Corpus Replicator

Corpus Replicator is a corpus generation tool that enables the creation of multiple unique output files based on templates. The primary intended use case is the creation of a seed corpus that can be used by fuzzers. Support for additional output formats can be added via the creation of Recipes. If a desired format is unsupported, support can be added via the creation of a CorpusGenerator.

The goal is to create an efficient corpus that maximizes code coverage and minimizes file size. Small unique files that execute quickly are preferred.

Currently four media types can be generated animation, audio, image and video.

Requirements

Corpus Replicator relies on FFmpeg.

Installation

pip install corpus-replicator

Example

This is an example recipe file.

# "base" contains required entries and default flags
base:
  codec: "h264"       # name of the codec
  container: "mp4"    # container/file extension
  library: "libx264"  # name of library
  medium: "video"     # supported medium
  tool: "ffmpeg"      # name of supported tool
  default_flags:
    encoder:          # "encoder" flag group
      ["-c:v", "libx264"]
    resolution:       # "resolution" flag group
      ["-s", "320x240"]

# variations allow flags to be added and overwritten
# one file will be generated for each entry in a flag group
variation:
  resolution:         # flag group - overwrites default flag group in "base"
  - ["-s", "640x480"]
  - ["-s", "32x18"]
  - ["-s", "64x64"]
  monochrome:         # flag group - adds new flag group
  - ["-vf", "hue=s=0"]

Running the recipe will generate a corpus:

$ corpus-replicator example.yml video -t test
Generating templates...
1 recipe(s) will be used with 1 template(s) to create 4 file(s).
Generating 4 'video/libx264/h264/mp4' file(s) using template 'test'...
Optimizing corpus, checking for duplicates...
Done.

Resulting corpus:

$ ls generated-corpus/
video-h264-libx264-test-monochrome-00.mp4
video-h264-libx264-test-resolution-01.mp4
video-h264-libx264-test-resolution-00.mp4
video-h264-libx264-test-resolution-02.mp4

A more complex corpus can be generated by using multiple Recipes and Templates at once.

Recipes are stored in src/corpus_replicator/recipes.