Thanks for @BUnipendix

Usage

Clone this repository and PyCriUsm on your PC

git clone https://github.com/mqnowa/hoyo_usm_extractor
git clone https://github.com/BUnipendix/PyCriUsm

Preparing PyCriUsm

Build the decorder.

cd [...]/PyCriUsm

python setup.py build_ext --inplace

Rename decrypt.xxxxxxxxxxxxx.pyd to decrypt.pyd.

Move it to cri_usm_demuxer dir.

Preparing Hoyo USM Extractor (this repository)

cd [...]/hoyo_usm_extractor

Install ffmpeg and add path. (i.e. Enable to use ffmpeg command.)

Create your_pycriusm_path.txt and write PyCriUsm path.

Run main.py

main.py -i USM_PATH -o OUTPUT_DIR -ch 2

-i: usm file to input
-o: output dir
-ch: channel 0: cn, 1: en, 2: jp, 3: kr
-vc: ffmpeg video codec. (h264, hevc, ...) default, "copy"
-ac: ffmpeg audio codec. (aac, ...) default, "aac"