[gst-devel] appsrc and appsink elements

[Gustavo Orrillo]

que estas tratando de hacer?

2009/1/4 Andres Colubri <andres.colubri at gmail.com>

> Hi,
>
> I've been struggling for a while with the appsrc element, and I wonder
> if anyone has any ideas about this. Basically, I'm trying to capture the
> contents of the screen into a video file. I'm not sure how to construct
> the pipeline to do it. I know that it has to start with an appsrc and
> end at a filesink, but I don't know how to initialize the appsrc (caps,
> max-bytes, etc) and what other intermediate elements are needed
> (encoders, demuxers). I looked at the examples that come with the source
> of appsrc, but these are for different scenarios (reading data from a
> file, streaming).
>
> Any help will be greatly appreciated.
>
> Thanks,
> Andres
>
>
> Jure Zitnik wrote:
> > Hi Andres,
> > The appsrc and appsink are not part of the binary gstreamer-plugins-bad
> > package on ubuntu 8.10 (reasoning is that they "still randomly change
> > API and ABI" :-)
> > But you can always build them from source:
> > apt-get source gstreamer0.10-plugins-bad
> > cd gst-plugins-bad0.10-0.10.5 (you might need to cange the version here)
> > ./configure
> > make
> >
> > After successful build, you can copy required shared libraries manually
> > (if you just need appsrc/appsink) as follows:
> > cp gst/app/.libs/libgstapp.so /usr/lib/gstreamer-0.10/
> > cp gst-libs/gst/app/.libs/libgstapp-0.10.so.0.0.0  /usr/local/lib
> > You might need to create additional symbolic links in /usr/local/lib
> > (both linking to libgstapp-0.10.so.0.0.0) : libgstapp-0.10.so.0 and
> > libgstapp-0.10.so
> >
> > Now use gst-inspect to see if everything works fine...
> >
> > Jure
> >
> > Andres Colubri wrote:
> >
> >> Hello,
> >>
> >> I have tried to use appsrc, but for some reason it doesn't seem to be
> >> recognized (I'm using gst-plugins-bad 0.10.8 on ubuntu 0.8.10) by
> >> gstreamer. For example, when I run the appsrc_ex example, I get an
> >> assertion error right after
> >> app->src = gst_element_factory_make("appsrc", NULL);
> >> so seems that app->src is null
> >>
> >> Also, gst-inspect doesn't find neither appsrc nor appsink.
> >>
> >> Thanks
> >> Andres
> >>
> >> Wim Taymans wrote:
> >>
> >>
> >>> On Wed, 2008-07-30 at 12:03 +0200, David SIORPAES wrote:
> >>>
> >>>
> >>>
> >>>> Hello,
> >>>>
> >>>> I would like to exchange buffers which are allocated and managed by an
> >>>> application of mine to and from a GStreamer pipeline.
> >>>>
> >>>> By reading the documentation it looks like the appsrc/appsink are the
> >>>> solution for me, but I am also reading here
> >>>>
> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-data-spoof.html
> >>>> that
> >>>>
> >>>> "New API is being developed at the moment to make data insertion and
> >>>> extraction less painful for applications. It can be found as GstAppSrc
> >>>> and GstAppSink in the gst-plugins-bad module. At the time of writing
> >>>> (October 2007), this API is not quite stable and ready yet, even
> though
> >>>> it may work fine for your purposes."
> >>>>
> >>>> So, may I ask whether it is safe to use such elements or not ? Or are
> >>>> there alternative solutions ?
> >>>>
> >>>>
> >>>>
> >>> The versionsof appsink/appsrc in the latest release of gst-plugins-bad
> >>> are full-featured and ready for consumption. See
> >>> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/examples/app/
> >>> for a whole bunch of examples of different use cases.
> >>>
> >>> Wim
> >>>
> >>>
> >>>
> >>>> Thanks,
> >>>>
> >>>> David S.
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
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