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Steps:

1. Configure daemon with --disable-video and build
2. Launch daemon so it can save your new preferences
3. Configure daemon with --enable-video and build
4. Launch daemon

Expected result: No crash, daemon runs just fine.

Actual result: Crash, because daemon can't load non-existing video preferences.

Workaround: Add the following to dring.yml (after audio section):

video:
  decodingAccelerated: false
  devices:
    - framerate: 30
      name: Blabla
      video_size: 1280x720
      channel: Camera 1

Device can be removed from dring.yml once daemon saves new configuration (launch and quit).