videomixer alpha transparency does not work on NVIDIA Jetson

[GStreamer-devel mailing list]

Hi All,

I'm trying following pipeline videomixer with 2 videotestsrc with alpha
channels.
This pipeline is from
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good/html/gst-plugins-good-plugins-alpha.html

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 ! video/x-raw,format=I420 ! xvimagesink

The pipeline works on my laptop linux machine.
However, does not work on Jetson TX2 and Xavier.

The main difference is cpu.
laptop is x86_64 but Jetson use arm cpu.

Anyone have information related to this?

Result picture:
laptop linux machine
https://imgur.com/a/ilxnvpg
Jetson TX2/Xavier
https://imgur.com/a/K2TqUEU

Thank you in advance.



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[MaZderMind]

Hi

you could test compositor, which is another implementation of the
videomixer interface. It would also be interesting to know if the
greenscreen-alpha is working of if it is already broken at that point.
ypu might want to use pngenc / multifilesink or similar to save the
resulting iamges to pngs, checking their alpha channel.

Peter


Am 14.02.19 um 06:14 schrieb rary via gstreamer-devel:

> Hi All,
>
> I'm trying following pipeline videomixer with 2 videotestsrc with alpha
> channels.
> This pipeline is from
> https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good/html/gst-plugins-good-plugins-alpha.html
>
> 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 ! video/x-raw,format=I420 ! xvimagesink
>
> The pipeline works on my laptop linux machine.
> However, does not work on Jetson TX2 and Xavier.
>
> The main difference is cpu.
> laptop is x86_64 but Jetson use arm cpu.
>
> Anyone have information related to this?
>
> Result picture:
> laptop linux machine
> https://imgur.com/a/ilxnvpg
> Jetson TX2/Xavier
> https://imgur.com/a/K2TqUEU
>
> Thank you in advance.
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>

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[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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