laga@wutbuch:~$ mythbackend --verbose help
Verbose debug levels.
Accepts any combination (separated by comma) of:

  all           - ALL available debug output
  important     - Errors or other very important messages
  general       - General info
  record        - Recording related messages
  playback      - Playback related messages
  channel       - Channel related messages
  osd           - On-Screen Display related messages
  file          - File and AutoExpire related messages
  schedule      - Scheduling related messages
  network       - Network protocol related messages
  commflag      - Commercial Flagging related messages
  audio         - Audio related messages
  libav         - Enables libav debugging
  jobqueue      - JobQueue related messages
  siparser      - Siparser related messages
  eit           - EIT related messages
  vbi           - VBI related messages
  database      - Display all SQL commands executed
  timestamp     - Conditional data driven messages
  none          - NO debug output

The default for this program appears to be: '-v important,general'

Most options are additive except for none, all, and important.
These three are semi-explicit and take precedence over any
prior options given.  You can however use something like
'-v none,jobqueue' to get only JobQueue related messages
and override the default verbosity level.

The additive options may also be subtracted from 'all' by
prefixing them with 'no', so you may use '-v all,nodatabase'
to view all but database debug messages.

Some debug levels may not apply to this program.

laga@wutbuch:~$