appsrc and GMainloop problem

[Deepak Jain]

Hi Tim,

OK....I am pushing video elementary data from video thread to the appsrc.

My pipeline is like

appsrc->h264parse->ffdec_h264->ffmpegcolorspace->videoscale->autovideosink

Now as I can see, video is properly pushed to appsrc, then to h264parse but
no data can be found after ffdec_h264 and nothing happens


This I checked by putting filesink first after appsrc, then after
h264parse. Both times, I get the data properly

But when I put filesink after ffdec_h264, my file shows o bytes.

Any idea what I may be missing?

On Thu, Aug 22, 2013 at 3:42 AM, Tim-Philipp Müller <t.i.m at zen.co.uk> wrote:

> On Wed, 2013-08-21 at 19:38 +0530, Deepak Jain wrote:
>
> Hi,
>
> > I am having a audio/video application providing interfaces for audio
> > video playback.
> >
> > I am using GStreamer framework for actual playback.
> >
> > In my application, I get elementary streams from the network(demuxed
> > streams).
> >
> > Elementary Audio and Video in separate threads.
> >
> >
> > Now there is problem when I create pipeline and use appsrc.
> >
> > I am creating pipeline for video elementary stream as:
> >
> >
> >
> appsrc->h264parse->ffdec_h264->ffmpegcolorconverter->videoconvert->xvimagesink
> >
> >
> > My class is C++ and I am creating and doing gst_init in my class
> > function like:
> >
> >     gst_init (NULL, NULL);
> >
> >
> >     loop = g_main_loop_new (NULL, TRUE);
> >
> >
> >  /* creating pipeline here */
> > --------------
> > ---------------
> > --------------
> >
> >     /* go to playing and wait in a mainloop. */
> >     gst_element_set_state (playbin, GST_STATE_PLAYING);
> >
> >
> >
> > Now if I use g_main_loop_run (loop); after setting the pipeline to
> > play state above, my code don’t work. My audio and video threads(which
> > are bringing audio video elementary data) don't work at all.
> >
> >
> > if I call g_main_loop_run (loop); after getting first video packet,
> > the idle handler callback works too fast then my feeding thread due to
> > which same data gets pushed to app_src repeatedly and therefore the
> > pipeline fails.
> >
> >
> > The problem to me seems to be where to call g_main_loop_run (loop);
>
> You are aware that g_main_loop_run() blocks, until you quit it, right?
>
> It's not quite clear to me why you are using a main loop in the first
> place. If you get your data in separate threads, you can just push them
> into the respective appsrc from those threads.
>
> GStreamer's streaming threads operate with or without a main loop and
> are not affected by any main loops running in the application thread.
>
>
> > Also since my code is c++ and gstreamer is C, is that can be a issue?
>
> No.
>
> Not sure what's going on, and it's hard to help without seeing all the
> relevant code and how it works together.
>
> Cheers
>  -Tim
>
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