srtpdec gstsrtpdec.c:1262:gst_srtp_dec_chain:<srtpdec0> Invalid buffer, dropping
dtlssrtpdec gstdtlssrtpdec.c:412:on_decoder_request_key:<dtlssrtpdec0> no srtp key available yet
srtpdec gstsrtpdec.c:818:request_key_with_signal:<srtpdec0> Could not get caps for stream with SSRC 1356955624

Streaming side:
gst-launch-1.0 -e v4l2src device=/dev/video0 ! \
  video/x-raw,width=1280,height=720,framerate=30/1 ! \
  x264enc speed-preset=ultrafast tune=zerolatency  \
  byte-stream=true threads=4 key-int-max=15 intra-refresh = true ! \
  h264parse ! \
  rtph264pay ! \
  "application/x-rtp, payload=(int)96, ssrc=(uint)1356955624" ! \
  .rtp_sink_0 dtlssrtpenc connection-id=red is-client=true .src ! udpsink host=192.168.1.207 port=5000 \
  udpsrc port=5002 ! .sink dtlssrtpdec connection-id=red .rtp_src ! queue ! fakesink async=true \
  --gst-debug-level=3

Receiving side:
gst-launch-1.0 -e dtlssrtpenc connection-id=client is-client=false .src ! \
  udpsink host=192.168.1.250 port=5002 \
  udpsrc port=5000 caps="application/x-srtp, encoding-name=H264, payload=(int)96, ssrc=(uint)1356955624, roc=(uint)0" ! \
  .sink dtlssrtpdec connection-id=client .rtp_src ! rtph264depay ! \
  tee name = t \
  t. ! queue ! fakesink async=false \
  t. ! queue ! avdec_h264 ! autovideosink \
  --gst-debug-level=3