Since we have no real way to drain stream demux fifo,
we should have a way to reset demuxer before switching to
a new segment.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

libvlc: expand media player API to retrieve full information about available chapter of a given title

libvlc: expand media player API to retrieve information about all available titles of the currently playing media item

This can happen when seeking via http.

This is interlocked with the control queue as it most probably should.