Repository Analysis

Nevcairiel/LAVFilters

LAV Filters - Open-Source DirectShow Media Splitter and Decoders

3.0 Likely human-written View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of Nevcairiel/LAVFilters, a C++ project with 9,020 GitHub stars. SynthScan v2.0 examined 190,553 lines of code across 625 source files, recording 558 pattern matches distributed across 3 syntactic categories. The overall adjusted score of 3.0 places this repository in the Likely human-written band.

The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).

3.0
Adjusted Score
3.0
Raw Score
100%
Time Factor
2026-07-08
Last Push
9.0K
Stars
C++
Language
190.6K
Lines of Code
625
Files
558
Pattern Hits
2026-07-14
Scan Date
0.00
HC Hit Rate

What These Metrics Mean

Adjusted Score
Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score
The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor
The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits
Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate
High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files
Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

Longitudinal tracking requires multiple scan runs. Once this repository is re-scanned after new commits land, this chart will visualise how the synthetic code signal evolves over time — enabling you to detect whether AI authorship is growing, stabilising, or being actively corrected by human engineers.

No multi-scan history yet — run the scanner again to build trend data.

Severity Breakdown

Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.

CRITICAL 0HIGH 0MEDIUM 2LOW 556

Directory Score Breakdown

This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.

Pattern Findings

The scanner identified 558 distinct pattern matches across 3 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.

