[Bug 754465] New: [compositor] Negotiation failure whith ARGB64

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 754465
           Summary: [compositor] Negotiation failure whith ARGB64
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: tsaunier at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When launching a stream that uses ARGB64, compositor tries to work with it
though it does not support it.

The problem is that in acceptcaps, the compositor conciders it supports all
format (removing the format field from the template caps structure).

With the following pipeline:

  $ gst-launch-1.0 uridecodebin
uri=https://people.collabora.com/~tsaunier/samples/tmph72h4ynj.png !
imagefreeze ! compositor ! autovideosink

We end up having the following error on the bus:

  Setting pipeline to PAUSED ...
  Pipeline is PREROLLING ...
  ERROR: from element /GstPipeline:pipeline0/GstCompositor:compositor0: At
least one of the input pads contains alpha, but downstream can't support alpha.
  Additional debug info:
  gstvideoaggregator.c(559): gst_videoaggregator_update_converters ():
/GstPipeline:pipeline0/GstCompositor:compositor0:
  Either convert your inputs to not contain alpha or add a videoconvert after
the aggregator
  ERROR: pipeline doesn't want to preroll.
  Setting pipeline to NULL ...
  Freeing pipeline ...

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