VideoBox border-alpha

[Sebastian Dröge]

On Mi, 2013-12-18 at 15:07 -0800, fahad wrote:
> I have the following 1.0 pipeline on a windows box,
> 
> gst-launch-1.0 -v videomixer name=mix ! videoconvert ! autovideosink \
> videotestsrc pattern=0 ! video/x-raw, framerate=1/1, width=350, height=250 !
> \ 
> videoconvert !  videobox border-alpha=0 top=-200 left=-50 ! mix. \
> multifilesrc location="X:\\test.png" caps="image/png,framerate=1/1" ! pngdec
> ! videoconvert ! mix.
> 
> border-alpha=0 does not seem to do what it is suppose to? can any one tell
> if there is an issue with the border-alpha setting for video box.
> 
> No matter what i set the property to, (1/0) it always shows a solid
> background, i expect to see the background video coming through the border

As Adrian said, videomixer can do what videobox does already. Use the
offset properties on the videomixer pads for that.

Independent of that, in your above pipeline you need to make sure that
videobox gets a video format negotiated that includes an alpha channel,
e.g. RGBA. You can enforce this with a capsfilter between videoconvert
and videobox.

-- 
Sebastian Dröge, Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
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