How to play two different videos in two different displays simultaneously using gstreamer?

[Daniel Rossi]

I also asked about RPI playbin pipelines and what the appropriate sink 
to use for HDMI output via a headless python script. The script runs on 
startup via systemd.

So will it auto select hardware h264 decoding and I have to use kmssink 
for HDMI output ? I'm not loading in XWindows. To work headless in 
systemd I had to set the DISPLAY env in the systemd config. This gave me 
a temporary Xwindow output.



------ Original Message ------
From: "Nicolas Dufresne" <nicolas at ndufresne.ca>
To: "Discussion of the development of and with GStreamer" 
<gstreamer-devel at lists.freedesktop.org>
Sent: 9/12/2019 10:50:44 PM
Subject: Re: How to play two different videos in two different displays 
simultaneously using gstreamer?

>Le jeudi 12 septembre 2019 à 06:56 -0500, NikhilMG a écrit :
>>  I am using
>>  1. Raspberry Pi 4 Model B which has 2 HDMI ports.
>>  2. Gstreamer-1.0
>>
>>  I have two videos saved in memory card. I want to drive two videos to two
>>  different HDMI port and play videos in two different Displays
>>  simultaneously. I would like to know the Gstreamer pipeline to access the
>>  HDMI-1 and HDMI-2 ports and also play two different videos in different
>>  displays simultaneously.
>>
>>  Here I am trying to drive video.mp4 to HDMI-2.
>>  */gst-launch-1.0 playbin3 videosink="mfw-v4lsink device=dev/video18"
>>  uri=file:///home/pi/Downloads/video.mp4/
>
>mfw-v4l2sink looks like one of Freescale plugin. The Raspberry Pi has
>stanard DRM drivers for the display. The easiest way is to start X11 or
>Wayland (weston), and then use the appropriate API to select the output
>to display on, this needs some programming of course.
>
>The alternative is to use kmssink, but that right now can only work if
>the two connectors can run on seperate CRTC, I don't know (and haven't
>tested yet) what is possible on the PI. I believe I can guide you on
>how to improve kmssink.
>
>>  *
>>  I even tried
>>  */gst-launch-1.0 playbin3 videosink="mfw-v4lsink device=HDMI-2"
>>  uri=file:///home/pi/Downloads/video.mp4
>>  / *
>>  and also tried
>>  */gst-launch-1.0 playbin3 videosink="mfw-v4lsink device=dev/HDMI-2"
>>  uri=file:///home/pi/Downloads/video.mp4
>>  /*
>>  I am not able to drive the video to HDMI-2 port. I expect the video to be
>>  played in HDMI-2, but the actual output is coming in HDMI-1 for all the
>>  above 3 given pipelines.
>>
>>
>>
>>
>>
>>  --
>>  Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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