Regarding srtpenc and srtpdec in gstreamer

[Hau Lam]

I knew that srtpenc and srtpdec using the libsrtp but currenltly libsrtp
having a bug related Rollover Counter
https://github.com/Kurento/bugtracker/issues/587.
If the ROC not in sync between Sender and Reciveier, it will cause srtpdec
authenticate failed.
-----
Example I have 2 pipelines

1/ Sender
gst-launch-1.0 filesrc location = ./BigBuckBunny.h264 ! h264parse !
video/x-h264,stream-format=byte-stream,alignment=nal ! rtph264pay !
'application/x-rtp,payload=96,ssrc=(uint)1356955624' ! srtpenc
key="012345678901234567890123456789012345678901234567890123456789" !
udpsink host=127.0.0.1 port=5000

2/ Reciveier

gst-launch-1.0 udpsrc port=5000 caps='application/x-srtp, payload=(int)96,
ssrc=(uint)1356955624,
srtp-key=(buffer)012345678901234567890123456789012345678901234567890123456789,
srtp-cipher=(string)aes-128-icm, srtp-auth=(string)hmac-sha1-80,
srtcp-cipher=(string)aes-128-icm, srtcp-auth=(string)hmac-sha1-80' !
 srtpdec ! rtph264depay ! h264parse ! queue ! avdec_h264 ! xvimagesink
sync=false

---
The 2 above pipelines will work fine if Sender and Reciveier have the same
ROC.

But for any reason, if Sender and Reciver not start at the same time like :
1/ Sender start first and Rollover Counter incease from 0 to 1, 2.. And
then Reciver start later it doesn't know the current ROC of Sender then
authentication will fail
2/ Sender is crashed and ROC is started  again from 0 it also cause un-sync
ROC between Sender and Receiver.

So could Gstreamer team suggest how to deal with the un-sync ROC issue
between Sender and Receiver ?
Thank you very much

Best regards,
Hau Lam
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