RTSP/SRTP in gstreamer (MIKEY vrl2rtspserver)

[Manikandan Valaguru]

Hi,
I am currently working with a custom v4l2rtspserver built on Live555, aiming to enable RTSPS (RTSP over TLS) and SRTP (Secure RTP) for secure video streaming. My objective is to stream encrypted video and successfully decode it in GStreamer.

Based on my understanding:

    RTSPS encryption and decryption rely on TLS certificates.

    SRTP requires a decryption key, which can be extracted from the MIKEY data in the SDP (Session Description Protocol) of the RTSP response.

    Using this key, I need to construct a GStreamer pipeline to decrypt SRTP packets.

Could you confirm if this approach is correct?

Currently, I am extracting the SRTP key from the SDP session and embedding it into the GStreamer pipeline as follows:

GST_DEBUG=3 gst-launch-1.0 rtspsrc location=rtsps://econ:econ@192.168.1.23:5005/routecam tls-validation-flags=4 protocols=udp \
    ! application/x-srtp, srtp-key=a053ace0edcaba09192bff35fa01da6170317cd36af12b87be015f416701, \
      srtp-cipher=aes-128-icm, srtp-auth=hmac-sha1-80, roc=0 \
    ! srtpdec \
    ! rtph264depay \
    ! avdec_h264 \
    ! xvimagesink -v

However, I am encountering issues during playback. I have attached the error logs and MIKEY data for reference. Could you please review them and let me know if I am missing anything?

Looking forward to your insights.

Regards,
Manikandan
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