World IPv6 day was a non-event, establishing that those options are
useless, and so should they.

Reorder functions to avoid forward declarations.

Reorder functions to avoid forward declarations.

It isn't use anywhere else.

This avoids racing with the audio output thread (if it exists) on the
end date of the mixer input FIFO.

This avoids racing with decoder thread (audio input & mixer) w.r.t. the
FIFO timestamps.

Reported-By: Alessandro (ale5000)

Reported-By: Alessandro (ale5000)

- by default, fullscreen is performed on the same monitor as the one
  where the video is currently being played back.
- support for --qt-fullscreen-screennumber if the user wishes to force
  fullscreen on a given monitor.

This fixes trac #4712. Tested on Linux. Tests needed for Windows.

The audio input drops expired packets before they hit the mixer. Since
we only support a single input per mixer, the mixer check is mostly
redumdant.

Pointed-out-by: Fabian Greffrath <fabian@greffrath.com> (Debian BTS)