Bidirectional rtpbin audio transcoding

[Okrslar Ales]

Hello !

We're strugling using rtpbin (two of them) in a bidirectional server side audio transcoding pipeline: (simplified here)

   udpsrc  -> rtpbin_1  -> rtpdepay_x -> decode_x  -> encode_y -> rtppay_y    -> rtpbin_2 -> udpsink
   udpsink <- rtpbin_1 <- rtppay_x     <- encode_x  <- decode_y <- rtpdepay_y <- rtpbin_2 <- udpsrc

This is all encapsulated in a single pipeline. When the pipeline receives incoming RTP stream, a warning appears:
GStreamer-WARNING **: loop detected in the graph of bin 'transcoding_pipeline_0'!!

The pipeline works as expected, but when we try to tear it down, starting by setting it to NULL state, the driving thread dead-locks on a gstreamer mutex.
Do we follow a valid approach to the transcoding of audio RTP  ? Thanks!
Regards, Ales


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