Over-Commented Block552 hits · 552 pts
SeverityFileLineSnippetContext
LOWinclude/LAVSplitterSettings.h41 //COMMENT
LOWinclude/LAVSplitterSettings.h61 // Set the preferred subtitle languages as ISO 639-2 language codes, comma separatedCOMMENT
LOWinclude/IKeyFrameInfo.h21#pragma onceCOMMENT
LOWinclude/LAVAudioSettings.h101{COMMENT
LOWinclude/ID3DVideoMemoryConfiguration.h1// -----------------------------------------------------------------COMMENT
LOWinclude/ID3DVideoMemoryConfiguration.h21{COMMENT
LOWinclude/ID3DVideoMemoryConfiguration.h41//COMMENT
LOWinclude/IStreamSourceControl.h21COMMENT
LOWinclude/IStreamSourceControl.h41 // Position is in DirectShow reference time, 100ns units.COMMENT
LOWinclude/LAVVideoSettings.h221 //COMMENT
LOWinclude/LAVVideoSettings.h241 STDMETHOD_(DWORD, GetNumThreads)() = 0;COMMENT
LOWinclude/IMediaSideData.h1// -----------------------------------------------------------------COMMENT
LOWinclude/IGraphRebuildDelegate.h21COMMENT
LOWinclude/IPinSegmentEx.h1#pragma onceCOMMENT
LOWdecoder/LAVAudio/BitstreamMAT.cpp21COMMENT
LOWdecoder/LAVAudio/LAVAudio.h21COMMENT
LOWdecoder/LAVAudio/LAVAudio.h41#define PCM_BUFFER_MIN_DURATION 60000COMMENT
LOWdecoder/LAVAudio/stdafx.h21COMMENT
LOWdecoder/LAVAudio/stdafx.h41{COMMENT
LOWdecoder/LAVAudio/dllmain.cpp21// --------------------------------------------------------------------------------COMMENT
LOWdecoder/LAVAudio/PostProcessor.cpp121 case SampleFormat_FP32: memset(pBuffer, 0, get_byte_per_sample(sfSampleFormat)); break;COMMENT
LOWdecoder/LAVAudio/PostProcessor.cpp141// Note that when copying one source channel into multiple destinations, you always want to reduce its volume.COMMENT
LOWdecoder/LAVAudio/resource.h1//{{NO_DEPENDENCIES}}COMMENT
LOWdecoder/LAVAudio/resource.h21#define IDC_VOLUME 1039COMMENT
LOWdecoder/LAVAudio/resource.h41#define IDC_BITSTREAMING 1061COMMENT
LOWdecoder/LAVAudio/resource.h61#define IDC_LBL_OUTPUT_CHANNEL 1081COMMENT
LOWdecoder/LAVAudio/resource.h81#define IDC_DELAY 1101COMMENT
LOWdecoder/LAVAudio/resource.h101#define IDC_LBL_CENTER_LEVEL 1124COMMENT
LOWdecoder/LAVAudio/resource.h121#endifCOMMENT
LOWdecoder/LAVAudio/LAVAudio.cpp21#include "LAVAudio.h"COMMENT
LOWdecoder/LAVAudio/LAVAudio.cpp41#pragma warning(disable : 4101)COMMENT
LOWdecoder/LAVAudio/parser/dts.cpp21COMMENT
LOWdecoder/LAVVideo/stdafx.h21COMMENT
LOWdecoder/LAVVideo/stdafx.h41COMMENT
LOWdecoder/LAVVideo/stdafx.h61#include "DShowUtil.h"COMMENT
LOWdecoder/LAVVideo/dllmain.cpp21// --------------------------------------------------------------------------------COMMENT
LOWdecoder/LAVVideo/resource.h1//{{NO_DEPENDENCIES}}COMMENT
LOWdecoder/LAVVideo/resource.h21#define IDC_THREADS 1005COMMENT
LOWdecoder/LAVVideo/resource.h41#define IDC_OUT_10BIT 1026COMMENT
LOWdecoder/LAVVideo/resource.h61#define IDC_DEINT_FIELDORDER 1050COMMENT
LOWdecoder/LAVVideo/resource.h81#define IDC_GROUP_HWDEINT 1072COMMENT
LOWdecoder/LAVVideo/resource.h101// COMMENT
LOWdecoder/LAVVideo/LAVPixFmtConverter.cpp61 LAVOutPixFmts lav_pix_fmts[LAVOutPixFmt_NB + 1];COMMENT
LOWdecoder/LAVVideo/LAVVideo.h21COMMENT
LOWdecoder/LAVVideo/LAVVideo.cpp21#include "LAVVideo.h"COMMENT
LOWdecoder/LAVVideo/pixconv/pixconv_sse2_templates.h21COMMENT
LOWdecoder/LAVVideo/pixconv/pixconv_sse2_templates.h41COMMENT
LOWdecoder/LAVVideo/pixconv/pixconv_sse2_templates.h61// dreg - register with dithering coefficientsCOMMENT
LOWdecoder/LAVVideo/pixconv/pixconv_sse2_templates.h81// dreg - register with dithering coefficientsCOMMENT
LOWdecoder/LAVVideo/pixconv/pixconv_sse2_templates.h101#define PIXCONV_STREAM_LOAD(reg, src) reg = _mm_stream_load_si128((__m128i *)(src)); /* load (streaming) */COMMENT
LOWdecoder/LAVVideo/decoders/msdk_mvc.h21#include "DecBase.h"COMMENT
LOWdecoder/LAVVideo/decoders/avcodec.cpp21#include "avcodec.h"COMMENT
LOWdecoder/LAVVideo/decoders/cuvid.h21#include "DecBase.h"COMMENT
LOWdecoder/LAVVideo/decoders/dxva2dec.cpp21COMMENT
LOWdecoder/LAVVideo/decoders/quicksync.cpp21#include "quicksync.h"COMMENT
LOWdecoder/LAVVideo/decoders/mvc/include/mfxdefs.h41COMMENT
LOWdecoder/LAVVideo/decoders/cuvid/dynlink_cuda_d3d.h81#pragma warning( disable : 4996 ) // disable deprecated warning COMMENT
LOWdecoder/LAVVideo/decoders/cuvid/dynlink_nvcuvid.h381COMMENT
LOWdecoder/LAVVideo/decoders/cuvid/dynlink_nvcuvid.h421//! cudaVideoState_Started - to signal the source to run and deliver dataCOMMENT
LOWdecoder/LAVVideo/decoders/cuvid/dynlink_nvcuvid.h521//! \fn CUresult CUDAAPI cuvidCreateVideoParser(CUvideoparser *pObj, CUVIDPARSERPARAMS *pParams)COMMENT
492 more matches not shown…
AI Slop Vocabulary2 hits · 6 pts
SeverityFileLineSnippetContext
MEDIUMdecoder/LAVVideo/decoders/d3d11va.cpp674 // Native decoding should use 16 buffers to enable seamless codec changesCOMMENT
MEDIUMdecoder/LAVVideo/decoders/dxva2dec.cpp1030 // Native decoding should use 16 buffers to enable seamless codec changesCOMMENT
Slop Phrases4 hits · 6 pts
SeverityFileLineSnippetContext
LOWthirdparty/32/include/nettle/dsa-compat.h102 * When done with the key and signature, don't forget to callCOMMENT
LOWthirdparty/32/include/nettle/rsa.h173 * When done with the key and signature, don't forget to callCOMMENT
LOWthirdparty/64/include/nettle/dsa-compat.h102 * When done with the key and signature, don't forget to callCOMMENT
LOWthirdparty/64/include/nettle/rsa.h173 * When done with the key and signature, don't forget to callCOMMENT