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typed-ffmpeg Development Guide

Code Generation

Several files in packages/v5–v8 are auto-generated by the codegen system. Do not edit them directly — edit the templates instead.

Auto-generated files (do NOT edit in packages/v*)

Any file carrying the header # NOTE: this file is auto-generated, do not modify is generated from a template. The generated files live under packages/v*/src/ffmpeg/ and their templates live under src/scripts/code_gen/templates/ with the same relative path and a .jinja extension.

Workflow for changing auto-generated files

  1. Edit the template in src/scripts/code_gen/templates/
  2. Run codegen to regenerate all versions: 
    source .venv/bin/activate
export PYTHONPATH="$PWD/src:$PYTHONPATH"
python -m scripts.code_gen.cli generate --outpath packages/v8/src/ffmpeg --ffmpeg-binary $(which ffmpeg) --rebuild
# repeat for v5, v6, v7
  3. Update snapshots if the template change affects test_render: 
    pytest src/scripts/code_gen/tests/test_gen.py::test_render --snapshot-update
  4. Commit both the template change and the regenerated package files together.