[Bug 792900] Update to ffmpeg 4.0 API

[GStreamer (GNOME Bugzilla)]

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

--- Comment #45 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Created attachment 373042
  --> https://bugzilla.gnome.org/attachment.cgi?id=373042&action=edit
Update ffmpeg version requirements

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