s}$) and shifts start by $-2.03\text{s}$, locking strike to Frame 0.

TIMELINE: Video Cut Marker ($t = 1.00\text{s}$) vs SFX Acoustic Transient Strike SYNC DELTA: +2,030 ms (UNSYNCED)
Measured Leading Dead Air: 2.03s Silence duration before generative model fires first transient
Video Impact Cue Marker: 1.00s Exact video frame timestamp where visual action hits
Transient Snapping Grid: Placement precision for cinematic hit sync
Video Hit Offset +2,030 ms
Frame Alignment 48.7 FRAMES OFF
Transient Energy -0.1 dBFS
Sync Status FAIL
👤 Non-Tech / Creator Experience Visual-Audio Reflex Test
The "Bad Kung-Fu Dub" Clapperboard Test

Everyday Analogy: When an AI generates a sound effect, it often leaves 2 seconds of invisible silence at the beginning of the file. Dropping that file onto a video cut is like watching a movie punch land in total silence, and hearing the "BAM!" two seconds later. Click below to watch the visual flash and feel the delay vs THIRI frame-lock.

🎬 READY: Click to fire the visual flash at t = 1.00s
Watch the box flash white and listen for when the impact sound arrives.
💻 Developer / Live Onset Engine
RMS Derivative Onset + FFmpeg Offset

Live Python/FFmpeg transient peak alignment math computed from your sliders: