[Bug 792900] Update to ffmpeg 4.0 API

[GStreamer (GNOME Bugzilla)]

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

--- Comment #15 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Nice work, I've went over the code and it looks quite good. I'm currently
testing, here's couple of things I have found.

The number of "generic" and possible none working properties is huge, we should
try and reduce that.

Profiles/level is done in caps, should not be exposed in properties. It's also
weird to find profile on mjpeg encoder that says aac_main, aac_low, etc. Maybe
a bug ?

color-* + colorimetry should not be exposed as properties. Same for
field-order. 

I wasn't sure how well the generic option interface was, clearly it's not yet
as good as it should be, unless we have a bug in this branch, as so many
unrelated properties get added in elements.

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