[Bug 755237] Caps Feature Negotiations have bad defaults

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755237

--- Comment #3 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
You are asking us to prevent having a valid case where memory should be NONE
(reducing what this can do).

The default here only exist for when you set no caps feature at all.

  mime/type,fields=...

This defaults to:
  mime/type(memory:SystemMemory),fields=...

There is no ambiguity when you do set a caps features.

  mime/type(meta:MyMeta),feilds=...

Should not in my opinion match:

  mime/type(memory:SystemMemory, meta:MyMeta),feilds=...

The first says, I want MyMeta and no memory shall be used (like a OMX tunnel),
the second says I want MyMeta with memory compatible with SystemMemory.

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