[Bug 772584] pbutils/h265: add support for the "format range extensions profiles" values

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772584

Matthew Waters (ystreet00) <ystreet00 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ystreet00 at gmail.com
          Component|gst-plugins-bad             |gst-plugins-base
            Summary|x265 fails when trying to   |pbutils/h265: add support
                   |encode Y444                 |for the "format range
                   |                            |extensions profiles" values

--- Comment #1 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
So, the problem here is that pbutils only knows how to handle profile_idc
between 1 and 3 inclusive where x265 outputs a profile_idc of 4 corresponding
to the, "A.3.5 Format range extensions profiles" in the H.265 spec.  Now, x265
calls this one "Rext" (from
https://github.com/videolan/x265/blob/master/source/encoder/level.cpp#L219) and
chooses the exact configuration based on other conditions.

Adding a profile_idc == 4 check makes the pipeline above succeed.

The question now is what to do about detecting these profiles.  Split them
properly or just lump them all in together with a 'Rext' profile like x265.

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