[Bug 769962] New: videocompositor: Remove output format alpha check

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769962

            Bug ID: 769962
           Summary: videocompositor: Remove output format alpha check
    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: kevinbing.song at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Why need below code to check output format alpha? Our hardware support
transform such as RGBA to YUYV. But video compositor will report error.

      if (at_least_one_alpha && !(finfo->flags & GST_VIDEO_FORMAT_FLAG_ALPHA))
{
        GST_ELEMENT_ERROR (vagg, CORE, NEGOTIATION,
            ("At least one of the input pads contains alpha, but configured
caps don't support alpha."),
            ("Either convert your inputs to not contain alpha or add a
videoconvert after the aggregator"));
        ret = FALSE;
        goto done;
      }

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