capric98 / PyCriUsm

a python script to decrypt and demux Honkai: Star Rail cutscene video

PyCriUsm

a python library to decrypt and demux HSR cutscene video. In theory, it can demux any of the encrypted Usm file. But I only adapted to HSR..

The decryption module was written in cython so that we can achieve a speed 5 to 7 times faster than WannaCRI and nearly as fast as GI-Cutscene.

Refer to WannaCRI and GI-Cutscene

Build Cython code

Enter the repository and run this command

python setup.py build_ext --inplace

Move decrypt.xxx.[so|pyd] fils to cri_usm_demuxer folder

Example

def extract_video(video_path, output_dir):
    a = UsmDemuxer(video_path)
    video_name, audio_names = a.export(output_dir)
    return video_name, audio_names

Roadmap

• USM decryption support
• HCA decryption support(Used by GI)
• More flexable and powerful option to control usm chunks