[Bug 795424] qtdemux: Add MSE-style flush

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795424

--- Comment #11 from Alicia Boya García <aboya at igalia.com> ---
The only flush not propagated is the one resulting from skipping the mdat at
the beginning of the file (one after seeking after, then another one seeking
before once we parsed the headers).

This is the behavior qtdemux has before, so I'm playing safe by keeping it.

A possible motivation for it is to avoid downstream discard events resulting
from parsing the headers. Right out of my mind comes SEGMENT events, which are
emitted when the headers are parsed; but I'm not sure if elements actually
discard such data or if they are right to do so.

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