$ cat pass_signal
123451234512345123451234512345

$ signal-backup-decode --output-path out --password-file pass_signal signal-1970-01-01-01-00-00.backup
Database Version: ...
Copy successful, sqlite at signal-backup/out/signal_backup.db

$ ls -1 out
attachment/
avatar/
config/
stickers/
signal_backup.db

$ python3 signal_backup.py -h
usage: signal_backup.py [-h] [--db DB_PATH] [--attachment ATTACHMENT_DIR] [--conv_name CONV_NAME [CONV_NAME ...]] [--yourself YOUR_NAME]
                      [--output_dir HTML_OUTPUT_DIR]

optional arguments:
  -h, --help            show this help message and exit
  --db DB_PATH          Path to signal_backup.db file
  --attachment ATTACHMENT_DIR, -a ATTACHMENT_DIR
                        Path to attachment directory
  --conv_name CONV_NAME [CONV_NAME ...], -cn CONV_NAME [CONV_NAME ...]
                        Name of the conversation you wish to display
  --yourself YOUR_NAME, -y YOUR_NAME
                        Your name
  --output_dir HTML_OUTPUT_DIR, -o HTML_OUTPUT_DIR
                        html output dir

ipfyx@mysecretmachine:~/signal/signal-backup$ ls -1
bootstrap
CSS.py
example
--> out
README.md
signal_backup.py
signal.css
signal_structure.py

python3 signal_backup.py --db out/signal_backup.db --attachment out/attachment/ -cn 'Conversation Name 1' "Conversation Name 2" -y 'Your Name' --o output_directory 
Creating outpur directory backup_1970-01-01/Conversation Name 1/
Saving conversation Conversation Name 1
Copying attachment to backup_1970-01-01/Conversation Name 1/Conversation Name 1
# Sometimes files are deleted Failed fo move ./out/attachment//1618845228949_15172.docx because it does not exist
#TODO File not found. Unknown file type application/vnd.openxmlformats-officedocument.spreadsheetml.sheet for attachment 1618950490743_15207
3396 attachments successfuly copied
Conversation Conversation Name 1 successfuly saved
Creating outpur directory ...
Saving conversation ...
Copying attachment to ...
194 attachments successfuly copied
Conversation ... successfuly saved

ipfyx@mysecretmachine:~/signal/signal-backup$ ls -1
--> backup_1970-01-01
bootstrap
CSS.py
example
--> out
README.md
signal_backup.py
signal.css
signal_structure.py