[Bug 639994] videomixer2: added 'transparent' background option

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=639994
  GStreamer | gst-plugins-good | git

Sebastian Dröge <slomo> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |0.10.29

--- Comment #3 from Sebastian Dröge <slomo at circular-chaos.org> 2011-04-01 09:36:01 UTC ---
commit ef5ac986f1b17a76fc283337a4a27b797e78e3e6
Author: Lane Brooks <dirjud at gmail.com>
Date:   Wed Jan 19 18:06:45 2011 -0700

    videomixer: Add transparent background option for alpha channel formats

commit 69b5aedc5878fb399e4ac10c743a64c142b238f6
Author: Lane Brooks <dirjud at gmail.com>
Date:   Wed Jan 19 12:07:17 2011 -0700

    videomixer2: Add transparent background option for alpha channel formats

    This option allows the videomixer2 element to output a valid alpha
    channel when the inputs contain a valid alpha channel. This allows
    mixing to occur in multiple stages serially.

    The following pipeline shows an example of such a pipeline:

    gst-launch videotestsrc background-color=0x000000 pattern=ball !
video/x-raw

    The first videotestsrc in this pipeline creates a moving ball on a
    transparent background. It is then passed to the first videomixer2.
    Previously, this videomixer2 would have forced the alpha channel to
    1.0 and given a background of checker, black, or white to the

    stream. With this patch, however, you can now specify the background
    as transparent, and the alpha channel of the input will be
    preserved. This allows for further mixing downstream, as is shown in
    the above pipeline where the a second videomixer2 is used to mix in a
    background of an smpte videotestsrc. So the result is a ball hovering
    over the smpte test source. This could, of course, have been
    accomplished with a single mixer element, but staged mixing is useful
    when it is not convenient to mix all video at once (e.g. a pipeline
    where a foreground and background bin exist and are mixed at the final
    output, but the foreground bin needs an internal mixer to create
    transitions between clips).

    Fixes bug #639994.

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