Repository Analysis

xufuji456/FFmpegAndroid

FFmpeg实现视频裁剪、水印、转码、编解码、转Gif动图;FFmpeg本地推流、H264与RTMP实时推流直播;OpenGL滤镜特效,视频拍摄。音视频学习路线,音视频知识总结、流媒体协议

2.4 Likely human-written View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of xufuji456/FFmpegAndroid, a C project with 5,815 GitHub stars. SynthScan v2.0 examined 101,842 lines of code across 437 source files, recording 238 pattern matches distributed across 4 syntactic categories. The overall adjusted score of 2.4 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).

2.4
Adjusted Score
2.4
Raw Score
100%
Time Factor
2026-07-13
Last Push
5.8K
Stars
C
Language
101.8K
Lines of Code
437
Files
238
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 2MEDIUM 0LOW 236

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 238 distinct pattern matches across 4 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 Block234 hits · 225 pts
SeverityFileLineSnippetContext
LOW…in/java/com/frank/ffmpeg/util/MediaFormatIdentify.java161 // m4a: ftypM4A(66747970 4D3441)COMMENT
LOW…c/main/java/com/frank/ffmpeg/gif/BeautyGifEncoder.java961COMMENT
LOW…c/main/java/com/frank/ffmpeg/gif/BeautyGifEncoder.java1001 // algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-primeCOMMENT
LOW…c/main/java/com/frank/ffmpeg/gif/BeautyGifEncoder.java1021 // code: A n_bits-bit integer. If == -1, then EOF. This assumesCOMMENT
LOWapp/src/main/cpp/ff_audio_player.h1//COMMENT
LOWapp/src/main/cpp/media_transcode.cpp1//COMMENT
LOWapp/src/main/cpp/video_filter.c1//COMMENT
LOWapp/src/main/cpp/ffmpeg/cmdutils.h21COMMENT
LOWapp/src/main/cpp/ffmpeg/cmdutils.h161#define OPT_SUBTITLE 0x0200COMMENT
LOWapp/src/main/cpp/ffmpeg/opt_common.c21#include "config.h"COMMENT
LOWapp/src/main/cpp/ffmpeg/opt_common.c41#include "libavutil/version.h"COMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg_opt.c21#include "config.h"COMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg_opt.c41COMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg.h21COMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg.h41#include "libavutil/dict.h"COMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg_demux.c21COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h1/* Automatically generated by configure - do not modify! */COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h21#elseCOMMENT
LOWapp/src/main/cpp/ffmpeg/config.h41#define ARCH_S390 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h61#define HAVE_LDBRX 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h81#define HAVE_SSE42 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h101#define HAVE_ARMV6_EXTERNAL 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h121#define HAVE_AVX512ICL_EXTERNAL 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h141#define HAVE_MIPSDSP_EXTERNAL 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h161#define HAVE_PPC4XX_INLINE 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h181#define HAVE_XOP_INLINE 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h201#define HAVE_FAST_CMOV 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h221#define HAVE_CDIO_PARANOIA_H 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h241#define HAVE_MALLOC_H 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h261#define HAVE_CBRT 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h281#define HAVE_POWF 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h301#define HAVE_FCNTL 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h321#define HAVE_LOCALTIME_R 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h341#define HAVE_SETRLIMIT 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h361#define HAVE_AS_OBJECT_ARCH 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h381#define HAVE_KCMVIDEOCODECTYPE_HEVC 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h401#define HAVE_STRUCT_IP_MREQ_SOURCE 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h421#define HAVE_OPENCL_VAAPI_INTEL_MEDIA 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h441#define CONFIG_ENCODE_VIDEO_EXAMPLE 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h461#define CONFIG_LIBVIDSTAB 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h481#define CONFIG_GNUTLS 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h501#define CONFIG_LIBGSM 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h521#define CONFIG_LIBRIST 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h541#define CONFIG_LIBVPX 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h561#define CONFIG_LIBXCB_SHM 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h581#define CONFIG_AMF 0COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h601#define CONFIG_RUNTIME_CPUDETECT 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h621#define CONFIG_DCT 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h641#define CONFIG_PTX_COMPRESSION 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h661#define CONFIG_AUDIODSP 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h681#define CONFIG_FMTCONVERT 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h701#define CONFIG_INFLATE_WRAPPER 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h721#define CONFIG_MPEGVIDEOENC 1COMMENT
LOWapp/src/main/cpp/ffmpeg/config.h741#define CONFIG_STARTCODE 1COMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg_mux.h21#ifndef FFTOOLS_FFMPEG_MUX_HCOMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg_mux_init.c21#include <string.h>COMMENT
LOWapp/src/main/cpp/ffmpeg/ffmpeg_filter.c21#include <stdint.h>COMMENT
LOWapp/src/main/cpp/ffmpeg/ffprobe.c21/**COMMENT
LOWapp/src/main/cpp/ffmpeg/ffprobe.c41#include "libavutil/display.h"COMMENT
LOWapp/src/main/cpp/ffmpeg/ffprobe.c61#include "libavfilter/version.h"COMMENT
174 more matches not shown…
Synthetic Comment Markers2 hits · 15 pts
SeverityFileLineSnippetContext
HIGHextra/ffmpeg/include/libavformat/avformat.h1245#define AVFMT_FLAG_AUTO_BSF 0x200000 ///< Add bitstream filters as requested by the muxerCOMMENT
HIGHextra/ffmpeg/include/libavformat/avformat.h1245#define AVFMT_FLAG_AUTO_BSF 0x200000 ///< Add bitstream filters as requested by the muxerCOMMENT
AI Slop Vocabulary1 hit · 2 pts
SeverityFileLineSnippetContext
LOWextra/ffmpeg/include/libavformat/avformat.h1229#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in theCOMMENT
Hyper-Verbose Identifiers1 hit · 1 pts
SeverityFileLineSnippetContext
LOWshell/ios/build-ffmpeg-framework.sh98function CreateModulemapAndUmbrellaHeader() {CODE