Re: Matchbox desktop is active in background when playing videos

[Eric Nelson <eric.nelson@boundarydevices.com>]

Hi Ashwin,

First of /dev/video16 refers to the graphics layer (RGB or /dev/fb0),
and if you use that output, the desktop will be over-written.

The default /dev/video17 refers to the YUV overlay, and there's
currently nothing in the v4lsink element to set the overlay
parameters. We've patched this in the past to add color_key
and alpha properties, but gave up because they need continuous
maintenance with each Freescale release.

	http://boundarydevices.com/color-keying-with-freescale-g-streamer-video4linux-plugin/

If you wrap gstreamer with your own application, it's also
easy enough to add the ioctls into your own code.

Regards,


Eric

On 08/13/2013 09:50 PM, Ashwin Kirpalani wrote:
> No, export VSALPHA=1 didn't help. I also tried this on master branch and
> same thing happens. Also tried with the following command:
> gst-launch mfw_v4lsrc ! mfw_v4lsink
>
> and I still see the background desktio while the preview image is
> overlayed on top.
>
> But when I do this:
> gst-launch mfw_v4lsrc ! mfw_v4lsink device=/dev/video16
>
> the background desktop now goes away and I only see the camera stream,
> which is what I want.
>
> A side effect of this is when I ctrl+c the above command, the matchbox
> desktop does NOT come back and instead the last frame of the camera
> (i.e. a still image) is displayed on the desktop. I'd like to be able to
> go back to the desktop after previewing the camera.
>
>
>
> On Fri, Jul 12, 2013 at 9:59 AM, Fabio Estevam <festevam@gmail.com
> <mailto:festevam@gmail.com>> wrote:
>
>     On Fri, Jul 5, 2013 at 11:53 PM, Ashwin Kirpalani
>     <akcooper8@gmail.com <mailto:akcooper8@gmail.com>> wrote:
>      > I am using yocto dylan - poky release on sabrelite. When I play
>     videos using
>      > "gplay" or "gstreamer", the matchbox desktop remains in the
>     background. I
>      > can see it through the video...i.e. it is translucent. Is there a
>     way to
>      > avoid this? Thanks
>
>     Does "export VSALPHA=1" help?
>