Multiple Source Pipeline Hangs

[johnwesting]

I placed queues, queue2s, and multiqueues in every place the pipeline would
allow. I guess there's no hope for starting both sources in parallel using
gst-launch?


On Tue, May 7, 2013 at 11:07 AM, Tim-Philipp Müller-2 [via GStreamer-devel]
<ml-node+s966125n4659821h8 at n4.nabble.com> wrote:

> On Tue, 2013-05-07 at 07:09 -0700, johnwesting wrote:
>
> > I'm not sure where I got this from but I thought with GStreamer
> > versions 0.8 is less than 0.10, does that mean the threading feature
> > was removed from newer versions? Why?
> >
> >
> > If I don't have the option of creating threads using the {} brackets
> > then how can I spawn additional threads using gst-launch? I tried
> > placing queues everywhere I could in the pipeline but this still did
> > not solve the problem.
>
> In 0.10 and 1.0 you can force the creation of a new streaming thread by
> inserting a queue (or multiqueue) element into the pipeline.
>
> In 0.8 scheduling (when data would flow between which pads) worked
> completely differently, there were dedicated schedulers which would try
> to figure out which pads needed attention etc. In 0.10/1.0 we leave this
> kind of scheduling mostly to the kernel.
>
>  Cheers
>   -Tim
>
> >
> > On Tue, May 7, 2013 at 6:18 AM, Tim-Philipp Müller-2 [via
> > GStreamer-devel] <[hidden email]> wrote:
> >         On Tue, 2013-05-07 at 08:50 +0100, David Röthlisberger wrote:
> >
> >         > On 6 May 2013, at 21:50, John Westing wrote:
> >         > >
> >         > > I read the article and understand that the problem is
> >         likely an issue with threading, hence the reason for the {}
> >         brackets described in my first post: {} brackets in a
> >         gst-launch pipeline spawn an additional thread for the
> >         elements surrounded in the brackets. However, in my case when
> >         I use the {} brackets I get the GStreamer warning "Error
> >         during parsing: syntax error, unexpected $undefined" as
> >         described in my first post.
> >         >
> >         > Interesting, I didn't know that! Where is this documented? A
> >         Google
> >         > search for "gst-launch brackets thread" returns this man
> >         page:
> >         > http://linux.about.com/library/cmd/blcmdl1_gst-launch.htm
> >         >
> >         > which says:
> >         >
> >         >     A group of elements surrounded by curly braces {, } will
> >         be executed
> >         >     in a separate thread.
> >         >
> >         > However, it isn't clear what version of GStreamer the above
> >         corresponds
> >         > to. On my Ubuntu 12.10 system, neither the man page for
> >         gst-launch-0.10
> >         > nor gst-launch-1.0 contain this text (nor any mention of
> >         "{").
> >         That { } syntax for a new thread is GStreamer 0.8 syntax. It
> >         doesn't do
> >         anything in 0.10.x or 1.x. It's probably best to ignore every
> >         document
> >         where you find these in a gst-launch context.
> >
> >         Cheers
> >          -Tim
> >
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