Changing source without stopping pipeline

[Stefan Sauer]

On 10/30/2011 03:40 AM, superlou wrote:
> I have a simplified test pipeline consisting of:
> v4l2src -> ffmpegcolorspace --> videoscale --> ximagesink
>
> I would like to detect a loss of signal from the v4lsrc (currently doing by
> waiting for the EOS signal, though the v42lsrc provides better warnings on
> camera disconnection if I can figure out how to get them).  For now, I'm
> trying to achieve the simpler case of simply switching the source element to
> a videotestsrc while the pipeline is playing.
>
> I've read the information about pad blocking
> (http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-block.txt),
> but it doesn't provide any indication on what to do for changing the source
> element.  I read that it may be possible to simply unlink the v4l2src,
> remove it, add the videotestsrc, and link it.  This sort of works in that
> eventually you see the videotestsrc, but it updates the output every few
> seconds (like a very slow stuttering).  If I stop and play, the output is
> smooth.
You might want to use "videotestsrc ! capsfilter" and set the format
that you use on v4l2src to videotestsrc.

Stefan
> I was wondering if anyone could point me towards an example or help me find
> the search terms to find the proper way to change out the source element on
> a playing pipeline.
>
> Thanks,
> Louis
>
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