Run the following operations to change the undeground ore seed of a legacy planet named "MyInputPlanet.json":
Extract pipeline lz4
python extractpipeline.py MyInputPlanet.json pipeline.lz4
Decompress pipeline
lz4d pipeline.lz4 >pipeline.json
Change seed (use any value in place of 42, current value was likely 0)
python reseed.py pipeline.json pipeline42.json 42
Compress pipeline
lz4c <pipeline42.json >pipeline42.lz4
Inject pipeline in new planet json
python replacepipeline.py MyInputPlanet.json pipeline42.lz4 MyNewReseededPlanet.json