Playbin + kmssink + aspect ratio black borders

[Daniel Rossi]

RPI3B. I forgot to include that in the subject. I'm trying to make test 
4:3 video sources but having a hard time not showing it fullscreen 
scaled.
kmssink force-modesetting=true
Causes frame dropping and these errors. Its using video4linux h264 
decoder though
WARNING: from element 
/GstPlayBin:playbin0/GstPlaySink:playsink/GstBin:vbin/GstKMSSink:kmssink0: 
A lot of buffers are being dropped.
I'll try that hack thanks. I would need a way to get console display 
back when streaming stops though.

------ Original Message ------
From: "Nicolas Dufresne" <nicolas at ndufresne.ca>
To: "Daniel Rossi" <electroteque at gmail.com>
Cc: "Discussion of the development of and with GStreamer" 
<gstreamer-devel at lists.freedesktop.org>
Sent: 10/11/2019 1:35:51 AM
Subject: Re: Re[2]: Playbin + kmssink + aspect ratio black borders

>Le jeudi 10 octobre 2019 à 11:47 +0000, Daniel Rossi a écrit :
>>  Thanks mate. Some of it went over my head regards to fbcon. How do I disable that ? I don't know what modetest is. Is this something I should take up with RPI forum ?
>
>modetest is missing on raspbian (drm-utils is missing), sorry didn't
>catch you are on RPi. One way I found is to unbind all consoles:
>
>   for i in  /sys/class/vtconsole/*; do echo 0 > $i/bind; done
>
>For me it turns the VT blank, no blinking or anything. And then kmssink
>seems to do the right thing.
>
>>
>>  This setting force-modesetting seems to use the original underlying layer for display, or tries to. I'll test it and report back.
>>
>>  I tried "add-borders" with videoscale and didn't seem to work ?
>>
>>https://gstreamer.freedesktop.org/documentation/videoscale/index.html?gi-language=c
>>
>>
>>
>>  ------ Original Message ------
>>  From: "Nicolas Dufresne" <nicolas at ndufresne.ca>
>>  To: "Daniel Rossi" <electroteque at gmail.com>
>>  Cc: "Discussion of the development of and with GStreamer" <gstreamer-devel at lists.freedesktop.org>
>>  Sent: 10/10/2019 9:45:31 PM
>>  Subject: Re: Playbin + kmssink + aspect ratio black borders
>>
>>  >
>>  > Le jeu. 10 oct. 2019 04 h 56, Daniel Rossi <electroteque at gmail.com> a écrit :
>>  > > I am using kmssink to output video to HDMI on RPI. However, the video is overlaying the console text, with the text showing underneath it depending on the video scale.
>>  > >
>>  > > In 16:9 on a TV it still shows text top and bottom but not on my monitor. In 4:3 it's apparantly forcing aspect ratio, and the console text is displaying underneath it .
>>  > >
>>  > > Is there a way to force a black border using playbin ?
>>  >
>>  > By default, kmsink will render on an overlay, leaving fbcon frame buffer in place. To add black border without loosing the speed of zero copy, kmssink would need to learn to render on multiple planes, and for that it would need to use the new atomic kernel API. We basically need to implement a small compositor to go further with that.
>>  >
>>  > Meanwhile, you could disable fbcon, or try to set force-modesetting property (that does not always work though). I've heard of a patch adding a "fullscreen-overlay" property, but it was a bit of a hack.
>>  >
>>  > Final way, you could use modetest to replace fbcon framebuffer, but I don't know exactly how.
>>  >
>>  > > Example command
>>  > >
>>  > > gst-launch-1.0 playbin -v video-sink="kmssink" uri=srt://:8888
>>  > > _______________________________________________
>>  > > gstreamer-devel mailing list
>>  > > gstreamer-devel at lists.freedesktop.org
>>  > > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
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