Make gstreamer render even when there is no video streaming

[Wizardy]

Hi,

Thanks for taking the time to reply. The first option is impossible at this
moment, as everything relies on gstreamer+cairo and doing it outside means
having to start nearly from scratch.

I've been looking at intervideosink as you suggested, but I don't have that
plugin (I'm using gstreamer 1.4.0 under windows), and couldn't find enough
documentation. Could your point me to some documentation or examples?

Thanks

On Thu, Sep 18, 2014 at 7:47 PM, Tim Müller <tim at centricular.com> wrote:

> On Thu, 2014-09-18 at 19:10 +0200, Wizardy wrote:
>
> Hi,
>
> > I'm developing a client application where I use gstreamer to get a
> > video streaming from another device and display it along with some
> > extra information (text and images). To render all the information
> > over the video I'm using the cairo plugin included with gstreamer
> > which works great. The problem I'm having is the video streaming is
> > not always available, and when it isn't gstreamer doesn't render
> > anything, so all my extra information isn't shown either.
> >
> > A simplified version of my pipeline:
> >
> > udpsrc port=5000 ! application/x-rtp, payload=96 ! rtph264depay !
> > avdec_h264 ! videoconvert ! cairooverlay ! videoconvert ! d3dvideosink
> >
> > Does someone know how can I make gstreamer render cairo even when
> > there is no video?
>
> I think you broadly have two options:
>
> 1) do the overlaying outside of GStreamer using your graphics system
>
> 2) you could do something like:
>
>   udpsrc ! ... ! dec ! intervideosink
>
>   intervideosrc ! cairooverlay ! videoconvert ! d3dvideosink
>
> and intervideosrc will continue to output the last buffer or (after a
> while without signal) a black buffer
>
>  Cheers
>   -Tim
>
>
> --
> Tim Müller, Centricular Ltd - http://www.centricular.com
>
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>
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