[Bug 762809] New: alpha: Sample pipeline does not demonstrate functionality

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762809

            Bug ID: 762809
           Summary: alpha: Sample pipeline does not demonstrate
                    functionality
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: encukou at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The alpha filter's sample pipeline is:

gst-launch-1.0 videotestsrc pattern=smpte75 ! alpha method=green ! \
  videomixer name=mixer ! videoconvert ! autovideosink     \
  videotestsrc pattern=snow ! mixer.

Since the snow pattern (without alpha) comes second, it covers the frame and
the smpte75 pattern is not visible.
The two sources should be switched:

gst-launch-1.0 videotestsrc pattern=snow ! videomixer name=mixer ! \
  videoconvert ! autovideosink \
  videotestsrc pattern=smpte75 ! alpha method=green !  mixer.

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