tracks aren't init yet, so we can't compute duration
when falling back from missing mehd

Could have been at least some leaks, and some nasty things
due to smooth box handling.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

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

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

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

The issue is twofold:
- converting filenames that are already UTF8 encoded from the Qt dialog box
- missing UTF8-to-locale conversion for filename passed as parameter to vlc

These bugs accounted for skins with name or path containing multibyte
characters not being able to load successfully on Windows.

This fixes trac #14843

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.