[Bug 751475] New: encodebin: Expose more specific sink template caps.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751475

            Bug ID: 751475
           Summary: encodebin: Expose more specific sink template caps.
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mduponchelle1 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Having STATIC_CAPS_ANY on both templates led to issues
in gst-launch with such a profile:

application/ogg:video/x-theora:audio/x-vorbis

ie one audio and one video encoding profile, both with no
presence.

This led gst_element_request_compatible_pad (gst-utils.c)
to return either template, which was not necessarily compatible.

The reason for having STATIC_CAPS_ANY was to allow for
"avoid-reencoding", however there only is a small set of formats
that can be directly remuxed, we thus specify them all
in the video template caps.

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