RTSP payload change when dynamically adding new element

[Bilel Bghiel]

I changed the way I started elements in the pipeline after dynamically
adding them. The cameras don't give me random 96 payload message anymore.
Going further I'm still not getting a grip on adding elements to the
playing pipeline. The RTSP cameras now give me a -5 data parse error.

The way I currently add the elements, while pipeline is running, is like
this:

- MainPipeline starts running. Every pipeline connects 9 already loaded
cameras to their own output tee. MainPipeline also connects the tee to a
Twitch RTMP, which works correct.

- UserPipeline waits for MainPipeline to fully go into PLAYING, then
creates another pipeline with all cameras connected. Like MainPipeline it
outputs through a tee, with an input-selector in between cameras and the
tee.
The tee is then connected to 3 VideoWriters, each of these take the
UserPipeline output and apply cropping, adds audio, textoverlay, encodes to
an mp4mux and then writes to MP4 file. (3 different formats purpose). After
connecting, all new added elements are set to PLAYING. Debugging doesn't
give me any practical error.

0:00:02.321593132 22380 0x7f4b4403f580 INFO                    task
gsttask.c:368:gst_task_func:<rtpjitterbuffer2:src> Task going to paused
0:00:02.321832107 22380 0x562328592460 WARN                 rtspsrc
gstrtspsrc.c:6252:gst_rtspsrc_loop:<source0> error: Internal data stream
error.
0:00:02.321890712 22380 0x562328592460 WARN                 rtspsrc
gstrtspsrc.c:6252:gst_rtspsrc_loop:<source0> error: streaming stopped,
reason error (-5)
0:00:02.321948739 22380 0x562328592460 INFO        GST_ERROR_SYSTEM
gstelement.c:2271:gst_element_message_full_with_details:<source0> posting
message: Internal data stream error.
0:00:02.322018227 22380 0x562328592460 INFO        GST_ERROR_SYSTEM
gstelement.c:2298:gst_element_message_full_with_details:<source0> posted
error message: Internal data stream error.
0:00:02.322147073 22380 0x562328592460 INFO                    task
gsttask.c:368:gst_task_func:<task1> Task going to paused
0:00:02.492679341 22380 0x7f4b44003de0 INFO               GST_EVENT
gstevent.c:892:gst_event_new_caps: creating caps event application/x-rtcp
0:00:02.492741557 22380 0x7f4b44003de0 INFO               GST_EVENT
gstevent.c:972:gst_event_new_segment: creating segment event time segment
start=0:00:00.000000000, offset=0:00:00.000000000, stop=99:99:99.999999999,
rate=1.000000, applied_rate=1.000000, flags=0x00, time=0:00:00.000000000,
base=0:00:00.000000000, position 0:00:00.000000000, duration
99:99:99.999999999
0:00:02.492772888 22380 0x7f4b44003de0 WARN                 default
gstrtspconnection.c:1362:writev_bytes: Operation was cancelled

Is there something I'm doing wrong?
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