[Bug 792900] Update to ffmpeg 4.0 API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792900

--- Comment #13 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
I pushed a branch finalizing the port at
https://github.com/MathieuDuponchelle/gst-libav/ , it doesn't use any
deprecated API anymore.

The changes are significant, and not backward-compatible, I've run
gst-validate-launcher, no regressions :)

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