Application Element interaction

[Yogesh Tyagi]

For some sparse streams, my video sink element fails to do prerolling
because there is too much audio data in the stream which stalls the demux
and the complete pipeline stuck .I am trying to notify the application when
first buffer is received on demux's video source pad, so that application
can lock video pad and change the state for audio, which will make room in
demux to process more data to complete the prerolling for video sink.

Do you see some other solution for this problem?

Thanks,
Yogesh


On Tue, May 13, 2014 at 5:28 PM, Thiago Santos
<ts.santos at sisa.samsung.com>wrote:

>  On 05/08/2014 11:30 PM, Yogesh Tyagi wrote:
>
>   If I add a probe to src pad of my element and emit a signal from this
> probe handler which will be received by the application.Upon receiving this
> signal, application is supposed to do state change of this element.
> Will it be a valid implementation? Does g_signal_emit or signal handler(in
> application) run in pipeline context?
>
> Can you describe what you are trying to do from high level? It would help
> coming up with a proper solution. Why do you need to change state when
> first buffer is received?
>
> And to answer your question, the signal emission happens from the thread
> that does it, so it would be done from a thread from the pipeline and it
> usually isn't safe to perform state changes from it.
>
>
>
>  Thanks,
> Yogesh
>
>
> On Fri, May 9, 2014 at 5:42 AM, Luis de Bethencourt <
> luis at debethencourt.com> wrote:
>
>> Hi Yogesh,
>>
>> You could use a gst_pad_add_probe () to be notified of the change you are
>> looking for in the element's video source pad.
>>
>>
>> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstPadProbeType
>>
>>  Hope this helps,
>> Luis
>>
>>
>>  On 8 May 2014 14:18, Yogesh Tyagi <yogesh.bit2006 at gmail.com> wrote:
>>
>>>  I want to notify the application when first buffer is received on
>>> video source pad of my demux element.
>>>
>>>
>>>  Thanks,
>>> Yogesh
>>>
>>>
>>> On Thu, May 8, 2014 at 6:36 PM, Yogesh Tyagi <yogesh.bit2006 at gmail.com>wrote:
>>>
>>>> Hi,
>>>>
>>>>  What is best mechanism for application and element interaction in
>>>> gstreamer?
>>>>
>>>>  Thanks,
>>>> Yogesh
>>>>
>>>
>>>
>>>  _______________________________________________
>>> gstreamer-devel mailing list
>>> gstreamer-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
>
> _______________________________________________
> gstreamer-devel mailing listgstreamer-devel at lists.freedesktop.orghttp://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
>
> --
> Thiago Sousa Santos
> Senior Multimedia Engineer, Open Source Group
> Samsung Research America - Silicon Valley
>
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20140521/5d4eca75/attachment.html>