[gst-devel] Any ways to add/remove branches to/from a running pipeline

[sledge hammer]

According to Aurelien's suggestion---> "Block your tee sink pad, link/unlink your preview branch, unblock."
This mean you should do "video source-->block-->tee" and not a "tee-->block-->preview bin/stream bin"


> Date: Tue, 13 Oct 2009 11:23:01 -0700
> From: shiping.li at gmail.com
> To: gstreamer-devel at lists.sourceforge.net
> Subject: Re: [gst-devel] Any ways to add/remove branches to/from a running pipeline
> 
> 
> Thanks Aurelien for your suggestion, and many thanks to all the answers
> posted here.  I really appreciated.  This makes me feel I am not alone,
> there are still many experts out there willing to provide help. :-)
> 
> I tried the method, and here are the results:
> 
> First let me put my pipeline here:
> 
> video source -> tee -> record bin
>                              -> preview bin
>                              -> stream bin
> 
> I tried to add preview bin when recode bin was running, first I blocked the
> tee->src to preview bin, BUT it stopped the whole pipeline, including record
> bin.  I tried several times, but could not figure out why, and no error
> messages printed out when I set debug level to 3.
> 
> Then I tried adding preview bin directly to running pipeline, it worked
> unexpectedly.  I do not know why it worked, it should not according the
> documents you pointed.  Removing preview bin from running pipeline was also
> working. 
> 
> Then when I tried to add stream bin, it became more difficult.  I tried many
> methods - blocking, unblocking, directly adding to running pipeline, etc. 
> None of them worked, and the most problems were like this:
> 
> <udpsink0> warning: Internal data flow problem.
> WARN     basesink gstbasesink.c:3279:gst_base_sink_chain_unlocked:<udpsink0>
> warning: Received buffer without a new-segment. Assuming timestamps start
> from 0.
> INFO        GST_ERROR_SYSTEM
> gstelement.c:1763:gst_element_message_full:<udpsink0> posting message:
> Internal data flow problem.
> INFO        GST_ERROR_SYSTEM
> gstelement.c:1786:gst_element_message_full:<udpsink0> posted warning
> message: Internal data flow problem.
> 
> So I am  technically stuck here for a couple of days now.
> 
> Could you guys please shad a light on me?
> 
> Many thanks
> 
> Shiping
> 
> 
> Aurelien Grimaud (elzz) wrote:
> > 
> > Le 07/10/2009 23:14, Shiping a écrit :
> >> Hi, there:
> >>
> >> I am trying to record live video, so a pipeline is setup to record video
> >> continuously.
> >>
> >> And during this process, I would like to preview the video from source. 
> >> So
> >> I add a tee to the recording pipeline and branch out for previewing. 
> >> When
> >> preview stopped, the branch was removed from the pipeline.
> >>
> >> I tried hard not to pause recording pipeline, but got all kinds of errors
> >> and unstable recording.  Currently all I can do is pause recording,
> >> inset/remove branch, and restart the whole pipeline.
> >>
> >> Of cause, I lost some frames in above process.
> >>
> >> My question is:  Is there a way to do it without pausing the recording?
> >>
> >> Any suggestions?
> >>
> >> Thanks
> >>
> >> Shiping
> >>    
> > Hi,
> > 
> > You should read 
> > http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-block.txt
> > Dynamically changing a PLAYING pipeline should be done with pad block to 
> > prevent any error.
> > Block your tee sink pad, link/unlink your preview branch, unblock.
> > 
> > Aurelien
> > 
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> 
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> 
> 
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