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How can I catch the source of a message, sending one of my elements to the NULL state?

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wl2776

How can I catch the source of a message, sending one of my elements to the NULL state?

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I am manually building a pipeline.
One of its elements, a videosink, always falls the the NULL state.
My application doesn't send it there.

Several graphviz dumps, created during the pipeline contruction, and debug messages from a bus watch, show that it changes states from READY to PAUSED, from PAUSED to READY, and then suddenly, from PLAYING to NULL.

My application doesn't send the pipeline neither to the playing nor to the NULL state by that moment.
I'd like to catch, who does this (and thoroughly punish it :) )

Tim-Philipp Müller-2

Re: How can I catch the source of a message, sending one of my elements to the NULL state?

On Tue, 2010-04-20 at 04:38 -0800, wl2776 wrote:

> I am manually building a pipeline.
> One of its elements, a videosink, always falls the the NULL state.
> My application doesn't send it there.
>
> Several graphviz dumps, created during the pipeline contruction, and debug
> messages from a bus watch, show that it changes states from READY to PAUSED,
> from PAUSED to READY, and then suddenly, from PLAYING to NULL.
>
> My application doesn't send the pipeline neither to the playing nor to the
> NULL state by that moment.
> I'd like to catch, who does this (and thoroughly punish it :) )

Run your code in gdb/your favourite debugger and set a breakpoint on
whatever_video_sink_change_state()? (and continue if it's an upward
state change, obviously)

Cheers
-Tim

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Zhao, Halley

Re: How can I catch the source of a message, sending one of my elements to the NULL state?

I met similar issue before, and add a queue before the sink could fix the issue.
I'm afraid the sink doesn't do "preroll" well lead to the issue.

-----Original Message-----
From: Tim-Philipp Müller [mailto:[hidden email]]
Sent: 2010年4月20日 21:07
To: [hidden email]
Subject: Re: [gst-devel] How can I catch the source of a message, sending one of my elements to the NULL state?

On Tue, 2010-04-20 at 04:38 -0800, wl2776 wrote: