Hi experts 
!
I’ve implemented the following pipeline:
udpsrc → rtpbin → rtpg722depay → avdec_g722 → volume → avenc_g722 → rtpg722pay → udpsink
payloader and depayloader have both the property “source-info” set to true.
In this scenario the pipeline works as expected. I send a test RTP stream to the udpsrc and it is sent out by udpsink. In the wireshark trace I can see that the outbound RTP packets have the CSRC header set to the SSRC value of the inbound stgream.
Now if I extend the pipeline by an audiomixer as follows the stream is still forwarded but the CSRC headers are not present anymore in the outgoing packets:
udpsrc → rtpbin → rtpg722depay → avdec_g722 → volume → audiomixer → avenc_g722 → rtpg722pay → udpsink
So obviously the source-info gets lost in the audiomixer(?).
Is there a way to fix it?
Every hint would be greatly appreciated!