v4l2src io-mode=4 and waylandsink rendering issue

[Matteo Valdina]

Sure,
I have an application that runs two GStreamer pipeline that looks something
like that:
Pipeline 1:
v4l2src io-mode=4 device=/dev/video0 ! waylandsink
Pipeline 2:
v4l2src io-mode=4 device=/dev/video1 ! waylandsink

When both use DMAbuf (io-mode=4) the two waylandsink show both cameras.
To better describing:
You see when both are running on the two waylandsink the same content from
one of the camera and flicker between these two cameras.

I work around that forcing one of the camera in io-mode=2 (mmap).

Best
Matteo

On Thu, Aug 2, 2018 at 10:44 AM Nicolas Dufresne <nicolas at ndufresne.ca>
wrote:

> Le jeudi 02 août 2018 à 07:48 -0500, Matteo Valdina a écrit :
> > Hi,
> > I'm using two separate pipeline in the same process where the input
> > is a v4l2src and DMAbuf.
> > The input feed is different but when I render with the waylandsink
> > the two pipelines content is mixed. Both display the same content and
> > flicker between the two contents.
>
> This isn't very clear what you are doing. You should clarify.
>
> >
> >  It looks like using DMA pool is shared across these two pipelines.
> >
> > I pass the wl_display and wl_surface to the waylandsink and I also
> > tried to pass two different wl_display but it doesn't make any
> > difference.
> >
> > Changing io-mode=4 (dmabuf) to something else (2 mmap) solved the
> > issue.
> >
> > Any suggestions?
>
> Do you multi-plex the camera to multiple waylandsink element ?
>
> >
> > Best
> > Matteo Valdina
> > --
> > “There are two ways of constructing a software design: One way is to
> > make it so simple that there are obviously no deficiencies, and the
> > other way is to make it so complicated that there are no obvious
> > deficiencies. The first method is far more difficult.”
> > - Tony Hoare
> > _______________________________________________
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-- 
“There are two ways of constructing a software design: One way is to make
it so simple that there are obviously no deficiencies, and the other way is
to make it so complicated that there are no obvious deficiencies. The first
method is far more difficult.”
- Tony Hoare
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