dynamic live source and linear muxed output stream

[Edouard Dupin]

Hello,

We have a dynamic live source that can change the type of stream (mpegts 
to ???) and we need to keep a static output (constant framerate, and 
specific size)
Note that our output is a http sink.

After the first start the pipeline seems like:
gst-launch-1.0 filesrc location=input_01.ts ! queue ! decodebin 
name=decoder ! queue ! videoconvert name=videostream  ! videoscale ! 
videorate  ! capsfilter caps=video/x-raw,width=640,height=480 ! x264enc 
! mpegtsmux name=outputmuxer ! filesink location=output_plop.ts 
sync=true decoder. ! queue ! audioconvert name=audiostream ! 
audioresample ! capsfilter 
caps=audio/x-raw,format=S16LE,rate=48000,channels=2,layout=interleaved ! 
twolamemp2enc ! outputmuxer.

Our problem is simple
When we detect the input change we remove "filesrc location=input_01.ts 
! queue ! decodebin name=decoder", And we create a new source and 
decoder of the pipeline.
The muxer generate the followings warnings :
0:00:08.405527100 32432 0x7fe8a80d46d0 WARN mpegtsmux 
mpegtsmux.c:1010:mpegtsmux_clip_inc_running_time:<outputmuxer:sink_66> 
ignoring DTS going backward
0:00:08.405622170 32432 0x7fe8a80d46d0 WARN mpegtsmux 
mpegtsmux.c:1010:mpegtsmux_clip_inc_running_time:<outputmuxer:sink_66> 
ignoring DTS going backward

==> and no output is generate after input change.

We have tried some solution, but we request your opinion about our choice.

Our tested solution:
- Re-timestamp the buffer "PTS" just after push out of the decoder and 
send modified segment->position to the current push time (linear 
timestamp from the starting of the pipeline) to the muxer ==> but it 
does not seams to be a good solution.
- An other way could be to modify the muxer to manage change input 
segment to generate continuous output.

If you think of a cleaner way to do this, your input would be greatly 
appreciated.
Thanks