[gst-devel] Converting a gst-launch pipeline to C code

MSJ mauricio_sj at yahoo.com
Mon Oct 5 23:10:12 CEST 2009

Tim-Philipp Müller wrote:
> An async-done message just means that the pipeline has prerolled and
> data has made it through to all the sinks.
> No idea why things work if you remove either of those statements, but
> the easiest way to see what's happening is usually to follow the data:
> if a pipeline doesn't preroll, data doesn't make it to one of the sinks,
> so you should figure out where it doesn't get through. This (equivalent
> to gst-launch's -v switch) might provide some pointers in the right
> direction:
>     g_signal_connect (pipeline, "deep-notify",
>         G_CALLBACK (gst_object_default_deep_notify), NULL);

Thanks, I see at this point that my Video Sink is not responding in the
non-working case compared to the working scenario; although I haven't been
able to figure why.

Tim-Philipp Müller wrote:
> You might also consider adding the audio/video bin only in the callback
> when you get the pad you will link them to (don't forget to do
> gst_element_set_state(blabin,GST_STATE_PLAYING) then after you
> gst_bin_add()ed it).

No effect at all, the result is the same, i.e. individually video and audio
work but not together.

Tim-Philipp Müller wrote:
> Just to be sure: you know about gst_parse_launch() and
> gst_parse_bin_from_description(), right?
> Also, any reason you're not using uridecodebin or playbin2 here?
> Cheers
>  -Tim
Not sure about the first question.  I know that when using gst-launch I
don''t have any issues trying to do the same, is only when coding into C
that I have the issue.
WRT to the second question, I was trying to follow the tutorial, and I am
not sure if I can specify my own codecs for this elements or not.

Thanks for the qnswers.

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