[Bug 754465] compositor: Negotiation failure with ARGB64

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754465

--- Comment #2 from Thibault Saunier <tsaunier at gnome.org> ---
I just bisected it and the culpright is:

commit 1248b00c80aff2f24ce094a89ec58ce5c172afb8
Author: Mathieu Duponchelle <mathieu.duponchelle at opencreed.com>
Date:   Sat Jun 20 13:36:27 2015 +0200

    videoaggregator: simplifies and improves sink_get_caps.

    The problem here was that after removing the formats and
    all the things we could convert, we then intersected these
    caps with the template caps.

    Hence if a subclass offered permissive sink templates
    (eg all the possible formats videoconvert handles), but only
    one output format, then at negotiation time getcaps returned
    caps with the format restricted to that format, even though
    we do handle conversion.

    https://bugzilla.gnome.org/show_bug.cgi?id=751255

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