$ autosub -h
usage: autosub [-h] [-C CONCURRENCY] [-o OUTPUT] [-F FORMAT] [-S SRC_LANGUAGE]
               [-D DST_LANGUAGE] [-K API_KEY] [--list-formats]
               [--list-languages]
               [source_path]

positional arguments:
  source_path           Path to the video or audio file to subtitle

optional arguments:
  -h, --help            show this help message and exit
  -C CONCURRENCY, --concurrency CONCURRENCY
                        Number of concurrent API requests to make
  -o OUTPUT, --output OUTPUT
                        Output path for subtitles (by default, subtitles are
                        saved in the same directory and name as the source
                        path)
  -F FORMAT, --format FORMAT
                        Destination subtitle format
  -S SRC_LANGUAGE, --src-language SRC_LANGUAGE
                        Language spoken in source file
  -D DST_LANGUAGE, --dst-language DST_LANGUAGE
                        Desired language for the subtitles
  -K API_KEY, --api-key API_KEY
                        The Google Translate API key to be used. (Required for
                        subtitle translation)
  --list-formats        List all available subtitle formats
  --list-languages      List all available source/destination languages