[gst-devel] How to let cheese switch between video mode and photo mode without interupting video

Jaap A. Haitsma jaap at haitsma.org
Sun Nov 25 18:02:20 CET 2007

On Nov 19, 2007 9:05 PM, Jaap A. Haitsma <jaap at haitsma.org> wrote:
> On Nov 19, 2007 8:56 PM, Stefan Kost <ensonic at hora-obscura.de> wrote:
> > Hi,
> >
> > Jaap A. Haitsma schrieb:
> > > Hi,
> > >
> > > I guess some of you are familiar with the cheese webcam program [1]
> > > Cheese used to have two pipelines (one for taking a picture and one
> > > for recording a video). We refactored that code and made one pipeline
> > > to which we connect a photo_bin or video encoding bin to the pipeline
> > > depending on if we are in video or photo mode.
> > >
> > > In order to do that we need to stop and start the pipeline. Therefore
> > > the video is interupted
> > >
> > > So what we would like is have 2 pipelines running.
> >
> > What about running one pipeline with a switch element. I haven't used it yet
> > myself. If that does not work using a tee and pad blocking could also work.
> >
> Thanks, I was looking for such a switch element. Probably because the
> name is so logical I overlooked it :-(
> I'll give it a try
I tried it. switch is unfortunately not the element I was looking for.
It switches inputs not outputs like I need. I tried the suggestion of
blocking pads but if I block one element in one branch of the tee the
other one also stops. See attached example:

The example use videotestsrc which is tee'd to two imagesinks by
pressing the sink1 button you can block /unblock the first sink

However if the first sink gets blocked also the second one gets
blocked. So that doesn't really help me. Is there anything I do wrong?
Should I try something else?


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