[Bug 781181] dashdemux: Use Date in http-header as UTC now

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781181

--- Comment #4 from Seungha Yang <sh.yang at lge.com> ---
(In reply to Sebastian Dröge (slomo) from comment #3)
> What does this solve, 

The difference between UTC now and availabilityStartTime is set as fragment
wating time.
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/ext/dash/gstdashdemux.c#n1926

The problem is, if UTCTiming element was not provided ans also system time is
much incorrect, we cannot start streaming.

> and isn't that exactly why the DASH extensions exist
> that allow you to specify the remote clock? (As NTP clock, HTTP HEAD request
> to somewhere, and 20 other ways)

clock source (NTP. HTTP HEAD or etc) related things are signalled by UTCTiming
element in MPD. But if UTCTiming element does not provided by server, HTTP
HEADER was one of the bast and simplest way to sync them from my experience.

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