[Bug 797142] caps: Using gst_caps_fixate() on src pad leads to lies in the caps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797142

--- Comment #3 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
(In reply to Sebastian Dröge (slomo) from comment #2)
> The real problem here is that the source is not providing complete caps, or
> more general that we don't have a way to declare mandatory and optional
> fields in the caps.

That I believe is the design error, which I cannot fix. But I can improve
things. If sources drops the field that aren't supported, you'll get only the
media type when negotiating with ANY. The source would drop the field at
fixating time. Just the media type should make is_subset() fail.

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