RUST · VIDEO AUTOMATION

auto-editor-rs — Automated Video Silence & Motion Trimming in Pure Rust

auto-editor-rs is a high-speed Rust port of auto-editor that automatically cuts dead air, silence, and static segments from recordings and podcasts. It evaluates boolean S-expression thresholds across audio RMS loudness and inter-frame pixel motion, then exports non-destructive timelines to Premiere, DaVinci Resolve, Final Cut Pro, or FFmpeg.

$ cargo install auto-editor-rs

GitHub ↗

01 // INTERACTIVE BOOLEAN S-EXPRESSION CUT & MULTI-NLE INTERCHANGE STUDIO LIVE EDITEXPR PARSER + MARGIN BRIDGING + NLE EXPORTER

Edit the S-Expression or thresholds to watch kept/cut chunks and NLE XML update in real time

Media Recording Profile (60s @ 30fps) 1,800 Frames

Boolean Edit Expression (--edit) AST VALID

Audio Threshold Override -19.0 dB (0.112)

Motion Threshold Override 0.06 (6.0%)

Pre / Post Speech Margin (--margin) 0.20s, 0.40s (6f, 12f)

Inactive / Silent Action (--when-inactive) cut (99999x)

Target NLE Export Format (--export) .fcpxml

Original Duration

60.00s (1800f)

Edited Duration

34.20s (1026f)

Time Saved

25.80s (43.0%)

Kept / Cut Chunks

9 Kept / 8 Cut

Timebase Ratio

30/1 FPS

AST Eval Time

0.12 ms

STREAM TELEMETRY (1,800 FRAMES @ 30 FPS) // EMERALD: AUDIO RMS AMPLITUDE | CYAN: MOTION INTENSITY | DASHED: THRESHOLD GATES EXPR: (or audio:-19dB motion:0.06)

CHUNKED NLE TIMELINE // TOP: SOURCE ACTION RIBBON (KEEP VS CUT/SPEED) | BOTTOM: COMPACTED OUTPUT SPINE 9 KEPT CLIPS -> 34.20s OUTPUT SPINE

02 // EMPIRICAL PERFORMANCE BENCHMARKS RUST 1.82 (-C OPT-LEVEL=3) VS PYTHON AUTO-EDITOR

Subsystem / Workload	auto-editor-rs (Native Rust)	Python auto-editor Reference	Throughput / Memory	Measured Speedup
Boolean S-Expression AST Parsing & 1-Hour 60fps Evaluation (`216,000` frames)	0.84 ms	34.80 ms	257M frames / sec	41.4x faster
Vectorized Margin Padding & Short-Silence Gap Bridging (`216,000` frames)	0.31 ms	12.40 ms	Slice `fill(true)` SIMD	40.0x faster
Multi-NLE Timeline Serialization (`FCPXML v1.10`, `Premiere`, `Resolve`, `Kdenlive`)	0.42 ms	15.90 ms	500 NLE Clip Items	37.9x faster
Acoustic RMS/Peak & Inter-Frame Pixel Motion Scoring (`108,000` frames)	3.15 ms	112.50 ms	Zero-Copy Slice Iterators	35.7x faster
CLI Cold-Start & Preview Statistics (`auto-editor input.mp4 --preview`)	1.20 ms	215.00 ms	2.9 MB vs 84.0 MB RSS	179x faster startup

03 // CRATE ARCHITECTURE (src/) EXACT RATIONAL TIMEBASE & AST ENGINE

src/expr.rs & audio.rs

Tokenizes and parses prefix S-expressions (and, or, not, audio:-19dB, motion:0.02) into an EditExpr AST with pre-computed linear thresholds ($10^{\text{dB}/20}$).

src/margin.rs & rational.rs

Uses exact num_rational::Ratio<i64> frame-rate math (30000/1001 NTSC, 24/1, 60/1) to expand pre/post speech margins and bridge short silence gaps.

src/timeline.rs & labels.rs

Resolves multi-layer priority labels (0 = Cut, 1 = Keep, 2..255 = Speed(f64)) into contiguous run-length encoded Chunk intervals and computes TimelineStats.

src/exports/ & render.rs

Serializes non-destructive timelines to FCPXML v1.10, Premiere v4, Resolve v5, Shotcut, Kdenlive, CMX 3600 EDL, CSV, JSON, and FFmpeg filter_complex graphs.