v4l2 element stay in READY state

[Russell]

Hi, Wonchul

How can I confirm whether v4l2sink receives any buffer, are there any logs
that I can inspect?

Thanks,
Russell



On Wed, Feb 11, 2015 at 10:06 PM, Wonchul Lee <chul0812 at gmail.com> wrote:

> Hi,
>
> I guess that v4l2sink didn't receive any buffer.
> Sink element what inherited from basesink will change to PAUSED states
> after receiving a buffer for preroll.
>
>
> http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-states.txt#n41
>
>
> 2015-02-11 18:23 GMT+09:00 Sérgio Agostinho <sergio.r.agostinho at gmail.com
> >:
> > Hi Russel,
> >
> > If you do
> >
> > gst-launch-1.0 videotestsrc ! v4l2sink
> >
> > do you see video on your v4l2device? Also, if you do
> >
> > gst-launch-1.0 rtspsrc location=rtspaddress ! decodebin ! autovideosink
> >
> > Do you see your rtsp video stream playing on a window?
> >
> > Cheers
> >
> >
> > 2015-02-11 7:50 GMT+01:00 Russell <danrenjian at gmail.com>:
> >>
> >> Hi,
> >>
> >> I was trying this pipeline to feed rtsp stream into a v4l2 virtual
> >> loopback device:
> >> gst-launch-1.0 rtspsrc location=rtspaddress ! decodebin ! v4l2sink
> >>
> >> Terminal gave this output and stops, and there are no video in the v4l2
> >> device:
> >> Progress: (request) Sending PLAY request
> >> Progress: (request) Sending PLAY request
> >> Progress: (request) Sent PLAY request
> >>
> >>
> >> So I am implementing the pipeline in c to see what happened. decodebin
> and
> >> v4l2sink are added and linked on on pad-added event. Eventually I found
> the
> >> v4l2sink element stay in READY state while the other two are PLAYING. I
> have
> >> set v4l2sink to PLAYING asynchronously but the state does not change.
> >>
> >> What is the matter here? and where I can find any detailed reason why
> >> v4l2sink cannot go to PLAYING state?
> >>
> >> Thanks in advance.
> >>
> >> Sincerely,
> >> Russell
> >>
> >> _______________________________________________
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> >> gstreamer-devel at lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >>
> >
> >
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