[Bug 792900] Update to ffmpeg 4.0 API

[GStreamer (GNOME Bugzilla)]

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

--- Comment #20 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Created attachment 373017
  --> https://bugzilla.gnome.org/attachment.cgi?id=373017&action=edit
Refactor avcfg / avvidenc

We were previously installing hardcoded properties for all
video encoders, refactor to instead use FFmpeg's AVOption API.

avvidenc still exposes a few properties related to the pass
mechanism: while the AVOption API allows specifying both passes
as flags at the same time, this is not practical in GStreamer's
context, where passes need to be run separately using a stats file.

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