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alpha: Fix sample pipeline

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Use the zorder pad property to make sure the semitransparent
video is on top of the background.

https://bugzilla.gnome.org/show_bug.cgi?id=762809
This commit is contained in:
Petr Viktorin 2016-02-28 10:12:36 +01:00 committed by Nicolas Dufresne
parent a4d64b5caa
commit d089cd5a12
1 changed files with 6 additions and 5 deletions
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11
gst/alpha/gstalpha.c
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@ -30,12 +30,13 @@
*
* Sample pipeline:
* |[
* gst-launch-1.0 videotestsrc pattern=smpte75 ! alpha method=green ! \
* videomixer name=mixer ! videoconvert ! autovideosink \
* videotestsrc pattern=snow ! mixer.
* gst-launch-1.0 videotestsrc pattern=snow ! mixer.sink_0 \
* videotestsrc pattern=smpte75 ! alpha method=green ! mixer.sink_1 \
* videomixer name=mixer sink_0::zorder=0 sink_1::zorder=1 ! \
* videoconvert ! autovideosink
* ]| This pipeline adds a alpha channel to the SMPTE color bars
* with green as the transparent color and mixes the output with
* a snow video stream.
* with green as the transparent color and overlays the output on
* top of a snow video stream.
*/