videomixer alpha transparency does not work on NVIDIA Jetson

[rary]

Hi

Sorry for late reply.
I run following pipeline to see raw data has correct alpha value.
gst-launch-1.0 videotestsrc num-buffers=1 ! alpha method=green !
video/x-raw,format=RGBA ! filesink location=tmp.rgba

result for green regions was
On Linux laptop: RGBA(0, 0, 0, 0) as expected
On Jetson : RGBA(0, 0, 0, FE)

I tried method=blue and method=custom target-r=255 target-g=0 (red to
transparent) .
And it worked in both environment.

Maybe, there is some bug, I'll look into source code.



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