Dynamically changing the pipeline

[Alexander Binzberger]

Hi guys,
I am trying to change the pipeline dynamically but do not get it 
working. I also did not get splitmuxsrc working but that is a different 
story.

The general idea is recording a rtp live stream to disk and split it 
into files of some size or time. For this part splitmuxsink seems to 
work well.
|gst-launch-1.0 -e rtpbin udpsrc 
caps=||"application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264"||address=232.0.0.1 
port=5000 ! rtph264depay ! h264parse ! splitmuxsink 
location=~||/video||%02d.mp4 max-size-||time||=90000000000 
max-size-bytes=100000000
|The next step is playing it back (a bit like a DVR) as a playlist or 
chunks/files (as rtp again). This is where i struggle. My pipeline looks 
basically like this:
gst-launch-1.0 rtpbin name=rtpbin
     filesrc location=/home/user/video00.mp4 ! qtdemux ! h264parse ! 
rtph264pay ! capsfilter 'application/x-rtp,ssrc=(uint)1356955624' ! 
rtpbin.send_rtp_sink_0
                   rtpbin.send_rtp_src_0 ! udpsink port=5000
                   rtpbin.send_rtcp_src_0 ! udpsink port=5001 sync=false 
async=false
                   udpsrc port=5005 ! rtpbin.recv_rtcp_sink_0

(I was expecting splitmuxsrc to work in the reverse way but it did not 
somehow and the limitation to the pattern is not exactly what I need 
anyway.)
Then I was trying it with concat what works well but I want to add new 
files to the playlist dynamically and seek between them. So I was 
writing some code and trying to dynamically change the pipeline (like in 
the documentation page with the same name).
So first I tried to find a signal or event at the filesrc which tells me 
when I need to read the next element. I was expecting EOS for example 
but did not get it there.
Then I found out the EOS seems to get created by the demuxer and I tried 
to probe it there. In the blocking probe I tried to change the location 
of the filesrc but it complains then.
So I tried to change the state to null for the filesrc, change the 
location and set the state back to playing. Then I got errors about 
demux.sink was in push mode - which I do not understand. I also got 
errors telling me I am in the wrong thread for the change.
How can it be the wrong thread for me when the example does it in the 
same way and place?
However just to be sure I also tried two different filesrc elements and 
creating a new one but I end up with the same thing all the time.
I also tried a idle callback on the filesrc which did not kick in and a 
g_idle_add was also not working out for me.

What is the correct or best way to achieve this? What is my mistake here?

Thanks
Alex

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