Playbin + kmssink + aspect ratio black borders

[Daniel Rossi]

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 ?

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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