GStreamer in Docker for Windows.

[Nicolas Dufresne]

Le lundi 07 décembre 2020 à 11:57 +0100, Andrés Meseguer Valenzuela a écrit :
> Dear all,
> I am trying to create a Linux image to execute containers with  
> gstreamer pipelines in Docker Desktop (for Windows).
> For example, using the following dockerfile:
> 
> FROM ubuntu:20.10
> 
> RUN apt-get update && \
>        apt-get -y install sudo
> 
> RUN useradd -m docker && echo "docker:docker" | chpasswd && adduser  
> docker sudo
> 
> CMD /bin/bash
> 
> RUN sudo -s apt-get update
> RUN apt-get install libgstreamer1.0-0 gstreamer1.0-plugins-base  
> gstreamer1.0-plugins-good gstreamer1.0-plugins-bad  
> gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-tools  
> gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3  
> gstreamer1.0-qt5 gstreamer1.0-pulseaudio -y
> 
> ENTRYPOINT gst-launch-1.0 v4l2src device=/dev/video0 !  
> 'video/x-raw,width=640,height=480,framerate=30/1' ! videoconvert !  
> ximagesink
> 
> USER docker
> 
> I try to display my webcam but the problem is that despite this image  
> builds, when I run it, the prompt returns this:
> 
> > docker run -it --net=host -e --privileged  -v  
> > /dev/video0:/dev/video0 fivecomm/webcam   
> > > $HOME/.Xauthority:/root/.Xauthority                                  
> >                                                                    
> > Setting pipeline to PAUSED ...                                        
> >                                                    ERROR: from  
> > element /GstPipeline:pipeline0/GstXImageSink:ximagesink0: Could not  
> > initialise X output                     Additional debug info:        
> >                                                                       
> >                       ../sys/ximage/ximagesink.c(867):  
> > gst_x_image_sink_xcontext_get ():  
> > /GstPipeline:pipeline0/GstXImageSink:ximagesink0:    Could not open  
> > display                                                               
> >                                     ERROR: pipeline doesn't want to  
> > preroll.                                                              
> >                    Failed to set pipeline to PAUSED.                  
> >                                                                       
> >  Setting pipeline to NULL ...                                         
> >                                                     Freeing pipeline  
> > ...

Assuming you have X running on the host, make sure to set DISPLAY environement
accordingly, and ensure that correct permissions are set. The X server may
requires you to expose a socket into your docker.

> 
> Hence, I would like to know how to display in Windows.
> Thanks for your time.
> 
> Regards,
> Andrés.
> 
> 
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